Segui questo link per vedere altri tipi di pubblicazioni sul tema: Pyrolysis.
Articoli di riviste sul tema "Pyrolysis"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 articoli di riviste per l'attività di ricerca sul tema "Pyrolysis".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi gli articoli di riviste di molte aree scientifiche e compila una bibliografia corretta.
1
Adeboye, B. S., S. O. Obayopo, A. A. Asere e I. K. Okediran. "Production of Pyrolytic Oil from Cassava Peel Wastes". Journal of Solid Waste Technology and Management 47, n. 4 (1 novembre 2021): 726–31. http://dx.doi.org/10.5276/jswtm/2021.726.
Testo completoAbstract (sommario):
This study investigated the production of pyrolytic oil from cassava peel wastes. Pyrolysis is a very important thermochemical method for converting biomass into biofuel. In recent times, the production of biofuel has taken center stage due to concerns over the sustainability of conventional energy sources. Pyrolysis has received much attention by researchers because it can be used to optimize the production of high calorific value pyrolytic oil. A fixed bed pyrolysing unit was constructed for the production of liquid fuel in this study. Cassava peels were pyrolysed in the reactor. The temperature of reaction was varied to investigate the effect of temperature variation on the product distribution in terms of the percentage weight distribution and the calorific value of the pyrolytic oil. A maximum pyrolytic oil yield of 28.4 wt.% was obtained at 500 °C. The effect of temperature changes on calorific value was also investigated and it was observed that the maximum calorific value of 29.7 MJ/kg was obtained at 600°C.
2
ASSUMPÇÃO, Luiz Carlos Fonte Nova de, Mônica Regina da Costa MARQUES e Montserrat Motas CARBONELL. "CO-PYROLYSIS OF POLYPROPYLENE WITH PETROLEUM OF BACIA DE CAMPOS". Periódico Tchê Química 06, n. 11 (20 gennaio 2009): 23–30. http://dx.doi.org/10.52571/ptq.v6.n11.2009.24_periodico11_pgs_23_30.pdf.
Testo completoAbstract (sommario):
In this study, the process of co-pyrolysis of polypropylene (PP) residues with gas-oil was evaluated, varying the temperature and the amount of polypropylene fed to the reactor. The polypropylene samples and gas-oil were submitted to the thermal co-pyrolysis in an inert atmosphere, varying the temperature and the amount of PP. The influence of the gas-oil was evaluated carrying the co-pyrolysis in the absence of PP. The pyrolysed liquids produced by this thermal treatment were characterized by modified gaseous chromatography in order to evaluate the yield in the range of distillation of diesel. As a result, the increase of PP amount lead to a reduction in the yield of the pyrolytic liquid and to an increase of the amount of solid generated. The effect of temperature increase showed an inverse result. The results show that plastic residue co-pyrolysys is a potential method for chemical recycling of plastic products.
3
Urbanovičs, Igors, Gaļina Dobele, Vilhelmīne Jurkjane, Valdis Kampars e Ēriks Samulis. "PYROLYTIC OIL - A PRODUCT OF FAST PYROLYSIS OF WOOD RESIDUES FOR ENERGY RESOURCES". Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (23 giugno 2007): 16. http://dx.doi.org/10.17770/etr2007vol1.1742.
Testo completoAbstract (sommario):
The application of renewable energy resources for energy production becomes increasingly urgent worldwide. Fast pyrolysis is one of the trends of obtaining liquid fuel from solid biomass.The aim of the present study was to investigate the yield, chemical composition, physical properties and water amount of hardwood pyrolytic oil (PO) depending on the pyrolysis and pre-treatment conditions in an ablative type reactor.The results of the analysis of the heat capacity of pyrolytic oil show an increase in this parameter from 12 MJ/kg (without drying) to 15-16 MJ/kg, drying the wood, and then pyrolysing it.Pyrolytic oil with a decreased amount of pyrolytic water and a high heat capacity was obtained in an ablative type reactor, drying the wood and then pyrolysing it. For the pyrolytic oil obtained in the two-stage fast pyrolysis equipment process, pH increases.
4
Usino, David O., Päivi Ylitervo e Tobias Richards. "Primary Products from Fast Co-Pyrolysis of Palm Kernel Shell and Sawdust". Molecules 28, n. 19 (26 settembre 2023): 6809. http://dx.doi.org/10.3390/molecules28196809.
Testo completoAbstract (sommario):
Co-pyrolysis is one possible method to handle different biomass leftovers. The success of the implementation depends on several factors, of which the quality of the produced bio-oil is of the highest importance, together with the throughput and constraints of the feedstock. In this study, the fast co-pyrolysis of palm kernel shell (PKS) and woody biomass was conducted in a micro-pyrolyser connected to a Gas Chromatograph–Mass Spectrometer/Flame Ionisation Detector (GC–MS/FID) at 600 °C and 5 s. Different blend ratios were studied to reveal interactions on the primary products formed from the co-pyrolysis, specifically PKS and two woody biomasses. A comparison of the experimental and predicted yields showed that the co-pyrolysis of the binary blends in equal proportions, PKS with mahogany (MAH) or iroko (IRO) sawdust, resulted in a decrease in the relative yield of the phenols by 19%, while HAA was promoted by 43% for the PKS:IRO-1:1 pyrolysis blend, and the saccharides were strongly inhibited for the PKS:MAH-1:1 pyrolysis blend. However, no difference was observed in the yields for the different groups of compounds when the two woody biomasses (MAH:IRO-1:1) were co-pyrolysed. In contrast to the binary blend, the pyrolysis of the ternary blends showed that the yield of the saccharides was promoted to a large extent, while the acids were inhibited for the PKS:MAH:IRO-1:1:1 pyrolysis blend. However, the relative yield of the saccharides was inhibited to a large extent for the PKS:MAH:IRO-1:2:2 pyrolysis blend, while no major difference was observed in the yields across the different groups of compounds when PKS and the woody biomass were blended in equal amounts and pyrolysed (PKS:MAH:IRO-2:1:1). This study showed evidence of a synergistic interaction when co-pyrolysing different biomasses. It also shows that it is possible to enhance the production of a valuable group of compounds with the right biomass composition and blend ratio.
5
Mercl, Filip, Zdeněk Košnář, Lorenzo Pierdonà, Leidy Marcela Ulloa-Murillo, Jiřina Száková e Pavel Tlustoš. "Changes in availability of Ca, K, Mg, P and S in sewage sludge as affected by pyrolysis temperature". Plant, Soil and Environment 66, No. 4 (30 aprile 2020): 143–48. http://dx.doi.org/10.17221/605/2019-pse.
Testo completoAbstract (sommario):
Pyrolysis is a promising technology for sewage sludge (SS) treatment providing several improvements of SS properties for soil application. However, information on the influence of pyrolytic temperature on the availability of nutrients in resulting biochar (BC) is limited. In this study, anaerobically stabilised SS was pyrolysed in a laboratory fixed-bed reactor at 220, 320, 420, 520, and 620 °C for 30 min in the N<sub>2</sub> atmosphere. Pyrolysis resulted in a higher total content of all studied nutrients in BCs. Aromaticity and hydrophobicity of BCs increased with increasing temperatures while solubility decreased. Relative availability (% from total content) of nutrients in BCs was in order: Ca > Mg ~ K > S > P. Pyrolysis at 220 °C produced acidic BC with a higher content of acetic acid-extractable nutrients compared to non-pyrolysed control. An increment in pH and a significant drop in the content of available Ca, Mg, K and S were found at temperature 320 °C. Pyrolysis at 320 °C increased the content of available P by 28 % compared to non-pyrolysed SS. At the temperature of 420 °C and higher, available contents of all studied nutrients were lower than in non-pyrolysed SS.
6
Alagu, R. M., e E. Ganapathy Sundaram. "Experimental Studies on Thermal and Catalytic Slow Pyrolysis of Groundnut Shell to Pyrolytic Oil". Applied Mechanics and Materials 787 (agosto 2015): 67–71. http://dx.doi.org/10.4028/www.scientific.net/amm.787.67.
Testo completoAbstract (sommario):
Pyrolysis process in a fixed bed reactor was performed to derive pyrolytic oil from groundnut shell. Experiments were conducted with different operating parameters to establish optimum conditions with respect to maximum pyrolytic oil yield. Pyrolysis process was carried out without catalyst (thermal pyrolysis) and with catalyst (catalytic pyrolysis). The Kaolin is used as a catalyst for this study. The maximum pyrolytic oil yield (39%wt) was obtained at 450°C temperature for 1.18- 2.36 mm of particle size and heating rate of 60°C/min. The properties of pyrolytic oil obtained by thermal and catalytic pyrolysis were characterized through Fourier Transform Infrared Spectroscopy (FT-IR) and Gas Chromatography-Mass Spectrometry (GC-MS) techniques to identify the functional groups and chemical components present in the pyrolytic oil. The study found that catalytic pyrolysis produce more pyrolytic oil yield and improve the pH value, viscosity and calorific value of the pyrolytic oil as compared to thermal pyrolysis.
7
Lee, Nahyeon, Junghee Joo, Kun-Yi Andrew Lin e Jechan Lee. "Waste-to-Fuels: Pyrolysis of Low-Density Polyethylene Waste in the Presence of H-ZSM-11". Polymers 13, n. 8 (7 aprile 2021): 1198. http://dx.doi.org/10.3390/polym13081198.
Testo completoAbstract (sommario):
Herein, the pyrolysis of low-density polyethylene (LDPE) scrap in the presence of a H-ZSM-11 zeolite was conducted as an effort to valorize plastic waste to fuel-range chemicals. The LDPE-derived pyrolytic gas was composed of low-molecular-weight aliphatic hydrocarbons (e.g., methane, ethane, propane, ethylene, and propylene) and hydrogen. An increase in pyrolysis temperature led to increasing the gaseous hydrocarbon yields for the pyrolysis of LDPE. Using the H-ZSM-11 catalyst in the pyrolysis of LDPE greatly enhanced the content of propylene in the pyrolytic gas because of promoted dehydrogenation of propane formed during the pyrolysis. Apart from the light aliphatic hydrocarbons, jet fuel-, diesel-, and motor oil-range hydrocarbons were found in the pyrolytic liquid for the non-catalytic and catalytic pyrolysis. The change in pyrolysis temperature for the catalytic pyrolysis affected the hydrocarbon compositions of the pyrolytic liquid more materially than for the non-catalytic pyrolysis. This study experimentally showed that H-ZSM-11 can be effective at producing fuel-range hydrocarbons from LDPE waste through pyrolysis. The results would contribute to the development of waste valorization process via plastic upcycling.
8
Lu, Tao, Hao Ran Yuan, Shun Gui Zhou, Hong Yu Huang, Kobayashi Noriyuki e Yong Chen. "On the Pyrolysis of Sewage Sludge: The Influence of Pyrolysis Temperature on Biochar, Liquid and Gas Fractions". Advanced Materials Research 518-523 (maggio 2012): 3412–20. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3412.
Testo completoAbstract (sommario):
Pyrolytic conversion of sewage sludge to biochar, oil and gas is an environmentally and economically acceptable way comparable to conventional options for sewage sludge disposal. The aim of this paper is to investigate the influence of pyrolysis temperature on production of biochar fraction for agronomic application, oil and gas fractions for energy utilization. Sewage sludge samples collected from an urban sewage treatment plant were pyrolysed in a bench–scale quartz tubular furnace over the temperature range of 300-700°C.The results indicated that the biochar fraction yield decreased, the yields of liquid (oil and water) fraction and gas fraction increased by evaluating the pyrolysis temperature. Concentration of heavy metals and nutrient elements present in biochar varied with pyrolysis temperature, the heating value of oil from liquid fraction fluctuated between 26938.3 and 30757.9kJ/kg, the heating value of gas fraction increased from 4012kJ/Nm3 to 12077 kJ/Nm3 with the increasing pyrolysis temperature.
9
CARNEIRO, Débora da Silva, e Mônica Regina da Costa MARQUES. "CO-PYROLYSIS OF POLYETHYLENE S WASTE WITH BACIA DE CAMPOS'S GASOIL". Periódico Tchê Química 07, n. 13 (20 gennaio 2010): 16–21. http://dx.doi.org/10.52571/ptq.v7.n13.2010.17_periodico13_pgs_16_21.pdf.
Testo completoAbstract (sommario):
In this work the process of co-pyrolysis of polyethylene plastic residue was carried through with petroleum, in a temperature of 550°C. First, the polyethylene samples and petroleum had been submitted the thermal co-pyrolysis in inert atmosphere. Later they had been evaluated the efficiency of the process with variation of the amount of polyethylene residue added to the petroleum. The generated pyrolytic liquids had been characterized by modified gaseous chromatography, with the objective to evaluate the generation of fractions in the band of the distillation of diesel. It can be observed that the increase of the amount of PE in the half reactional favors the reduction of the income of pyrolytic liquid and the increase of the amount of generate solid. The results show that plastic residue co-pyrolysys is a potential method for chemical recycling of plastic products.
10
Kumar, Sachin, e R. K. Singh. "Thermolysis of High-Density Polyethylene to Petroleum Products". Journal of Petroleum Engineering 2013 (30 maggio 2013): 1–7. http://dx.doi.org/10.1155/2013/987568.
Testo completoAbstract (sommario):
Thermal degradation of plastic polymers is becoming an increasingly important method for the conversion of plastic materials into valuable chemicals and oil products. In this work, virgin high-density polyethylene (HDPE) was chosen as a material for pyrolysis. A simple pyrolysis reactor system has been used to pyrolyse virgin HDPE with an objective to optimize the liquid product yield at a temperature range of 400°C to 550°C. The chemical analysis of the HDPE pyrolytic oil showed the presence of functional groups such as alkanes, alkenes, alcohols, ethers, carboxylic acids, esters, and phenyl ring substitution bands. The composition of the pyrolytic oil was analyzed using GC-MS, and it was found that the main constituents were n-Octadecane, n-Heptadecane, 1-Pentadecene, Octadecane, Pentadecane, and 1-Nonadecene. The physical properties of the obtained pyrolytic oil were close to those of mixture of petroleum products.
11
Ramani, Balan, Arqam Anjum, Eddy Bramer, Wilma Dierkes, Anke Blume e Gerrit Brem. "Flash Pyrolysis of Waste Tires in an Entrained Flow Reactor—An Experimental Study". Polymers 16, n. 12 (20 giugno 2024): 1746. http://dx.doi.org/10.3390/polym16121746.
Testo completoAbstract (sommario):
In this study, a flash pyrolysis process is developed using an entrained flow reactor for recycling of waste tires. The flash pyrolysis system is tested for process stability and reproducibility of the products under similar operating conditions when operated continuously. The study is performed with two different feedstock materials, i.e., passenger car (PCT) and truck tire (TT) granulates, to understand the influence of feedstock on the yield and properties of the pyrolysis products. The different pyrolytic products i.e., pyrolytic carbon black (pCB), oil, and pyro-gas, are analyzed, and their key properties are discussed. The potential applications for the obtained pyrolytic products are discussed. Finally, a mass and energy balance analysis has been performed for the developed pyrolysis process. The study provides insight into the governing mechanisms of the flash pyrolysis process for waste tires, which is useful to optimize the process depending on the desired applications for the pyrolysis products, and also to scale up the pyrolysis process.
12
Sarkar, Aparna, Sudip De Sarkar, Michael Langanki e Ranjana Chowdhury. "Studies on Pyrolysis Kinetic of Newspaper Wastes in a Packed Bed Reactor: Experiments, Modeling, and Product Characterization". Journal of Energy 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/618940.
Testo completoAbstract (sommario):
Newspaper waste was pyrolysed in a 50 mm diameter and 640 mm long reactor placed in a packed bed pyrolyser from 573 K to 1173 K in nitrogen atmosphere to obtain char and pyro-oil. The newspaper sample was also pyrolysed in a thermogravimetric analyser (TGA) under the same experimental conditions. The pyrolysis rate of newspaper was observed to decelerate above 673 K. A deactivation model has been attempted to explain this behaviour. The parameters of kinetic model of the reactions have been determined in the temperature range under study. The kinetic rate constants of volatile and char have been determined in the temperature range under study. The activation energies 25.69 KJ/mol, 27.73 KJ/mol, 20.73 KJ/mol and preexponential factors 7.69 min−1, 8.09 min−1, 0.853 min−1of all products (solid reactant, volatile, and char) have been determined, respectively. A deactivation model for pyrolysis of newspaper has been developed under the present study. The char and pyro-oil obtained at different pyrolysis temperatures have been characterized. The FT-IR analyses of pyro-oil have been done. The higher heating values of both pyro-products have been determined.
13
Yang, Bin, e Ming Chen. "Influence of Interactions among Polymeric Components of Automobile Shredder Residue on the Pyrolysis Temperature and Characterization of Pyrolytic Products". Polymers 12, n. 8 (28 luglio 2020): 1682. http://dx.doi.org/10.3390/polym12081682.
Testo completoAbstract (sommario):
Pyrolysis and gasification have gradually become the main means to dispose of automobile shredder residue (ASR), since these methods can reduce the volume and quality of landfill with lower cost and energy recovery can be conducted simultaneously. As the ASR pyrolysis process is integrated, the results of pyrolysis reactions of organic components and the interaction among polymeric components can be clarified by co-pyrolysis thermogravimetric experiments. The results show that the decomposition mechanisms of textiles and foam are markedly changed by plastic in the co-pyrolysis process, but the effect is not large for rubber and leather. This effect is mainly reflected in the pyrolysis temperature and pyrolysis rate. The pyrolytic trend and conversion curve shape of the studied ASR can be predicted by the main polymeric components with a parallel superposition model. The pyrolytic product yields and characterizations of gaseous products were analyzed in laboratory-scale non-isothermal pyrolysis experiments at finished temperatures of 500 °C, 600 °C, and 700 °C. The results prove that the yields of pyrolytic gas products are determined by the thermal decomposition of organic substances in the ASR and final temperature.
14
Elkhalifa, Samar, Sabah Mariyam, Hamish R. Mackey, Tareq Al-Ansari, Gordon McKay e Prakash Parthasarathy. "Pyrolysis Valorization of Vegetable Wastes: Thermal, Kinetic, Thermodynamics, and Pyrogas Analyses". Energies 15, n. 17 (28 agosto 2022): 6277. http://dx.doi.org/10.3390/en15176277.
Testo completoAbstract (sommario):
In comparison to other methods, valorising food waste through pyrolysis appears to be the most promising because it is environmentally friendly, fast, and has a low infrastructure footprint. On the other hand, understanding the pyrolytic kinetic behaviour of feedstocks is critical to the design of pyrolysers. As a result, the pyrolytic degradation of some common kitchen vegetable waste, such as tomato, cucumber, carrot, and their blend, has been investigated in this study using a thermogravimetric analyser. The most prevalent model fitting method, Coats–Redfern, was used for the kinetic analysis, and the various mechanisms have been investigated. Some high-quality fitting mechanisms were identified and used to estimate the thermodynamic properties. As the generation of pyrolysis gases for chemical/energy production is important to the overall process applicability, TGA-coupled mass spectrometry was used to analyse the pyrogas for individual and blend samples. By comparing the devolatilization properties of the blend with single feedstocks, the presence of chemical interactions/synergistic effects between the vegetable samples in the blend was validated. The model, based on a first-order reaction mechanism, was found to be the best-fitting model for predicting the pyrolysis kinetics. The calculated thermodynamic properties (ΔH (enthalpy change ≈ E (activation energy))) demonstrated that pyrolysis of the chosen feedstocks is technically feasible. According to the TGA–MS analysis, blending had a considerable impact on the pyrogas, resulting in CO2 composition reductions of 17.10%, 9.11%, and 16.79%, respectively, in the cases of tomato, cucumber, and carrot. Overall, this study demonstrates the viability of the pyrolysis of kitchen vegetable waste as a waste management alternative, as well as an effective and sustainable source of pyrogas.
15
Wang, Xian-Hua, Han-Ping Chen, Xue-Jun Ding, Hai-Ping Yang, Shi-Hong Zhang e Ying-Qiang Shen. "Properties of gas and char from microwave pyrolysis of pine sawdust". BioResources 4, n. 3 (26 maggio 2009): 946–59. http://dx.doi.org/10.15376/biores.4.3.946-959.
Testo completoAbstract (sommario):
Pine sawdust pyrolysis was carried out respectively using microwave and conventional electrical heating at different temperatures in order to understand the properties of pyrolytic products from microwave pyrolysis of biomass. Less char material was obtained by microwave pyrolysis compared to conventional heating at the same temperature. While comparing the components of the pyrolytic gases, it was revealed that the microwave pyrolysis gas usually had higher H2 and CO contents and lower CH4 and CO2 contents than those obtained by conventional pyrolysis at the same temperature. The texture analysis results of the microwave pyrolysis chars showed that the chars would melt and the pores would shrink at high temperatures, and hence, the specific surface areas of the chars decreased with increasing temperature. Similarly, the reactivity of the char was remarkably reduced when the microwave pyrolysis temperature exceeded 600°C.
16
Joo, Junghee, Seonho Lee, Heeyoung Choi, Kun-Yi Andrew Lin e Jechan Lee. "Single-Use Disposable Waste Upcycling via Thermochemical Conversion Pathway". Polymers 13, n. 16 (6 agosto 2021): 2617. http://dx.doi.org/10.3390/polym13162617.
Testo completoAbstract (sommario):
Herein, the pyrolysis of two types of single-use disposable waste (single-use food containers and corrugated fiberboard) was investigated as an approach to cleanly dispose of municipal solid waste, including plastic waste. For the pyrolysis of single-use food containers or corrugated fiberboard, an increase in temperature tended to increase the yield of pyrolytic gas (i.e., non-condensable gases) and decrease the yield of pyrolytic liquid (i.e., a mixture of condensable compounds) and solid residue. The single-use food container-derived pyrolytic product was largely composed of hydrocarbons with a wide range of carbon numbers from C1 to C32, while the corrugated fiberboard-derived pyrolytic product was composed of a variety of chemical groups such as phenolic compounds, polycyclic aromatic compounds, and oxygenates involving alcohols, acids, aldehydes, ketones, acetates, and esters. Changes in the pyrolysis temperature from 500 °C to 900 °C had no significant effect on the selectivity toward each chemical group found in the pyrolytic liquid derived from either the single-use food containers or corrugated fiberboard. The co-pyrolysis of the single-use food containers and corrugated fiberboard led to 6 times higher hydrogen (H2) selectivity than the pyrolysis of the single-use food containers only. Furthermore, the co-pyrolysis did not form phenolic compounds or polycyclic aromatic compounds that are hazardous environmental pollutants (0% selectivity), indicating that the co-pyrolysis process is an eco-friendly method to treat single-use disposable waste.
17
Acosta, Rolando, Claudia Tavera, Paola Gauthier-Maradei e Debora Nabarlatz. "Production of Oil and Char by Intermediate Pyrolysis of Scrap Tyres: Influence on Yield and Product Characteristics". International Journal of Chemical Reactor Engineering 13, n. 2 (1 giugno 2015): 189–200. http://dx.doi.org/10.1515/ijcre-2014-0137.
Testo completoAbstract (sommario):
Abstract Scrap tyres represent a severe environmental problem that must be solved by developing technologies allowing the processing of high quantities of this residue. This work presents the results of pyrolysis oil and pyrolytic char production by intermediate pyrolysis of rubber recovered from scrap tyres. The influence of process variables such as particle size, temperature and reaction time on the characteristics of the products obtained was analysed. Maximal yields of 52.56 and 39.50 wt% of pyrolysis oil and pyrolytic char, respectively, were obtained, under operational conditions that favoured the production of pyrolysis oil. The products obtained were a pyrolytic char with a maximal surface area of 85.16 m2/g and fixed carbon content of 78.55 wt%; and pyrolysis oil with a higher heating value of 42.94 MJ/kg, real density of 0.948 g/mL, viscosity 2.29×10−3 Pa s and acidity between 0.39 and 1.57 mg KOH/g. The highest total aromatics (benzene, toluene, xylenes and ethylbenzene) yield in pyrolysis oil was obtained at a temperature of 466°C and volumetric gas flow of 155 NmL/min. In addition, at these conditions, the pyrolysis oil having the maximum aromatic yield showed the lowest acidity. Nevertheless, it was observed that the highest pyrolysis oil yield does not necessarily lead to a higher yield of aromatics.
18
Li, Chao, Zhaoying Yang, Xinge Wu, Shuai Shao, Xiangying Meng e Gaowu Qin. "Reactive Molecular Dynamics Simulations of Polystyrene Pyrolysis". International Journal of Molecular Sciences 24, n. 22 (16 novembre 2023): 16403. http://dx.doi.org/10.3390/ijms242216403.
Testo completoAbstract (sommario):
Polymers’ controlled pyrolysis is an economical and environmentally friendly solution to prepare activated carbon. However, due to the experimental difficulty in measuring the dependence between microstructure and pyrolysis parameters at high temperatures, the unknown pyrolysis mechanism hinders access to the target products with desirable morphologies and performances. In this study, we investigate the pyrolysis process of polystyrene (PS) under different heating rates and temperatures employing reactive molecular dynamics (ReaxFF-MD) simulations. A clear profile of the generation of pyrolysis products determined by the temperature and heating rate is constructed. It is found that the heating rate affects the type and amount of pyrolysis intermediates and their timing, and that low-rate heating helps yield more diverse pyrolysis intermediates. While the temperature affects the pyrolytic structure of the final equilibrium products, either too low or too high a target temperature is detrimental to generating large areas of the graphitized structure. The reduced time plots (RTPs) with simulation results predict a PS pyrolytic activation energy of 159.74 kJ/mol. The established theoretical evolution process matches experiments well, thus, contributing to preparing target activated carbons by referring to the regulatory mechanism of pyrolytic microstructure.
19
Lucas, E. B., O. E. Itabiyi e O. O. Ogunleye. "Optimization of Products Yields from the Pyrolysis of Palm Kernel Shells Using Response Surface Methodology". Applied Mechanics and Materials 575 (giugno 2014): 13–16. http://dx.doi.org/10.4028/www.scientific.net/amm.575.13.
Testo completoAbstract (sommario):
This work focussed on the optimisation of product yields from the pyrolysis of palm kernel shells (PKS). 479g of dried PKS were loaded into the retort and then placed inside the furnace chamber and this was pyrolysed at 300, 400, 500, 600 and 700°C. The pyrolysis products obtained are char, tar (pyro oil and pyroligneous acid) and gas. A full factorial design (FFD) consisting two factors (Temperature and duration of pyrolysis) at three level was used to study the pattern of product yields from the pyrolysis of PKS. Char, tar and gas were evaluated as the responses. Thirteen experimental runs resulted from the FFD with a minimum product yield of 0.9wt% and maximum product yield of 99wt%. Response surface methodology was used to analyse the results of the FFD of the product yields of PKS. The optimum conversion yields expressed as a percentage of oven-dried weight of palm kernel shells of char, tar and gas products at their respective pyrolysing temperatures were 99wt% char at 304°C, 35wt% tar at 700°C and 39% gas at 700°C. The duration for the pyrolysis process was 20mins for 479g of dried palm kernel shells. The results of the work show that palm kernel shells can be readily pyrolised to obtain optimum yield of gas, tar (mixture of pyrolitic oil and pyroligneous acid) and char.
20
Djuric, Slavko, Sasa Brankov, Tijana Kosanic, Mirjana Ceranic e Branka Nakomcic-Smaragdakis. "The composition of gaseous products from corn stalk pyrolysis process". Thermal Science 18, n. 2 (2014): 533–42. http://dx.doi.org/10.2298/tsci120711021d.
Testo completoAbstract (sommario):
This paper describes experimental investigation of corn stalk pyrolysis. The mass of the sample (corn stalk) inside a pyrolytic reactor was 10 g with particle diameter of 5-10 mm. The sample in the reactor was heated in the temperature range of 24-650?C and the gas components generated during corn stalk pyrolysis were measured using gas analyzer G750 POLYTECTOR II. The sample mass before, during and after pyrolysis process was determined by using METTLER P1000 digital scale. Experimental results of the corn stalk pyrolysis indicate that as the temperature in the reactor increases from 300-650?C, the pyrolytic gas yield increases from 60-72%, while the char (coke) yield decreases from 40-28%. In the temperature range mentioned, the CO2 volume fraction in pyrolytic gas decreases, while the volume fraction of methane increases up to 39.5% followed with a constant decrease in the volume fraction of oxygen. The results obtained can represent starting basis for determining material and heat balance of pyrolysis process as well as corn stalk pyrolysis equipment.
21
Fonseca, Noyala, Roger Fréty e Emerson Andrade Sales. "Biogasoline Obtained Using Catalytic Pyrolysis of Desmodesmus sp. Microalgae: Comparison between Dry Biomass and n-Hexane Extract". Catalysts 12, n. 12 (25 novembre 2022): 1517. http://dx.doi.org/10.3390/catal12121517.
Testo completoAbstract (sommario):
The present work deals with the production of hydrocarbons in the C5–C12 range obtained from the fast micropyrolysis of a laboratory-grown Desmodesmus sp. microalgae. It compares the properties of this specific fraction of hydrocarbons using or not using transition alumina catalysts during pyrolysis in experiments with both pure dried microalgae and its n-hexane extract. The microalgae were characterised using thermogravimetry (TG) and CHN analysis; the n-hexane extract was analysed through Fourier transform infrared spectroscopy (FTIR). The pyrolysis experiments were performed in a multi-shot pyrolyser connected online with a gas chromatograph coupled to a mass spectrometer (GC/MS). The composition of the C5–C12 fraction was compared to that of an industrial pyrolysis gasoline. The results of pyrolysis at 600 °C show that the alumina catalyst increases the quantity of C5–C12 hydrocarbon families when compared to purely thermal pyrolysis, representing about 40% of all the dry microalgae pyrolysis products. In the case of n-hexane extract, the C5–C12 area fraction corresponds to 33.5% of the whole products’ area when pyrolysis is conducted with an alumina catalyst. A detailed analysis shows that linear molecules, mainly unsaturated, are predominant in the products. Dry biomass formed more aromatic but less cyclic and alkylated molecules in relation to the n-hexane extract. Nitrogen products, essentially alkylated pyrroles, were produced in large quantities when dry biomass was used but were below the detection limit when pyrolysing the extracts. Thus, the extraction with hexane proved to be an effective way to remove nitrogen compounds, which are undesirable in fuels. The estimated low heating values of the present C5–C12 pyrolysis hydrocarbon fractions (between 43 and 44 MJ/kg) are quite comparable to the reported values for reformulated and conventional industrial gasolines (42 and 43 MJ/kg, respectively).
22
Banciu, MD, RFC Brown, KJ Coulston, FW Eastwood, C. Jurss, I. Mavropoulos, M. Stanescu e UE Wiersum. "Formation of Cyclopent[hi]acephenanthrylene From 1,2-, 1,3-, 1,4- and 2,3-Triphenylenedicarboxylic Acid Derivatives on Flash Vacuum Pyrolysis at >900°C". Australian Journal of Chemistry 49, n. 9 (1996): 965. http://dx.doi.org/10.1071/ch9960965.
Testo completoAbstract (sommario):
The processes involved in the conversion of triphenylene , C18H12, into cyclopent [hi] acephenanthrylene, C18H10, under flash vacuum pyrolytic conditions at 900-1100°C have been investigated by pyrolysing triphenylene-1,2- and -2,3-dicarboxylic anhydrides and diallyl triphenylene-1,3- and -1,4-dicarboxylates to give the corresponding didehydrotriphenylenes in the gas phase. These didehydro intermediates are converted into mixtures of cyclopent [hi] acephenanthrylene and triphenylene in different yields and proportions. Pyrolysis of 9,10-diethynylphenanthrene. C18H10, yields cyclopent [hi] acephenanthrylene in good yield. Pyrolysis of 1-nitrotriphenylene and allyl triphenylene-2-carboxylate to give the triphenylen-1-yl and -2-yl radicals leads to formation of the same products. Mechanisms involving radical rearrangements (C18H11 species) and benzyne-cyclopentadienylidenecarbene and ethyne-ethenylidene rearrangements (C18H10 species) are discussed.
23
Mazlan, Mohammad Amir Firdaus, Yoshimitsu Uemura, Norridah Osman e Suzana Yusup. "Review on Pyrolysis of Hardwood Residue to Biofuel". Applied Mechanics and Materials 625 (settembre 2014): 714–17. http://dx.doi.org/10.4028/www.scientific.net/amm.625.714.
Testo completoAbstract (sommario):
In Malaysia, approximately 7 million tonne/year of rubber wood waste and 5 million tonne/year of acacia wood waste were generated in 2011. These hardwood residues could be utilized to produce biofuel through pyrolysis process. The aims of the paper are to study the fluidized bed pyrolysis system, determine the properties of pyrolytic bio-oil, and highlight the effect of biomass type, size and pyrolysis temperature on pyrolytic products distribution.
24
Liao, Hang Tao, Yang Zhang, Qiang Lu e Chang Qing Dong. "Analytical Fast Pyrolysis of Glucose, Cellubiose and Cellulose: Comparison of the Pyrolytic Product Distribution". Advanced Materials Research 805-806 (settembre 2013): 186–90. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.186.
Testo completoAbstract (sommario):
Analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was employed for the fast pyrolysis of glucose, cellubiose and cellulose in this study. The pyrolytic products from the three glucose-based materials were determined and compared to reveal the distribution differences. The results indicated that fast pyrolysis of the three materials obtained similar pyrolytic products, including the anhydrosugars, furans, linear carbonyls and cyclopentanones, but the distribution of the pyrolytic products differed from each other. The cellulose formed more anhydrosugars, but less carbonyls and furans than the glucose and cellubiose. The glycosidic bond of the cellubiose and cellulose would favor the pyrolytic depolymerization reactions to form various anhydrosugars, while inhibit the pyrolytic fragmentation reactions to produce linear carbonyls.
25
Kim, Soosan, Nahyeon Lee e Jechan Lee. "Pyrolysis for Nylon 6 Monomer Recovery from Teabag Waste". Polymers 12, n. 11 (16 novembre 2020): 2695. http://dx.doi.org/10.3390/polym12112695.
Testo completoAbstract (sommario):
In this work, we used pyrolysis to treat teabag waste (TBW). Changes in the pyrolysis temperature affected the composition and yield of the products. For example, more non-condensable gases and less char were produced with an increase in the pyrolysis temperature. Pyrolysis conducted under a nitrogen environment yielded caprolactam at temperatures between 400 and 700 °C. An increase in the pyrolysis temperature from 400 to 500 °C increased the caprolactam yield from 3.1 to 6.2 wt.%. At 700 °C, the yield decreased to 4.6 wt.%. The highest caprolactam yield (i.e., 6.2 wt.% at 500 °C) was equivalent to 59.2 wt.% on the basis of the weight of the non-biomass part of the TBW. The pyrolytic products other than caprolactam (e.g., combustible gases, pyrolytic liquid, and char) can function as fuels to supply energy during pyrolysis in order to increase and maintain the temperature. The higher heating values (HHVs) of the combustible gases and pyrolytic liquid produced at 500 °C were 7.7 and 8.3 MJ kg−1, respectively. The HHV of the char produced at 500 °C was 23 MJ kg−1, which is comparable to the HHV of coal. This work will help to develop effective pyrolysis processes to valorize everyday waste by recovering value-added chemicals such as polymer monomers and by producing alternative fuels.
26
Halasová, Martina, Martin Černý, Adam Strachota e Zdeněk Chlup. "Effect of Pyrolysis Temperature on the Mechanical Response in Partially Pyrolysed Polysiloxanes". Key Engineering Materials 784 (ottobre 2018): 55–60. http://dx.doi.org/10.4028/www.scientific.net/kem.784.55.
Testo completoAbstract (sommario):
The pyrolysis process of polysiloxane resin conducted in the temperature range 400 – 700 °C results in hybrid materials owning some polymeric (thermosetting) behaviour. A certain level of elastic recovery and/or viscoelastic flow showed at various steps of pyrolytic transformation was monitored using the instrumented Vickers hardness method. Determined indentation force-indentation depth curves reflect the mechanical response and the level of the transformation; however, the relaxation behaviour is not covered by this method fully. An extensive indentation relaxation was revealed in the material partially pyrolysed at 400 °C, about 16 % and 8 % when the HV 0.1 and the HV 0.2 loading were applied, respectively. Materials pyrolysed from 500 to 650 °C which exhibited the indentation relaxation below 1 % and the mostly elastic response on the loading were observed. Above the pyrolysis temperature of 600 °C a rapid onset of mechanical properties, namely indentation elastic modulus and hardness, was observed. The short-term indentation relaxation was evaluated via the indentation force relaxation method in the regime of constant indentation depth obtained at the moment of reaching an initial force of 0.981 N or 1.962 N. The obtained indentation force relaxation curves were analysed on the basis of a logarithmic function. The significant effect of the pyrolysis temperature as well as the influence of loaded volume was described.
27
Elnour, Ahmed Y., Abdulaziz A. Alghyamah, Hamid M. Shaikh, Anesh M. Poulose, Saeed M. Al-Zahrani, Arfat Anis e Mohammad I. Al-Wabel. "Effect of Pyrolysis Temperature on Biochar Microstructural Evolution, Physicochemical Characteristics, and Its Influence on Biochar/Polypropylene Composites". Applied Sciences 9, n. 6 (18 marzo 2019): 1149. http://dx.doi.org/10.3390/app9061149.
Testo completoAbstract (sommario):
Environmental management through effective utilization of biowastes has been a topic of intensive research in recent years. This study examines the effect of pyrolysis temperature on the physical and morphological characteristic of biochar (BC) derived from lignocellulosic wastes. The biochar was prepared by pyrolysing date palm biomass at various temperatures, i.e., 300, 400, 500, 600, and 700 °C. These pyrolysed biochars were then characterized for their carbon content, mineral compositions, chemical functionalities, and morphological structures, for understanding their physicochemical characteristics and microstructural evolution. It was revealed that the pyrolytic condition plays a key role in the formation of biochar microstructure. These biochar samples were then utilized without any further treatments/purifications for their practical application as reinforcement materials for polymer composites. They were blended with a polypropylene matrix by a melt mixing technique followed by injection molding process. The type of biochar was found to significantly affect the composites properties. Differences in microstructure, surface chemistry, and chemical compositions of BCs were observed to be determining factors affecting the compatibility and thermomechanical properties of resulted composites.
28
Zhao, Rongwen, Zhongyang Liu, Tongjun Liu e Liping Tan. "Pyrolysis behaviors, kinetics, and byproducts of enzymatic hydrolysis residues for lignocellulosic biorefining". BioResources 16, n. 2 (18 febbraio 2021): 2626–43. http://dx.doi.org/10.15376/biores.16.2.2626-2643.
Testo completoAbstract (sommario):
Enzymatic hydrolysis residues (EHR) are the solid wastes from enzymatic hydrolysis and/or fermentation of the cellulosic bioethanol industry. These byproducts have not been effectively used. Thermogravimetric analysis with infrared spectroscopy (TG-IR) and pyrolysis-gas chromatography/ mass spectrometry (Py-GC/MS) were used to quantify the pyrolytic bioenergy potential of EHR with alkaline hydrogen peroxide (AHP) and bisulfite (BSF) pretreatment through assessing their pyrolysis behaviors, kinetics, and byproducts. The TG-IR analysis showed that the EHR pyrolysis temperature range was 180 °C to 620 °C and consisted of three consecutive stages: dehydration, rapid pyrolysis, and carbonization. The main volatile products evolved from the EHR pyrolysis were CO, CO2, H2O, and CH4. Fast pyrolysis results from Py-GC/MS indicated that the main pyrolytic byproducts of EHR were phenols (30.68%), furans (14.27%), and acids (8.52%) for AHP-EHR; and phenols (26.75%), furans (15.54%), and acids (10.33%) for BSF-EHR. The results provide insights for expanding the potential of bioenergy and increasing the value-added byproducts based on the biomass part of EHR.
29
Purevsuren, Barnasan, Otgonchuluun Dashzeveg, Ariunaa Alyeksandr, Narangerel Janchig e Jargalmaa Soninkhuu. "Pyrolysis of pine wood and characterisation of solid and liquid products". Mongolian Journal of Chemistry 19, n. 45 (28 dicembre 2018): 24–31. http://dx.doi.org/10.5564/mjc.v19i45.1086.
Testo completoAbstract (sommario):
Pyrolysis of pine wood was carried out at different temperatures and the yields of solid (biochar), liquid (tar and pyrolysed water) and gas products were determined. Temperature around 500 ºC was determined as an optimal heating temperature of pyrolysis and approximately 27.1% hard residue (biochar), 21.46% tar, 20.04% pyrolysed water and 31.30% gas were obtained by pyrolysis. The thermal stability indices of pine wood are relatively low, which are indications of its low thermal stability and high yield of volatile matter (Vdaf = 90.3%). The thermal stability indices of pyrolysis of solid residue show that it is characterised by a very high thermal stability than its initial sample, for example, there was an increase of Т5% 7.7 and Т15% 3.8 times. The chemical composition of pyrolysed tar of pine wood has also been determined. Were obtained 4 different fractions with varying boiling temperature ranges of pine wood pyrolysed tar and have determined the yields of each fraction. Neutral tar was analysed by GC/MS and 20 aliphatic compounds, 25 aromatic compounds and 18 polar compounds were determined.
30
Shi, Kai Qi, Tao Wu, Hai Tao Zhao, Edward Lester, Philip Hall e Yao Dong Wang. "Microwave Induced Pyrolysis of Biomass". Applied Mechanics and Materials 319 (maggio 2013): 127–33. http://dx.doi.org/10.4028/www.scientific.net/amm.319.127.
Testo completoAbstract (sommario):
Microwave heating has attracted much attention recently due to its nature of volumetric heating and instant heating. In this study, microwave heating was adopted not only as a heating method but also an approach to enhance the pyrolysis of biomass. Microwave induced pyrolysis was carried out at 500°C with silicon carbide as a microwave energy absorber. Conventional pyrolysis of gumwood was also conducted under the same operating temperature as microwave-enhanced pyrolysis. The yields of pyrolytic bio-oil and bio-gas under microwave heating are 8.52 wt% and 73.26 wt% respectively, which are higher than the products obtained via conventional methods under similar operating conditions. A series tests were performed to compare the difference between the yields of pyrolytic products, i.e. gaseous products (bio-gas), liquid products (bio-oil) and solid products( bio-char). Scanning Electron Microscope (SEM), Gas Chromatograph/Mass Spectrum (GC-MS) and Gas Chromatograph (GC) were used in this study to characterize the morphology of bio-chars, the composition of bio-gas and bio-oil respectively. The bio-oil produced via microwave pyrolysis has simpler constituents compared with that produced via conventional pyrolysis. The proportion of syngas (H2+CO) and methane (CH4) in the gas product produced under microwave-enhanced pyrolysis are 62.52 vol % and 22.41vol % respectively, which are higher than those in the products of conventional pyrolysis. It is clear that microwave-enhanced pyrolysis has shown a great potential as an alternative method for biomass conversion.
31
Pola, Josef, e Václav Chvalovský. "Laser driven pyrolysis of n-alkanes". Collection of Czechoslovak Chemical Communications 50, n. 1 (1985): 223–27. http://dx.doi.org/10.1135/cccc19850223.
Testo completoAbstract (sommario):
CW CO2 laser photosensitized (SF6) homogeneous pyrolysis of n-alkanes (C5-C7) affords almost twice higher yield of important ethylene compared to conventional pyrolysis in tubular reactors. No production of heavy pyrolytic oils, resins or coke and very small alteration of the pyrolytic distribution with the conversion are other advantages of the laser process that can be ascribed to the absence of in conventional reactors important surface reactions.
32
Kushch, S. D., V. E. Muradyan e N. S. Kuyunko. "Methane Conversion over Vacuum Carbon Black: Influence of Hydrogen". Eurasian Chemico-Technological Journal 3, n. 3 (5 luglio 2017): 163. http://dx.doi.org/10.18321/ectj560.
Testo completoAbstract (sommario):
<p>Methane pyrolysis over vacuum carbon black has been studied in the temperature range 550–1000 °C. The methane conversion degree and selectivity with respect to ethene and propene do not depend on the initial concentration of methane <em>i.e. </em>the process order with respect to methane is first. The selectivity with respect to pyrolytic carbon is antibate to the methane initial concentration. Hydrogen introduced to methane inhibits formation of pyrolytic carbon and aromatics especially in methane pyrolysis. The methane conversion degree in pyrolysis of methane/hydrogen mixture is inversely proportional to the initial concentration of hydrogen while the selectivity with respect to ethene being symbate to the one. A hypothesis on the reason of inhibition of pyrolytic carbon formation by hydrogen is proposed. Methane pyrolysis is a homogeneous-heterogeneous reaction up to 850°C, but homogeneous reaction is prevalent at the temperature range of maximal selectivity with respect to alkenes.</p>
33
Jasminská, Natália, Tomáš Brestovič e Mária Čarnogurská. "THE EFFECT OF TEMPERATURE PYROLYSIS PROCESS OF USED TIRES ON THE QUALITY OF OUTPUT PRODUCTS". Acta Mechanica et Automatica 7, n. 1 (1 marzo 2013): 20–25. http://dx.doi.org/10.2478/ama-2013-0004.
Testo completoAbstract (sommario):
Abstract Pyrolysis together with gasification and combustion create a group of so called thermic processes. Unlike the combustion it is based on thermic decomposition of organic materials without any access of oxidative media. Within the pyrolytic process, three main fractions are created: solid residue, pyrolytic gas and organic liquid product - pyrolytic oil. The presented article examines the effects of pyrolysis operational conditions (above all, temperature) on gas products, solid residues and liquid fractions.
34
Ramesh, B. T., Javed Sayyad, Arunkumar Bongale e Anupkumar Bongale. "Extraction and Performance Analysis of Hydrocarbons from Waste Plastic Using the Pyrolysis Process". Energies 15, n. 24 (11 dicembre 2022): 9381. http://dx.doi.org/10.3390/en15249381.
Testo completoAbstract (sommario):
Ecosystem destruction is one of today’s significant challenges due to fast industrialisation and an increasing population. It takes several years for solid trash, such as plastic bottles and super-market bags, to decompose in nature. In addition, plastic disposal techniques such as landfilling, reuse, and incineration pose significant threats to human health and the environment. In this paper, we investigated whether the impact of mixing biodiesel with waste oil from recycled plastic on the resulting fuel mixture’s yields better physical and chemical properties. Consequently, pyrolysis is one of the most advantageous and practical waste disposal methods as it is both environmentally benign and efficient. Pyrolysis is the high-temperature thermal breakdown of solid waste to produce pyrolytic oil. The pyrolytic (plastic) oil produced is converted to a hydrocarbon-rich pyrolytic fuel. Similar to diesel and gasoline, pyrolytic fuel has the same calorific value. Internal combustion engines may operate on pyrolytic fuel without suffering a performance reduction. Researchers examined engine performance and exhaust pollutants. The research discovered that the engine could operate on plastic pyrolysis fuel at full load, enhance brake thermal efficiency by 6–8%, and lower UBHC and CO emissions; however, nitrous oxide (NOx) emissions were noticeably higher. The findings demonstrated the possibility of using plastic pyrolysis fuel as a diesel substitute.
35
Moško, Jaroslav, Michael Pohořelý, Siarhei Skoblia, Zdeněk Beňo e Michal Jeremiáš. "Detailed Analysis of Sewage Sludge Pyrolysis Gas: Effect of Pyrolysis Temperature". Energies 13, n. 16 (6 agosto 2020): 4087. http://dx.doi.org/10.3390/en13164087.
Testo completoAbstract (sommario):
Conventional methods of sewage sludge disposal are often limited by their environmental impact and economic demands. Pyrolysis has been studied as a viable method for sewage sludge disposal and transformation into usable products. Pyrolytic products may have various uses, and their complex characteristics shall be described to assess their potential for safe utilization. Here, we studied slow pyrolysis of stabilized sewage sludge in a fixed bed reactor at 400–800 °C to describe the composition of the pyrolysis gas and the condensate fraction. We found that condensate elemental composition was practically independent of pyrolysis temperature. On the other hand, the composition of the pyrolysis gas was strongly temperature-dependent regarding both the share of major components (H2, CO, CO2, CH4) and C2–C6 hydrocarbons speciation (which as a sum attributed to 7–9 vol. % of the gas). The increase in pyrolysis temperature also resulted in increasing the N2 content of the gas, whereas the sulfur containing gas compounds were substantially diluted in the increasing gas volume.
36
Raclavská, Helena, Hana Škrobánková, Petr Pavlík e Veronika Sassmanová. "The Properties of Material from Recovered TetraPak Beverage Cartons". Applied Mechanics and Materials 832 (aprile 2016): 3–9. http://dx.doi.org/10.4028/www.scientific.net/amm.832.3.
Testo completoAbstract (sommario):
Energy utilization (pyrolysis) of residue from fibre recycling of used beverage cartons is very important. Identification the optimal technology for separation of aluminium from pyrolytic carbon and assessment of its quality in relationship to the pyrolysis conditions is necessary for recycling of Al. The particles of pyrolytic carbon are not pure carbon, they contain only from 65 to 83 % of carbon, the rest in ash coming from sorting and collection of waste (glass, porcelain). Process of pyrolysis and/or utilization of charge reactor influenced the chemical composition of Al particles by carbon enrichment at the rim of particles up to 30 % leading to decrease of reactivity of Al surface.
37
Cao, Junrui, e Yuhui Ma. "Pyrolysis and gasification of macroalgae Enteromorpha prolifera under a CO2 atmosphere using the thermogravimetry–Fourier transform infrared spectroscopy technique". Progress in Reaction Kinetics and Mechanism 44, n. 2 (24 aprile 2019): 132–42. http://dx.doi.org/10.1177/1468678319825735.
Testo completoAbstract (sommario):
Non-isothermal pyrolysis and gasification of Enteromorpha prolifera (also known as Ulva prolifera) under a CO2 atmosphere were investigated by thermogravimetry analysis. The gaseous products were measured online with Fourier transform infrared spectroscopy coupled with thermogravimetry. The kinetic parameters of pyrolysis and gasification reactions were obtained using the Coats–Redfern method. The experimental results showed that Enteromorpha prolifera had two derivative thermogravimetry peaks centered at 240 and 800°C, indicating the pyrolysis of organics and gasification of char, respectively. Carboxylic acids, ethers, and alcohols were the dominating condensable products generated from pyrolysis between 230 and 300°C. H2O, CH4, and aliphatic hydrocarbons were also formed in this temperature range, and they were also continuously released at higher temperatures, indicating further polymerization of the freshly generated pyrolytic char. CO was mainly produced between 700 and 900°C, and its yield was much higher than that of the pyrolytic gaseous products. The Ginstling equation (the D4 model) proved to be the most probable mechanism function for both the pyrolysis and gasification stages, with activation energies of 138.30 and 93.43 kJ mol−1, respectively.
38
He, Xuan Ming, Jia Qi Fang, Ye Pan, Wei Li e Xiao Juan Wang. "Study on Mechanism of Low Temperature Co-Pyrolysis of Duckweed and Flame Coal". Advanced Materials Research 724-725 (agosto 2013): 300–305. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.300.
Testo completoAbstract (sommario):
Co-pyrolysis characteristics of long flame coal mixed with duckweed in different proportions were studied by using TG. And the kinetic parameters was also figured out by using the method of Coats-Redfern. It was exhibited significant synergistic effect created more the light component between duckweed and coal during co-pyrolysis, The pyrolysis rate of flame coal is much smaller than biomass, and the starting pyrolysis temperature of flame coal is higher than biomass. The kinetic analysis indicated that the pyrolytic processes can be described as first order reactions model. The average activation energy of duckweed and coal was 39.14kJ/mol and 46.43kJ/mol , and with the increasing of the duckweed proportion, pyrolysis activation energy was decreased.
39
Amanat, A., Z. Hussain, M. Imran Din, A. Sharif, A. Mujahid, A. Intisar, E. Ahmed, R. Khaild e M. Arshad. "Catalytic pyrolysis of Sweet Sorghum plant by using fixed-bed reactor; Effect of different temperatures on the pyrolytic bio-oil yield and FT-IR characterization". Journal of Optoelectronic and Biomedical Materials 13, n. 4 (ottobre 2021): 137–44. http://dx.doi.org/10.15251/jobm.2021.134.137.
Testo completoAbstract (sommario):
Pyrolysis of sweet sorghum, lignocellulosic graminaceous plant has been conceded using the fixed bed tubular reactor. Temperature plus catalyst are the important factors which effect the pyrolysis process. Here catalytic pyrolysis has been done by the catalyst ZnO-Fe2O3/Al2O3 at different temperatures. We have done our pyrolysis reactions on3changed temperatures i.e. 250̊ C, 350 ̊C, 450 ̊C. By using catalyst, we obtain the pyrolytic products at a very low temperature and it is proved very efficient method for biofuel production. From different temperature experimentation, we concluded that the best optimal temperature along with catalyst for pyrolysis is 350 ̊C for the yield of bio oil. Maximum yield can be obtained at this temperature.
40
Ścierski, Waldemar. "Migration of Sulfur and Nitrogen in the Pyrolysis Products of Waste and Contaminated Plastics". Applied Sciences 11, n. 10 (12 maggio 2021): 4374. http://dx.doi.org/10.3390/app11104374.
Testo completoAbstract (sommario):
The most advantageous way of managing plastics, according to circular economy assumptions, is recycling, i.e., reusing them. There are three types of plastics recycling: mechanical, chemical and energy recycling. The products of the pyrolysis process can be used for both chemical and energy recycling. Possibilities of further use of pyrolysis products depend on their physicochemical parameters. Getting to know these parameters was the aim of the research, some of which are presented in this article. The paper presents the research position for conducting the pyrolysis process and discusses the results of research on pyrolysis products of waste plastics. The process was conducted to obtain the temperature of 425 °C in the pyrolytic chamber. Such a value was chosen on the basis of my own previous research and literature analysis. The focus was on the migration of sulfur and nitrogen, as in some processes these substances may pose a certain problem. Studies have shown high possibilities of migration of these elements in products of pyrolysis process. It has been shown that the migration of sulfur is similar in the case of homogeneous and mixed waste plastics—it immobilizes mainly in pyrolytic oil. Different results were obtained for nitrogen. For homogeneous plastics, nitrogen immobilizes mainly in char and oil, whereas for mixed plastics, nitrogen immobilizes in pyrolytic gas.
41
Lu, Qiang, Xu-Ming Zhang, Zhi-Bo Zhang, Ying Zhang, Xi-Feng Zhu e Chang-Qing Dong. "Catalytic fast pyrolysis of cellulose mixed with sulfated titania to produce levoglucosenone: Analytical Py-GC/MS study". BioResources 7, n. 3 (17 maggio 2012): 2820–34. http://dx.doi.org/10.15376/biores.7.3.2820-2834.
Testo completoAbstract (sommario):
Sulfated titania (SO42-/TiO2) was prepared and used for catalytic fast pyrolysis of cellulose to produce levoglucosenone (LGO), a valuable anhydrosugar product. Analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) technique was employed in this study to achieve the catalytic fast pyrolysis of cellulose and on-line analysis of the pyrolysis vapors. Experiments were performed to investigate the effects of several factors on the LGO production, i.e. pyrolysis temperature, cellulose/catalyst ratio, TiO2 crystal type, and pyrolysis time. The results indicated that the SO42-/TiO2 catalyst lowered the initial cellulose decomposition temperature and altered the pyrolytic product significantly. Levoglucosan (LG) was the most abundant product in the non-catalytic process, while levoglucosenone (LGO) was the major product in the catalytic process. The maximal LGO yield was obtained at the set pyrolysis temperature of 400 °C, while the highest LGO content was obtained at 350 °C, with the peak area% over 50%. In addition, the SO42-/TiO2 (anatase) was confirmed the best catalyst for the LGO production.
42
Pourjafar, Mohammad, Amir Khosravani e Rabi Behrooz. "Formation mechanism of aromatics during co-pyrolysis of coal and cotton stalk". BioResources 15, n. 2 (27 aprile 2020): 4449–63. http://dx.doi.org/10.15376/biores.15.2.4449-4463.
Testo completoAbstract (sommario):
Pyrolysis experiments were conducted in a tubular furnace from room temperature to 600 °C at 5 °C /min, and kept for 15 min. The light tar was then derived from the liquid products of pyrolysis by n-hexane supersonic extraction. Gas chromatography–mass spectrometry was employed to analyze the light tars from cotton stalk (CS) pyrolysis, Shenmu coal (SM) pyrolysis, and co-pyrolysis of CS/SM. Microcrystalline cellulose (MCC) was selected as a model compound, and the light tar from co-pyrolysis tar of MCC/SM was investigated for comparison. The results indicated that CS improved the yields and quality of phenols and benzenes in co-pyrolysis tar and that MCC had excellent performance in the formation of mononuclear aromatics during the co-pyrolysis of MCC/SM. Based on the pyrolytic behavior of CS and SM, the mechanisms of aromatic formation were further determined. It was shown that the free radicals that cracked from CS accelerated the formation of aromatics. The alkyl and mononuclear aromatic radicals of CS pyrolysis combined with the radicals from the SM aromatic structure, which then converted to benzenes and phenols. Finally, the most favorable reaction routes of mononuclear aromatics formation were proposed.
43
Saringat, Muhammad Ilmam B., Ayub M. Som, Norhayati Talib e Mohammad Asadullah. "Kinetic Parameters of Biomass Pyrolysis – Comparison between Thermally Thick and Fine Particles of Biomass". Advanced Materials Research 1113 (luglio 2015): 340–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.340.
Testo completoAbstract (sommario):
In this study, kinetic parameters of fast and slow pyrolysis is compared. For fast pyrolysis, cylindrical wood pieces of 20 mm diameter and 50 mm length is pyrolysed in a tube furnace at temperatures ranging from 300°C to 500°C. Solid, liquid and gas products are collected and the yields are calculated. For slow pyrolysis, thermogravimetric analysis (TGA) is used using sawdust from the same biomass. Using the experimental data from two different methods the kinetic parameters are calculated such as activation energy and pre-exponential factor for the two different pyrolysis methods. For fast pyrolysis the parameters are found to be E = 32.5 kJ/mol andA= 35/min and for slow pyrolysis Es= 50.48 kJ/mol andAs= 3179.86/min. The large difference between the values show that kinetic studies and modelling work using thermogravimetric analysis data is not suitable for commercial scale simulation. Also, the pre-exponential value for fast pyrolysis shows that the kinetic equation used from flash pyrolysis is not exactly suitable for this situation. Therefore, it is recommended that more studies on the kinetic parameters of fast pyrolysis of thermally thick biomass need to be done.
44
Usino, David O., Taner Sar, Päivi Ylitervo e Tobias Richards. "Effect of Acid Pretreatment on the Primary Products of Biomass Fast Pyrolysis". Energies 16, n. 5 (1 marzo 2023): 2377. http://dx.doi.org/10.3390/en16052377.
Testo completoAbstract (sommario):
A high load of inorganics in raw lignocellulosic biomass is known to inhibit the yield of bio-oil and alter the chemical reactions during fast pyrolysis of biomass. In this study, palm kernel shell (PKS), an agricultural residue from palm oil production, and two other woody biomass samples (mahogany (MAH) sawdust and iroko (IRO) sawdust) were pretreated with distilled water or an acidic solution (either acetic, formic, hydrochloric (HCl) or sulfuric acid (H2SO4)) before fast pyrolysis in order to investigate its effect on the primary products and pyrolysis reaction pathways. The raw and pretreated PKS, MAH and IRO were pyrolysed at 600 °C and 5 s with a micro-pyrolyser connected to a gas chromatograph–mass spectrometer/flame ionisation detector (GC-MS/FID). Of the leaching solutions, HCl was the most effective in removing inorganics from the biomass and enhancing the primary pyrolysis product formed compared to the organic acids (acetic and formic acid). The production of levoglucosan was greatly improved for all pretreated biomasses when compared to the original biomass but especially after HCl pretreatment. Additionally, the relative content of the saccharides was maximised after pretreatment with H2SO4, which was due to the increased production of levoglucosenone. The relative content of the saccharides increased by over 70%. This increase may have occurred due to a possible reaction catalysed by the remaining acid in the biomass. The production of furans, especially furfural, was increased for all pretreatments but most noticeable when H2SO4 was used. However, the relative content of acids and ketones was generally reduced for PKS, MAH and IRO across all leaching solutions. The relative content of the phenol-type compound decreased to a large extent during pyrolysis after acid pretreatment, which may be attributed to dehydration and demethoxylation reactions. This study shows that the production of valuable chemicals could be promoted by pretreatment with different acid solutions.
45
Julius Gbenga Akinbomi, Olawale Theophilus Ogunwumi, Rosemary Ojone Daniel, Omolade Olajumoke Eweje, Samuel Adeola Oluwajobi, Samuel Olamijuwon Elegbede, Ahmed Ajao e Olusola Oladeji. "Influence of waste sorting on the effectiveness of polymeric waste pyrolysis". Global Journal of Engineering and Technology Advances 10, n. 3 (30 marzo 2022): 079–84. http://dx.doi.org/10.30574/gjeta.2022.10.3.0042.
Testo completoAbstract (sommario):
Pyrolysis of polymeric wastes, including waste plastic bottles, discarded rubber tyres and pure water sachets, is one of the environmental-friendly processes for waste valorization. However, continuous effort must be made to reduce the cost implication of the pyrolysis process in terms of time, money and energy requirement. Based on this premise, this study examined the justification regarding heat absorption rate and product yield, for sorting polymeric waste mixture before the pyrolysis process. The objective was achieved by carrying out pyrolysis of the separated and mixed plastic bottle, rubber tyre and water nylon sachet wastes using a semi batch pyrolysis system. The results indicated that at residence time of 100 minutes, maximum heat absorption rates of 128.63 and 89.38 kJ/min were obtained for pyrolysis of separated and mixed wastes, respectively, of plastic bottles and rubber tyres. For the pyrolysis of separated and mixed wastes of plastic bottles, rubber tyres and water nylon sachets; maximum heat absorption rates of 144.56 and 119.46 kJ/min, respectively, were obtained. It was also observed that the amounts of pyrolytic products produced after the pyrolysis of the separated polymeric wastes were greater than the amounts obtained after the pyrolysis of the mixed polymeric wastes. This indicates that sorting polymeric wastes into different categories before pyrolysis contributes to effective pyrolysis process.
46
Zhang, Zhi Bo, Xiao Ning Ye, Qiang Lu, Chang Qing Dong e Yong Qian Liu. "Production of Phenolic Compounds from Low Temperature Catalytic Fast Pyrolysis of Biomass with Activated Carbon". Applied Mechanics and Materials 541-542 (marzo 2014): 190–94. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.190.
Testo completoAbstract (sommario):
Activated carbon (AC) was reported as a promising catalyst to selectively produce phenolic compounds from biomass using the micro-wave assisted catalytic pyrolysis technique. In order to evaluate the catalytic performance of the AC under the traditional fast pyrolysis process, analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) technique was applied for the catalytic fast pyrolysis of biomass mixed with the AC. Polar wood was selected as the feedstock, and experiments were conducted to reveal the AC-catalyzed poplar wood pyrolysis behavior and product distribution. The results indicated that the AC was also effective for the phenolics production in the traditional fast pyrolysis process at 350 °C. It could promote the formation of phenolic compounds, and inhibit most of the other pyrolytic products. The maximal phenolics yield was obtained at the biomass to catalyst ratio of 1:4, with the peak area% over 50%.
47
Partata, Andréia Ramos, Priciane Martins Parreira, Humberto Molinar Henrique e Carlos Eduardo Batista Avelar. "An Alternative Fuel for Lime Industry: Evaluation the Pyrolysis of the Scrap Tires". Materials Science Forum 591-593 (agosto 2008): 206–11. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.206.
Testo completoAbstract (sommario):
Scrap tire is considered an environmental concern with inadequate final disposal. A good alternative can be to use the tire as an energy source. Pyrolysis is a thermal process that can transform the rubber portion of used tires into oil, gas and pyrolytic carbon. This type of carbon can be converted into carbon black (CB). The lime industry that demands great amount of energy could be one of the ways to take advantage the scrap tires adequately as energy source. This work aimed to study the operational conditions of the pyrolysis process as well as investigating the possibility to use the pyrolysis products from used tires as industrial fuel. A batch pilot-scale pyrolysis unit was built. Temperatures from 400 to 600oC and relative pressures from 0 to -500 mmHg were investigated in order to evaluate product distribution and quality. Experimental results showed that as the reactor temperature was increased the pyrolytic carbon yield remained constant with a mean of 39.8 wt % and the pyrolytic oil yield reached a maximum value of 45.1 wt % at 500 °C. It is also possible to show that the pyrolytic oil can be used as liquid fuels because of its high heating value (40-42 MJ/kg), excellent viscosity (1.6-3.7 cS), and reasonable sulfur content (0.97-1.54wt %). In addition, chemical and physical characterization was made in order to compare the pyrolytic carbon and oil with currently fuels used in Brazilian lime industries (wood charcoal and coke of petroleum).
48
Mishra, Ranjeet Kumar, e Kaustubha Mohanty. "Pyrolysis of low-value waste sawdust over low-cost catalysts: physicochemical characterization of pyrolytic oil and value-added biochar". Biofuel Research Journal 9, n. 4 (1 dicembre 2022): 1736–49. http://dx.doi.org/10.18331/brj2022.9.4.4.
Testo completoAbstract (sommario):
The present work deals with an experimental investigation into the generation and characterization of pyrolytic oil and biochar from Sal wood sawdust (SW). The pyrolysis experiment was performed in a semi-batch reactor at 500 oC and 80 oC/min heating rate with CaO, CuO, and Al2O3 catalysts. Further, the pyrolytic oil and biochar were investigated using different analyses, including proximate analysis, elemental analysis, thermal stability, GC-MS, FTIR, field emission scanning electron microscopy, electrical conductivity analysis, higher heating value (HHV), zeta potential analysis, and ash content analysis. Pyrolysis results revealed that compared to thermal pyrolysis (46.02 wt%), the pyrolytic oil yield was improved by catalytic pyrolysis with CaO and CuO (50.02 and 48.23 wt%, respectively). Further, the characterization of pyrolytic oil revealed that the loading of catalysts considerably improved the oil's properties by lowering its viscosity (69.50 to 22 cSt), ash content (0.26 to 0.11 wt%), and oxygen content (28.32 to16.60 %) while raising its acidity (4.2 to 9.6), heating value (25.66 to 36.09 MJ/kg), and carbon content (61.79 to 74.28%). According to the FTIR analysis, the pyrolytic oil contained hydrocarbons, phenols, aromatics, alcohols, and oxygenated compounds. Additionally, the GC-MS analysis showed that catalysts significantly reduced oxygenated fractions, phenols (20.23 to 15.26%), acids (12.23 to 6.56%), and increased hydrocarbons (12 to 16 wt%). Additionally, the results of the biochar analysis demonstrated that SW biochar was appropriate for a range of industrial applications, including in catalysts, supercapacitors, fuel cells, and bio-composite materials.
49
Brown, RFC, KJ Coulston, FW Eastwood, MJ Irvine e ADE Pullin. "Argon Matrix Infrared Spectroscopic Evidence for the Generation of Pentatetraenone by Flash Pyrolysis of Suitable Precursors". Australian Journal of Chemistry 41, n. 2 (1988): 225. http://dx.doi.org/10.1071/ch9880225.
Testo completoAbstract (sommario):
Five compounds were investigated as precursors for the pyrolytic generation of pentatetraenone, H2C=C=C=C=C=O. These were (1)-(4): 3- ethenylidenebicyclo [2.2.1]hept-5-ene with the following 2,2 substituents : H, COOCOCF3 (1); H, 13COOCOCF3 (1′); (COOCOCF3)2 (2); (COO)2C(CH3)(OCH3) (3); (COO)2Si(CH3)2 (4) and 5-(3′- methylenebicyclo [2.2.1]hept-5′-en-2′-ylidene)-2,2-dimethyl-1,3-dioxan-4,6-dione (5). The five precursors were pyrolysed in a stream of argon at temperatures in the range 350-725°C and the pyrolysate -argon mixture condensed on a CsI plate at c. 10 K. Infrared spectra were obtained between 4000 and 250 cm-1. All five precursors gave two strong bands in the spectral region 2070-2250 cm-1, possibly attributable to pentatetraenone. At lower pyrolytic temperatures the more intense of the two bands was a broad band centred at c. 2128 cm-1 [precursors (1)- (4)] or at c. 2094 cm-1 [precursor (5)]. At higher pyrolytic temperatures these bands were diminished in intensity and replaced by a narrow band at 2207 cm-1 for all five precursors. Bands due to the expected other products for each pyrolysis reaction to form pentatetraenone were observed. H2C413CO ( pentatetraenone substituted by 13C at the carbonyl carbon atom) was prepared by pyrolysis of precursor (1′). We assign the broad bands at c. 2128 cm-1 [precursors (1)-(4)] and at c. 2094 [precursor (5)] to incompletely pyrolysed precursor in which cyclopentadiene has been retained but decomposition in the rest of the molecule has resulted in formation of a =C=C=O group. Bands at 2207, 2068 and 1726 cm-1 we assign to v2-v4 of pentatetraenone. Corresponding bands at 2168, 2056 and 1720 cm-1 are observed in the spectrum of H2C413CO.
50
Asueta, Asier, Laura Fulgencio-Medrano, Rafael Miguel-Fernández, Jon Leivar, Izotz Amundarain, Ana Iruskieta, Sixto Arnaiz, Jose Ignacio Gutiérrez-Ortiz e Alexander Lopez-Urionabarrenechea. "A Preliminary Study on the Use of Highly Aromatic Pyrolysis Oils Coming from Plastic Waste as Alternative Liquid Fuels". Materials 16, n. 18 (20 settembre 2023): 6306. http://dx.doi.org/10.3390/ma16186306.
Testo completoAbstract (sommario):
In this work, the low-temperature pyrolysis of a real plastic mixture sample collected at a WEEE-authorised recycling facility has been investigated. The sample was pyrolysed in a batch reactor in different temperature and residence time conditions and auto-generated pressure by following a factorial design, with the objective of maximising the liquid (oil) fraction. Furthermore, the main polymers constituting the real sample were also pyrolysed in order to understand their role in the generation of oil. The pyrolysis oils were characterised and compared with commercial fuel oil number 6. The results showed that in comparison to commercial fuel oil, pyrolysis oils coming from WEEE plastic waste had similar heating values, were lighter and less viscous and presented similar toxicity profiles in fumes of combustion.