Log in

Relevant bibliographies by topics / Membrane reactors / Journal articles

Journal articles on the topic 'Membrane reactors'

To see the other types of publications on this topic, follow the link: Membrane reactors.

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Membrane reactors.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Ma, Yi Hua. "Dense Palladium and Perovskite Membranes and Membrane Reactors." MRS Bulletin 24, no. 3 (March 1999): 46–49. http://dx.doi.org/10.1557/s0883769400051915.

Full text

Abstract:

The development of high-temperature processes and tighter environmental regulations requires utilization of efficient gas-separation processes that will provide high fluxes, high selectivity of separation, and the ability to operate at elevated temperatures. Dense inorganic membranes and membrane reactors are especially well suited for high-temperature reactions and separations, due in part to their thermal stability and high separation selectivity (in theory, infinite). Furthermore, membrane reactors offer an inherent advantage of combining reaction, product concentration, and separation in a single-unit operation for the improvement of process economics and waste minimization.The classification of membrane reactors can either be by membrane material and geometry or by the configuration of the reactor. Porous and dense membranes in both tubular and disk forms have been used for membrane reactors. The membrane can either be catalytically active (catalytic membrane reactor [CMR]) or simply act as a separation medium. In the latter case, the catalyst is packed in the reactor, whose walls are formed by the membrane (packed-bed membrane reactor [PBMR]). In addition, if the membrane is also catalytically active, the reactor is called a packed-bed catalytic membrane reactor (PBCMR).The principal materials from which porous inorganic (ceramic) membranes are made are alumina, zirconia, and glass. Alumina and zirconia membranes are usually asymmetric and composite, with a porous support (0.5–2.0 mm thick) for mechanical strength and one or more thin layers for carrying out separations.On the other hand, glass membranes, such as Vycor and microporous glass, have symmetric pores. Materials commonly used as the porous support are alumina, granular carbon, sintered metal, and silicon carbide.

APA, Harvard, Vancouver, ISO, and other styles

2

Taghizadeh, Majid, and Fatemeh Aghili. "Recent advances in membrane reactors for hydrogen production by steam reforming of ethanol as a renewable resource." Reviews in Chemical Engineering 35, no. 3 (March 26, 2019): 377–92. http://dx.doi.org/10.1515/revce-2017-0083.

Full text

Abstract:

AbstractDuring the last decade, hydrogen has attracted lots of interest due to its potential as an energy carrier. Ethanol is one of the renewable resources that can be considered as a sustainable candidate for hydrogen generation. In this regard, producing hydrogen from ethanol steam reforming (ESR) would be an environmentally friendly process. Commonly, ESR is performed in packed bed reactors; however, this process needs several stages for hydrogen separation with desired purity. Recently, the concept of a membrane reactor, an attractive device integrating catalytic reactions and separation processes in a single unit, has allowed obtaining a smaller reactor volume, higher conversion degrees, and higher hydrogen yield in comparison to conventional reactors. This paper deals with recent advances in ESR in terms of catalyst utilization and the fundamental of membranes. The main part of this paper discusses the performance of different membrane reactor configurations, mainly packed bed membrane reactors, fluidized bed membrane reactors, and micro-membrane reactors. In addition, a short overview is given about the impact of ESR via different catalysts such as noble metal, non-noble metal, and bi-metallic catalysts.

APA, Harvard, Vancouver, ISO, and other styles

3

Escolástico, Sonia, Falk Schulze-Küppers, Stefan Baumann, Katja Haas-Santo, and Roland Dittmeyer. "Development and Proof of Concept of a Compact Metallic Reactor for MIEC Ceramic Membranes." Membranes 11, no. 7 (July 16, 2021): 541. http://dx.doi.org/10.3390/membranes11070541.

Full text

Abstract:

The integration of mixed ionic–electronic conducting separation membranes in catalytic membrane reactors can yield more environmentally safe and economically efficient processes. Concentration polarization effects are observed in these types of membranes when O2 permeating fluxes are significantly high. These undesired effects can be overcome by the development of new membrane reactors where mass transport and heat transfer are enhanced by adopting state-of-the-art microfabrication. In addition, careful control over the fluid dynamics regime by employing compact metallic reactors equipped with microchannels could allow the rapid extraction of the products, minimizing undesired secondary reactions. Moreover, a high membrane surface area to catalyst volume ratio can be achieved. In this work, a compact metallic reactor was developed for the integration of mixed ionic–electronic conducting ceramic membranes. An asymmetric all-La0.6Sr0.4Co0.2Fe0.8O3–δ membrane was sealed to the metallic reactor by the reactive air brazing technique. O2 permeation was evaluated as a proof of concept, and the influence of different parameters, such as temperature, sweep gas flow rates and oxygen partial pressure in the feed gas, were evaluated.

APA, Harvard, Vancouver, ISO, and other styles

4

Ishikawa, Haruo. "Membrane reactors for enzyme reactions." membrane 14, no. 3 (1989): 186–95. http://dx.doi.org/10.5360/membrane.14.186.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Wang, Zhigang, Tianjia Chen, Nikita Dewangan, Ziwei Li, Sonali Das, Subhasis Pati, Zhan Li, Jerry Y. S. Lin, and Sibudjing Kawi. "Catalytic mixed conducting ceramic membrane reactors for methane conversion." Reaction Chemistry & Engineering 5, no. 10 (2020): 1868–91. http://dx.doi.org/10.1039/d0re00177e.

Full text

Abstract:

Schematic of catalytic mixed conducting ceramic membrane reactors for various reactions: (a) O₂ permeable ceramic membrane reactor; (b) H₂ permeable ceramic membrane reactor; (c) CO₂ permeable ceramic membrane reactor.

APA, Harvard, Vancouver, ISO, and other styles

6

Itoh, Naotsugu. "Membrane Reactors." MEMBRANE 31, no. 1 (2006): 14–15. http://dx.doi.org/10.5360/membrane.31.14.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Algieri, Catia, Gerardo Coppola, Debolina Mukherjee, Mahaad Issa Shammas, Vincenza Calabro, Stefano Curcio, and Sudip Chakraborty. "Catalytic Membrane Reactors: The Industrial Applications Perspective." Catalysts 11, no. 6 (May 29, 2021): 691. http://dx.doi.org/10.3390/catal11060691.

Full text

Abstract:

Catalytic membrane reactors have been widely used in different production industries around the world. Applying a catalytic membrane reactor (CMR) reduces waste generation from a cleaner process perspective and reduces energy consumption in line with the process intensification strategy. A CMR combines a chemical or biochemical reaction with a membrane separation process in a single unit by improving the performance of the process in terms of conversion and selectivity. The core of the CMR is the membrane which can be polymeric or inorganic depending on the operating conditions of the catalytic process. Besides, the membrane can be inert or catalytically active. The number of studies devoted to applying CMR with higher membrane area per unit volume in multi-phase reactions remains very limited for both catalytic polymeric and inorganic membranes. The various bio-based catalytic membrane system is also used in a different commercial application. The opportunities and advantages offered by applying catalytic membrane reactors to multi-phase systems need to be further explored. In this review, the preparation and the application of inorganic membrane reactors in the different catalytic processes as water gas shift (WGS), Fisher Tropsch synthesis (FTS), selective CO oxidation (CO SeLox), and so on, have been discussed.

APA, Harvard, Vancouver, ISO, and other styles

8

Helmi, Arash, and Fausto Gallucci. "Latest Developments in Membrane (Bio)Reactors." Processes 8, no. 10 (October 2, 2020): 1239. http://dx.doi.org/10.3390/pr8101239.

Full text

Abstract:

The integration of membranes inside a catalytic reactor is an intensification strategy to combine separation and reaction steps in one single physical unit. In this case, a selective removal or addition of a reactant or product will occur, which can circumvent thermodynamic equilibrium and drive the system performance towards a higher product selectivity. In the case of an inorganic membrane reactor, a membrane separation is coupled with a reaction system (e.g., steam reforming, autothermal reforming, etc.), while in a membrane bioreactor a biological treatment is combined with a separation through the membranes. The objective of this article is to review the latest developments in membrane reactors in both inorganic and membrane bioreactors, followed by a report on new trends, applications, and future perspectives.

APA, Harvard, Vancouver, ISO, and other styles

9

Hwang, Sun-Tak. "Inorganic membranes and membrane reactors." Korean Journal of Chemical Engineering 18, no. 6 (November 2001): 775–87. http://dx.doi.org/10.1007/bf02705597.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Nishida, Ryoichi, Toshiki Tago, Takashi Saitoh, Masahiro Seshimo, and Shin-ichi Nakao. "Development of CVD Silica Membranes Having High Hydrogen Permeance and Steam Durability and a Membrane Reactor for a Water Gas Shift Reaction." Membranes 9, no. 11 (October 30, 2019): 140. http://dx.doi.org/10.3390/membranes9110140.

Full text

Abstract:

Water gas shift reaction of carbon monoxide (CO) with membrane reactors should be a promising method for hydrogen mass-production because of its high CO conversion, high hydrogen purity and low carbon dioxide emission. For developing such membrane reactors, we need hydrogen permselective membranes with high hydrogen permeance with order of 10−6 mol m−2 s−1 Pa−1 at 573 K and high steam durability. In this study, we have optimized the kind of substrates, precursors, vapor concentration, and chemical vapor deposition (CVD) time using the counter-diffusion CVD method for developing such membranes. The developed membrane prepared from hexamethyldisiloxane has a hydrogen permeance of 1.29 × 10−6 mol m−2 s−1 Pa−1 at 573 K and high steam durability. We also conducted water gas shift reactions with membrane reactors installed the developed silica membranes. The results indicated that reactions proceed efficiently with the conversion around 95–97%, hydrogen purity around 94%, and hydrogen recovery around 60% at space velocity (SV) 7000.

APA, Harvard, Vancouver, ISO, and other styles

11

Juarez, Ester, Javier Lasobras, Jaime Soler, Javier Herguido, and Miguel Menéndez. "Polymer–Ceramic Composite Membranes for Water Removal in Membrane Reactors." Membranes 11, no. 7 (June 26, 2021): 472. http://dx.doi.org/10.3390/membranes11070472.

Full text

Abstract:

Methanol can be obtained through CO2 hydrogenation in a membrane reactor with higher yield or lower pressure than in a conventional packed bed reactor. In this study, we explore a new kind of membrane with the potential suitability for such membrane reactors. Silicone–ceramic composite membranes are synthetized and characterized for their capability to selectively remove water from a mixture containing hydrogen, CO2, and water at temperatures typical for methanol synthesis. We show that this membrane can achieve selective permeation of water under such harsh conditions, and thus is an alternative candidate for use in membrane reactors for processes where water is one of the products and the yield is limited by thermodynamic equilibrium.

APA, Harvard, Vancouver, ISO, and other styles

12

Kusakabe, Katsuki. "Zeolite membrane reactors." membrane 28, no. 4 (2003): 185–90. http://dx.doi.org/10.5360/membrane.28.185.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Argurio, Pietro, Enrica Fontananova, Raffaele Molinari, and Enrico Drioli. "Photocatalytic Membranes in Photocatalytic Membrane Reactors." Processes 6, no. 9 (September 7, 2018): 162. http://dx.doi.org/10.3390/pr6090162.

Full text

Abstract:

The present work gives a critical overview of the recent progresses and new perspectives in the field of photocatalytic membranes (PMs) in photocatalytic membrane reactors (PMRs), thus highlighting the main advantages and the still existing limitations for large scale applications in the perspective of a sustainable growth. The classification of the PMRs is mainly based on the location of the photocatalyst with respect to the membranes and distinguished in: (i) PMRs with photocatalyst solubilized or suspended in solution and (ii) PMRs with photocatalyst immobilized in/on a membrane (i.e., a PM). The main factors affecting the two types of PMRs are deeply discussed. A multidisciplinary approach for the progress of research in PMs and PMRs is presented starting from selected case studies. A special attention is dedicated to PMRs employing dispersed TiO2 confined in the reactor by a membrane for wastewater treatment. Moreover, the design and development of efficient photocatalytic membranes by the heterogenization of polyoxometalates in/on polymeric membranes is discussed for applications in environmental friendly advanced oxidation processes and fine chemical synthesis.

APA, Harvard, Vancouver, ISO, and other styles

14

Zhang, Zhicheng, Wanglin Zhou, Tianlei Wang, Zhenbin Gu, Yongfan Zhu, Zhengkun Liu, Zhentao Wu, Guangru Zhang, and Wanqin Jin. "Ion–Conducting Ceramic Membrane Reactors for the Conversion of Chemicals." Membranes 13, no. 7 (June 25, 2023): 621. http://dx.doi.org/10.3390/membranes13070621.

Full text

Abstract:

Ion–conducting ceramic membranes, such as mixed oxygen ionic and electronic conducting (MIEC) membranes and mixed proton–electron conducting (MPEC) membranes, have the potential for absolute selectivity for specific gases at high temperatures. By utilizing these membranes in membrane reactors, it is possible to combine reaction and separation processes into one unit, leading to a reduction in by–product formation and enabling the use of thermal effects to achieve efficient and sustainable chemical production. As a result, membrane reactors show great promise in the production of various chemicals and fuels. This paper provides an overview of recent developments in dense ceramic catalytic membrane reactors and their potential for chemical production. This review covers different types of membrane reactors and their principles, advantages, disadvantages, and key issues. The paper also discusses the configuration and design of catalytic membrane reactors. Finally, the paper offers insights into the challenges of scaling up membrane reactors from experimental stages to practical applications.

APA, Harvard, Vancouver, ISO, and other styles

15

Drioli, Enrico. "Membrane reactors." Chemical Engineering and Processing: Process Intensification 43, no. 9 (September 2004): 1101–2. http://dx.doi.org/10.1016/j.cep.2004.04.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Bishop, Brent A., and Fernando V. Lima. "Novel Module-Based Membrane Reactor Design Approach for Improved Operability Performance." Membranes 11, no. 2 (February 23, 2021): 157. http://dx.doi.org/10.3390/membranes11020157.

Full text

Abstract:

This work aims to address the design and control challenges caused by the integration of phenomena and the loss of degrees of freedom (DOF) that occur in the intensification of membrane reactor units. First, a novel approach to designing membrane reactor units is proposed. This approach consists of designing smaller modules based on specific phenomena such as heat exchange, reactions, and mass transport and combining them in series to produce the final modular membrane-based unit. This approach to designing membrane reactors is then assessed using a process operability analysis for the first time to maximize the operability index, as a way of quantifying the operational performance of intensified processes. This work demonstrates that by designing membrane reactors in this way, the operability of the original membrane reactor design can be significantly improved, translating to an improvement in achievability for a potential control structure implementation.

APA, Harvard, Vancouver, ISO, and other styles

17

Lu, Ningning, and Donglai Xie. "Novel Membrane Reactor Concepts for Hydrogen Production from Hydrocarbons: A Review." International Journal of Chemical Reactor Engineering 14, no. 1 (February 1, 2016): 1–31. http://dx.doi.org/10.1515/ijcre-2015-0050.

Full text

Abstract:

AbstractMembrane reactors are attracting increasing attention for ultrapure hydrogen production from fossil fuel, integrating catalytic reaction and separation processes into one single unit thus can realize the removal of hydrogen or introduction of reactant in situ, which removes the thermodynamic bottleneck and improves hydrogen yield and selectivity. In this review, the state-of-the-art concepts for hydrogen production through membrane reactors are introduced, mainly including fixed bed membrane reactors, fluidized bed membrane reactors, and micro-channel membrane reactors, referring higher hydrocarbons as feedstock, such as ethanol, propane, or heptane; novel heating methods, like solar energy realized through molten salt; new modular designs, including panel and tubular configurations; ultra-compact micro-channel designs; carbon dioxide capture with chemical looping; multifuel processors for liquid and/or solid hydrocarbons; etc. Recent developments and commercialization hurdles for each type of membrane reactor are summarized. Modeling the reactor is fundamental to explore complex hydrodynamics in reactor systems, meaningful to investigate the effects of some important operating factors on reactor performances. Researches for reactor modeling are also discussed. Reaction kinetics for hydrocarbons reforming and reactor hydrodynamics are summarized respectively. Cold model is introduced to investigate physical phenomena in reactors.

APA, Harvard, Vancouver, ISO, and other styles

18

Kassi, Alaa Hasan, and Tahseen A. Al-Hattab. "A Review: Membrane Reactor for Hydrogen Production: Modeling and Simulation." Engineering Chemistry 4 (August 11, 2023): 17–31. http://dx.doi.org/10.4028/p-xakne1.

Full text

Abstract:

A membrane reactor is a multifactional vessel used for H2 production. Hydrogen's three spectrum colors are dependent on carbon present. Two types of membrane with high permeability to hydrogen (polymeric and metallic) Hydrogen is produced in two systems: conventional reactors and membrane reactors (which separate and purify hydrogen in a single vessel). There are many types of membrane reactors according to design (catalytic membrane reactor (CMR), fixed bed reactor (FBMR), fluidized bed reactor (FBMR), etc. The transport mechanism of H2 through the membrane by a "sorption-diffusion mechanism" and the government equations that are used for membrane reactor modeling and simulation, such as continuity, momentum, mass, and heat transfer equations of the CMR, and the thickness of the membrane. These equations are solved by MATLAB, COMSOL, and the Finite Element Method to simulate the MR at different parameters: rate of conversion, rate of sweep gas, temperature, pressure, rate of H2 permeation through a membrane, and activity of the catalyst. We summarized theoretical studies for membrane reactors, including the operation conditions, type of hydrocarbon feed, type of production method, kind of catalyst, and heat effect.

APA, Harvard, Vancouver, ISO, and other styles

19

Matsukata, Masahiko. "Prospects for Membrane Reactors." MEMBRANE 46, no. 3 (2021): 118–23. http://dx.doi.org/10.5360/membrane.46.118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Brunetti, Adele, and Enrica Fontananova. "CO2 Conversion by Membrane Reactors." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3124–34. http://dx.doi.org/10.1166/jnn.2019.16649.

Full text

Abstract:

Membrane reactors technology represents a promising tool for the CO2 capture and reuse by conversion to valuable products. After a preliminary presentation of the fundamentals of this technology, a critical overview of the last achievements and new perspectives in the CO2 conversion by membrane reactors is given, highlighting the still existing limitations for large scale applications. Among the low temperature (≤100 °C) membrane reactor for CO2 conversion, electrochemical membrane reactors and photocatalytic reactors, represent the two mainly pursued systems and they were discussed starting from selected case studies. Dry reforming of methane and CO2 hydrogenation to methanol were selected as interesting examples of high temperature (>100 °C) membrane based conversion of CO2 to energy bearing products.

APA, Harvard, Vancouver, ISO, and other styles

21

Fan, X. J., and X. H. Zhang. "Characteristics of ozone decomposition inside ceramic membrane pores as nano-reactors." Water Supply 14, no. 3 (November 26, 2013): 421–28. http://dx.doi.org/10.2166/ws.2013.216.

Full text

Abstract:

The characteristics of ozone decomposition inside the nano-pores of ceramic membranes were identified according to nano-reactor configuration. Three types of ceramic membranes with a pore size of 50 nm were tested with compositions of Al2O3, MnO2/Al2O3 (4%) and CeO2/Al2O3 (4%) respectively. The results showed that the specific decomposition rate of ozone inside membrane pores was 428 times higher than that in pure water outside the pores. The influences of pH values or H2O2 dosages on ozone decomposition in bulk water can be explained on the basis of chain reactions or hydroxyl-radical mechanism; however, these did not work for the behaviours inside the nano-pores of membranes. The extents of the influences of NO3−, SO42− and Ca2+ were even opposite inside to outside the nano-pores of membranes. A unique configuration of nano-reactors within the ceramic membranes tested was proposed based on zeta potentials and water molecule-clusters. Inner charge layer and highly ordered water clusters might play critical roles for the reaction processes inside the nano-reactors.

APA, Harvard, Vancouver, ISO, and other styles

22

Valdés, Freddy, Priscila Rosseto Camiloti, Jan Bartacek, Álvaro Torres-Aravena, Javiera Toledo-Alarcón, Marcelo Zaiat, and David Jeison. "Micro-Oxygenation in Upflow Anaerobic Sludge Bed (UASB) Reactors Using a Silicon Membrane for Sulfide Oxidation." Polymers 12, no. 9 (September 1, 2020): 1990. http://dx.doi.org/10.3390/polym12091990.

Full text

Abstract:

Sulfide produced by sulphate-reducing bacteria in anaerobic reactors can seriously affect biogas quality. Microaeration has become a reliable way to remove sulfide, by promoting its oxidation. However, limited research is available regarding its application in upflow anaerobic sludge bed (UASB) reactors. In this research, silicon membranes were studied as a mechanism to dose oxygen in USAB reactors. Two configurations were tested: the membrane placed inside the reactor or in an external module. Our results show that the external membrane proved to be a more practical alternative, providing conditions for sulfide oxidation. This led to a reduction in its concentration in the liquid effluent and biogas. External membrane configuration achieved a sulfide conversion rate of 2.4 g-S m2 d−1. Since the membrane was not sulfide-selective, methane losses were observed (about 9%). In addition, excessive oxygen consumption was observed, compared to the stoichiometric requirement. As is the case for many membrane-based systems, membrane area is a key factor determining the correct operation of the system.

APA, Harvard, Vancouver, ISO, and other styles

23

Cruellas, Aitor, Jelle Heezius, Vincenzo Spallina, Martin van Sint Annaland, José Antonio Medrano, and Fausto Gallucci. "Oxidative Coupling of Methane in Membrane Reactors; A Techno-Economic Assessment." Processes 8, no. 3 (February 27, 2020): 274. http://dx.doi.org/10.3390/pr8030274.

Full text

Abstract:

Oxidative coupling of methane (OCM) is a process to directly convert methane into ethylene. However, its ethylene yield is limited in conventional reactors by the nature of the reaction system. In this work, the integration of different membranes to increase the overall performance of the large-scale oxidative coupling of methane process has been investigated from a techno-economic point of view. A 1D membrane reactor model has been developed, and the results show that the OCM reactor yield is significantly improved when integrating either porous or dense membranes in packed bed reactors. These higher yields have a positive impact on the economics and performance of the downstream separation, resulting in a cost of ethylene production of 595–625 €/tonC2H4 depending on the type of membranes employed, 25–30% lower than the benchmark technology based on oil as feedstock (naphtha steam cracking). Despite the use of a cryogenic separation unit, the porous membranes configuration shows generally better results than dense ones because of the much larger membrane area required in the dense membranes case. In addition, the CO2 emissions of the OCM studied processes are also much lower than the benchmark technology (total CO2 emissions are reduced by 96% in the dense membranes case and by 88% in the porous membranes case, with respect to naphtha steam cracking), where the high direct CO2 emissions have a major impact on the process. However, the scalability and the issues associated with it seem to be the main constraints to the industrial application of the process, since experimental studies of these membrane reactor technologies have been carried out just on a very small scale.

APA, Harvard, Vancouver, ISO, and other styles

24

Hsieh, H. P. "Inorganic Membrane Reactors." Catalysis Reviews 33, no. 1-2 (February 1991): 1–70. http://dx.doi.org/10.1080/01614949108020296.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Zaman, J., and A. Chakma. "Inorganic membrane reactors." Journal of Membrane Science 92, no. 1 (June 1994): 1–28. http://dx.doi.org/10.1016/0376-7388(94)80010-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Ghahremani, Milad, Kamran Ghasemzadeh, Elham Jalilnejad, and Adolfo Iulianelli. "A Theoretical Analysis on a Multi-Bed Pervaporation Membrane Reactor during Levulinic Acid Esterification Using the Computational Fluid Dynamic Method." Membranes 11, no. 8 (August 17, 2021): 635. http://dx.doi.org/10.3390/membranes11080635.

Full text

Abstract:

Pervaporation is a peculiar membrane separation process, which is considered for integration with a variety of reactions in promising new applications. Pervaporation membrane reactors have some specific uses in sustainable chemistry, such as the esterification processes. This theoretical study based on the computational fluid dynamics method aims to evaluate the performance of a multi-bed pervaporation membrane reactor (including poly (vinyl alcohol) membrane) to produce ethyl levulinate as a significant fuel additive, coming from the esterification of levulinic acid. For comparison, an equivalent multi-bed traditional reactor is also studied at the same operating conditions of the aforementioned pervaporation membrane reactor. A computational fluid dynamics model was developed and validated by experimental literature data. The effects of reaction temperature, catalyst loading, feed molar ratio, and feed flow rate on the reactor’s performance in terms of levulinic acid conversion and water removal were hence studied. The simulations indicated that the multi-bed pervaporation membrane reactor results to be the best solution over the multi-bed traditional reactor, presenting the best simulation results at 343 K, 2 bar, catalyst loading 8.6 g, feed flow rate 7 mm3/s, and feed molar ratio 3 with levulinic acid conversion equal to 95.3% and 91.1% water removal.

APA, Harvard, Vancouver, ISO, and other styles

27

Hughes, Ronald. "Composite palladium membranes for catalytic membrane reactors." Membrane Technology 2001, no. 131 (March 2001): 9–13. http://dx.doi.org/10.1016/s0958-2118(01)80152-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Kolb, F. R., and P. A. Wilderer. "Activated carbon membrane biofilm reactor for the degradation of volatile organic pollutants." Water Science and Technology 31, no. 1 (January 1, 1995): 205–13. http://dx.doi.org/10.2166/wst.1995.0046.

Full text

Abstract:

For the treatment of inhibitory wastewaters, biofilm reactors are distinguished by high process stability and flexibility. The activated carbon membrane biofilm reactor described in this paper combines the advantages of membrane technology and activated carbon adsorption in order to biologically degrade volatile organic pollutants in wastewater. Membranes provide oxygen, and activated carbon ensures a rapid reduction of organic concentration below the toxicity limit of the microorganisms. Two different reactor types are compared in this investigation.

APA, Harvard, Vancouver, ISO, and other styles

29

Mustafa Kamal Pasha, Mustafa Kamal Pasha, Iftikhar Ahmad Iftikhar Ahmad, Jawad Mustafa Jawad Mustafa, and Manabu Kano Manabu Kano. "Modeling of a Nickel-based Fluidized Bed Membrane Reactor for Steam Methane Reforming Process." Journal of the chemical society of pakistan 41, no. 2 (2019): 219. http://dx.doi.org/10.52568/000729/jcsp/41.02.2019.

Full text

Abstract:

Hydrogen being a green fuel is rapidly gaining importance in the energy sector. Steam methane reforming is one of the most industrially important chemical reaction and a key step in the production of high purity hydrogen. Due to inherent deficiencies of conventional reforming reactors, a new concept based on fluidized bed membrane reactor is getting the focus of researchers. In this work, a nickel-based fluidized bed membrane reactor model is developed in the Aspen PLUSand#174; process simulator. A user-defined membrane module is embedded in the Aspen PLUSand#174; through its interface with Microsoftand#174; Excel. Then, a series combination of Gibbs reactors and membrane modules are used to develop a nickel-based fluidized bed membrane reactor. The model developed for nickel-based fluidized bed membrane reactor is compared with palladium-based membrane reactor in terms of methane conversion and hydrogen yield for a given panel of major operating parameters. The simulation results indicated that the model can accurately predict the behavior of a membrane reactor under different operating conditions. In addition, the model can be used to estimate the effective membrane area required for a given rate of hydrogen production.

APA, Harvard, Vancouver, ISO, and other styles

30

Molinari, Raffaele, Cristina Lavorato, and Pietro Argurio. "The Evolution of Photocatalytic Membrane Reactors over the Last 20 Years: A State of the Art Perspective." Catalysts 11, no. 7 (June 26, 2021): 775. http://dx.doi.org/10.3390/catal11070775.

Full text

Abstract:

The research on photocatalytic membrane reactors (PMRs) started around the year 2000 with the study of wastewater treatment by degradation reactions of recalcitrant organic pollutants, and since then the evolution of our scientific knowledge has increased significantly, broadening interest in reactions such as the synthesis of organic chemicals. In this paper, we focus on some initial problems and how they have been solved/reduced over time to improve the performance of processes in PMRs. Some know-how gained during these last two decades of research concerns decreasing/avoiding the degradation of the polymeric membranes, improving photocatalyst reuse, decreasing membrane fouling, enhancing visible light photocatalysts, and improving selectivity towards the reaction product(s) in synthesis reactions (partial oxidation and reduction). All these aspects are discussed in detail in this review. This technology seems quite mature in the case of water and wastewater treatment using submerged photocatalytic membrane reactors (SPMRs), while for applications concerning synthesis reactions, additional knowledge is required.

APA, Harvard, Vancouver, ISO, and other styles

31

Primozic, Mateja, Maja Habulin, Muzafera Paljevac, and Zeljko Knez. "Enzyme-catalyzed reactions in different types of high-pressure enzymatic reactors." Chemical Industry and Chemical Engineering Quarterly 12, no. 3 (2006): 159–63. http://dx.doi.org/10.2298/ciceq0603159p.

Full text

Abstract:

The enzyme-catalyzed hydrolysis of carboxy-methyl cellulose (CMC) was performed in three different types of reactors; in a batch stirred-tank reactor (BSTR) operating at atmospheric pressure, in a high-pressure batch stirred-tank reactor (HP BSTR) and in a high-pressure continuous tubular-membrane reactor (HP CTMR). In the high-pressure reactors aqueous SC CO2 was used as the reaction medium. The aim of our research was optimization of the reaction parameters for reaction performance. All the reactions were catalyzed by cellulase from Humicola insolens. Glucose production in the high-pressure batch stirred-tank reactor was faster than in the BSTR at atmospheric pressure. The optimal temperature for the reaction performed in the BSTR at atmospheric pressure was 30?C, while the optimal temperature for the reaction performed in SC CO2 was 32?C. The influence of the application of tubular ceramic membranes in the high-pressure reaction system was studied on the model reaction of CMC hydrolysis at atmospheric pressure and in SC CO2. The reaction was catalyzed by cellulase from Humicola insolens covalently linked to the surface of the ceramic membrane. The hydrolysis of CMC in SC CO2 and at atmospheric pressure was performed for a long time period. The reaction carried out in SC CO2 was more productive than the reaction performed at atmospheric pressure.

APA, Harvard, Vancouver, ISO, and other styles

32

Regmi, Chhabilal, Shabnam Lotfi, Jonathan Cawettiere Espíndola, Kristina Fischer, Agnes Schulze, and Andrea Iris Schäfer. "Comparison of Photocatalytic Membrane Reactor Types for the Degradation of an Organic Molecule by TiO2-Coated PES Membrane." Catalysts 10, no. 7 (June 29, 2020): 725. http://dx.doi.org/10.3390/catal10070725.

Full text

Abstract:

Photocatalytic membrane reactors with different configurations (design, flow modes and light sources) have been widely applied for pollutant removal. A thorough understanding of the contribution of reactor design to performance is required to be able to compare photocatalytic materials. Reactors with different flow designs are implemented for process efficiency comparisons. Several figures-of-merit, namely adapted space-time yield (STY) and photocatalytic space-time yield (PSTY), specific energy consumption (SEC) and degradation rate constants, were used to assess the performance of batch, flow-along and flow-through reactors. A fair comparison of reactor performance, considering throughput together with energy efficiency and photocatalytic activity, was only possible with the modified PSTY. When comparing the three reactors at the example of methylene blue (MB) degradation under LED irradiation, flow-through proved to be the most efficient design. PSTY1/PSTY2 values were approximately 10 times higher than both the batch and flow-along processes. The highest activity of such a reactor is attributed to its unique flow design which allowed the reaction to take place not only on the outer surface of the membrane but also within its pores. The enhancement of the mass transfer when flowing in a narrow space (220 nm in flow-through) contributes to an additional MB removal.

APA, Harvard, Vancouver, ISO, and other styles

33

Itoh, Naotsugu. "Membrane Reactors for Efficient Hydrogen Production." MEMBRANE 30, no. 1 (2005): 38–45. http://dx.doi.org/10.5360/membrane.30.38.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Alinejad, Milad Mohammad, Kamran Ghasemzadeh, Adolfo Iulianelli, Simona Liguori, and Milad Ghahremani. "CFD Development of a Silica Membrane Reactor during HI Decomposition Reaction Coupling with CO2 Methanation at Sulfur–Iodine Cycle." Nanomaterials 12, no. 5 (February 28, 2022): 824. http://dx.doi.org/10.3390/nano12050824.

Full text

Abstract:

In this work, a novel structure of a hydrogen-membrane reactor coupling HI decomposition and CO2 methanation was proposed, and it was based on the adoption of silica membranes instead of metallic, according to their ever more consistent utilization as nanomaterial for hydrogen separation/purification. A 2D model was built up and the effects of feed flow rate, sweep gas flow rate and reaction pressure were examined by CFD simulation. This work well proves the feasibility and advantage of the membrane reactor that integrates HI decomposition and CO2 methanation reactions. Indeed, two membrane reactor systems were compared: on one hand, a simple membrane reactor without proceeding towards any CO2 methanation reaction; on the other hand, a membrane reactor coupling the HI decomposition with the CO2 methanation reaction. The simulations demonstrated that the hydrogen recovery in the first membrane reactor was higher than the methanation membrane reactor. This was due to the consumption of hydrogen during the CO2 methanation reaction, occurring in the permeate side of the second membrane reactor system, which lowered the amount of hydrogen recovered in the outlet streams. After model validation, this theoretical study allows one to evaluate the effect of different operating parameters on the performance of both the membrane reactors, such as the pressure variation between 1 and 5 bar, the feed flow rate between 10 and 50 mm3/s and the sweep gas flow rate between 166.6 and 833.3 mm3/s. The theoretical predictions demonstrated that the best results in terms of HI conversion were 74.5% for the methanation membrane reactor and 67% for the simple membrane reactor.

APA, Harvard, Vancouver, ISO, and other styles

35

Habulin, Maja, Mateja Primožič, and Željko Knez. "Enzymatic Reactions in High-Pressure Membrane Reactors." Industrial & Engineering Chemistry Research 44, no. 25 (December 2005): 9619–25. http://dx.doi.org/10.1021/ie0502685.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Ghasem, Nayef. "A Review of the CFD Modeling of Hydrogen Production in Catalytic Steam Reforming Reactors." International Journal of Molecular Sciences 23, no. 24 (December 16, 2022): 16064. http://dx.doi.org/10.3390/ijms232416064.

Full text

Abstract:

Global demand for alternative renewable energy sources is increasing due to the consumption of fossil fuels and the increase in greenhouse gas emissions. Hydrogen (H2) from biomass gasification is a green energy segment among the alternative options, as it is environmentally friendly, renewable, and sustainable. Accordingly, researchers focus on conducting experiments and modeling the reforming reactions in conventional and membrane reactors. The construction of computational fluid dynamics (CFD) models is an essential tool used by researchers to study the performance of reforming and membrane reactors for hydrogen production and the effect of operating parameters on the methane stream, improving processes for reforming untreated biogas in a catalyst-fixed bed and membrane reactors. This review article aims to provide a good CFD model overview of recent progress in catalyzing hydrogen production through various reactors, sustainable steam reforming systems, and carbon dioxide utilization. This article discusses some of the issues, challenges, and conceivable arrangements to aid the efficient generation of hydrogen from steam reforming catalytic reactions and membrane reactors of bioproducts and fossil fuels.

APA, Harvard, Vancouver, ISO, and other styles

37

Ao, Rui, Ruihua Lu, Guanghui Leng, Youran Zhu, Fuwu Yan, and Qinghua Yu. "A Review on Numerical Simulation of Hydrogen Production from Ammonia Decomposition." Energies 16, no. 2 (January 13, 2023): 921. http://dx.doi.org/10.3390/en16020921.

Full text

Abstract:

Ammonia (NH3) is regarded as a promising medium of hydrogen storage, due to its large hydrogen storage density, decent performance on safety and moderate storage conditions. On the user side, NH3 is generally required to decompose into hydrogen for utilization in fuel cells, and therefore it is vital for the NH3-based hydrogen storage technology development to study NH3 decomposition processes and improve the decomposition efficiency. Numerical simulation has become a powerful tool for analyzing the NH3 decomposition processes since it can provide a revealing insight into the heat and mass transfer phenomena and substantial guidance on further improving the decomposition efficiency. This paper reviews the numerical simulations of NH3 decomposition in various application scenarios, including NH3 decomposition in microreactors, coupled combustion chemical reactors, solid oxide fuel cells, and membrane reactors. The models of NH3 decomposition reactions in various scenarios and the heat and mass transport in the reactor are elaborated. The effects of reactor structure and operating conditions on the performance of NH3 decomposition reactor are analyzed. It can be found that NH3 decomposition in microchannel reactors is not limited by heat and mass transfer, and NH3 conversion can be improved by using membrane reactors under the same conditions. Finally, research prospects and opportunities are proposed in terms of model development and reactor performance improvement for NH3 decomposition.

APA, Harvard, Vancouver, ISO, and other styles

38

Trianto, Azis, Ira Santrina J. C, and Susilo Yuwono. "Simulasi produksi hidrogen melalui CO₂ methane reforming pada reaktor membran." Jurnal Teknik Kimia Indonesia 6, no. 3 (October 2, 2018): 666. http://dx.doi.org/10.5614/jtki.2007.6.3.2.

Full text

Abstract:

Hydrogen is a promising alternative fuel to establish environmentally friendly energy generation system. One of the methods for producing hydrogen is C02 methane reforming (CMR) process. Despite producing H2, this process also consumes CO2 enabling it to be used as a scheme for mitigating CO2. Conventionally, the hydrogen production via CMR is conducted in a fixed bed reactor. However low conversion is usually found in this kind of reactor. To increase conversion, a membrane reactor can be used. Two types of membrane may be employed to conduct this reaction, i.e. prorous vycor and nanosil membrane reactor. This study evaluated the performances of CMR con 1ucted in membrane ractors andfixed-bed reactor. The results show that the conversion obtained in nanosil membrane reactor is higher than those obtained in porous vycor membrane reactor and fixed-bed reactor. With the change in reactant flowrate, it is obtained that the conversions in membrane reactors are more stable than those infixed bed reactors.Keywords: Hydrogen Production, Membrane Reactor, Methane Reforming AbstrakHidrogen merupakan bahan bakar alternatif yang sangat menjanjikan untuk sistem pembangkitan energi yang lebih ramah lingkungan. Salah satu rute produksi hidrogen adalah melalui reformasi metana dengan karbondioksida (C02 Methane Reforming/CMR). Saat ini telah dikembangkan proses CMR menggunakan membran yang mampu meningkatkan laju produksi H2• Pada makalah ini dikaji dua tipe reaktor membran untuk maksud peningkatan produksi hidrogen tersebut, yakni reaktor membran dengan basis membran porous vycor dan nanosil. Sebagai pembanding, dilakukanjuga evaluasi unjuk kerja reaksi CMRpada reaktorfzxe-bed. Hasil kajian ini menurljukkan bahwa reaktor nanosil danporous vycor mampu memberikan konversiyang lebih besar dibanding reaktor fixed-bed. Lebihjauh, reaktor membran dengan nanosil membran mampu memberikan laju produksi hidrogen yang lebih tinggi dibanding reaktor membran dengan membran porous vycor. Lebih jauh, pada perubahan laju molar reaktan, reaktor membran menurijukkan stabilitas yang lebih baik dibanding reaktor fixed-bed.Kata Kunci: Produksi Hidrogen, Reaktor Membran, Reformasi Metana

APA, Harvard, Vancouver, ISO, and other styles

39

Cechetto, Valentina, Gaetano Anello, Arash Rahimalimamaghani, and Fausto Gallucci. "Carbon Molecular Sieve Membrane Reactors for Ammonia Cracking." Processes 12, no. 6 (June 6, 2024): 1168. http://dx.doi.org/10.3390/pr12061168.

Full text

Abstract:

The utilization of ammonia for hydrogen storage relies on the implementation of efficient decomposition techniques, and the membrane reactor, which allows simultaneous ammonia decomposition and hydrogen recovery, can be regarded as a promising technology. While Pd-based membranes show the highest performance for hydrogen separation, their applicability for NH3-sensitive applications, such as proton exchange membrane (PEM) fuel cells, demands relatively thick, and therefore expensive, membranes to meet the purity targets for hydrogen. To address this challenge, this study proposes a solution involving the utilization of a downstream hydrogen purification unit to remove residual ammonia, thereby enabling the use of less selective, therefore more cost-effective, membranes. Specifically, a carbon molecular sieve membrane was prepared on a tubular porous alumina support and tested for ammonia decomposition in a membrane reaction setup. Operating at 5 bar and temperatures ranging from 450 to 500 °C, NH3 conversion rates exceeding 90% were achieved, with conversion approaching thermodynamic equilibrium at temperatures above 475 °C. Simultaneously, the carbon membrane facilitated the recovery of hydrogen from ammonia, yielding recoveries of 8.2–9.8%. While the hydrogen produced at the permeate side of the reactor failed to meet the purity requirements for PEM fuel cell applications, the implementation of a downstream hydrogen purification unit comprising a fixed bed of zeolite 13X enabled the production of fuel cell-grade hydrogen. Despite performance far from being comparable with the ones achieved in the literature with Pd-based membranes, this study underscores the viability of carbon membranes for fuel cell-grade hydrogen production, showcasing their competitiveness in the field.

APA, Harvard, Vancouver, ISO, and other styles

40

Nechifor, Gheorghe. "Nanomaterials for Membranes, Membrane Reactors, and Catalyst Systems." Nanomaterials 12, no. 6 (March 14, 2022): 964. http://dx.doi.org/10.3390/nano12060964.

Full text

Abstract:

Membranes are selective and highly productive nanostructures dedicated to developing separation, concentration, and purification processes with uses in the most diverse economic and social fields: industry, agriculture, transport, environment, health, and space exploration [...]

APA, Harvard, Vancouver, ISO, and other styles

41

Tsuru, Toshinori. "Photocatalytic membrane reactors using nanoporous titanium oxide membranes." membrane 28, no. 4 (2003): 170–76. http://dx.doi.org/10.5360/membrane.28.170.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Uemiya, Shigeyuki. "Metal Membranes and Their Application to Membrane Reactors." MEMBRANE 34, no. 4 (2009): 205–11. http://dx.doi.org/10.5360/membrane.34.205.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

ANDERSON, M. A., F. TISCARENO-LECHUGA, Q. XU, and C. G. JUN HILL. "ChemInform Abstract: Catalytic Ceramic Membranes and Membrane Reactors." ChemInform 22, no. 17 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199117325.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Wilderer, Peter A. "Technology of membrane biofilm reactors operated under periodically changing process conditions." Water Science and Technology 31, no. 1 (January 1, 1995): 173–83. http://dx.doi.org/10.2166/wst.1995.0039.

Full text

Abstract:

Biological treatment of problematic wastewaters requires the application of specialized reactor systems and operation strategies. Two novel approaches to meet the specific requirements are discussed: (1) application of gas permeable membranes as a means to transfer oxygen into the reactor, and to provide surface area for biofilm growth, and (2) operation of biofilm reactors in a fill and draw mode (Sequencing Batch Biofilm Reactor (SBBR) Technology). Membrane oxygenation and biofilm SBR technology can be favourably combined to treat wastewaters which contain volatile organics, organics in low concentration (e.g. contaminated groundwater) or organics which are degraded only by selected, slow growing microorganisms. The current state of reactor development is summarized. Examples for reactor design are given.

APA, Harvard, Vancouver, ISO, and other styles

45

ITOH, Naotsugu. "Dehydrogenation by membrane reactors." Journal of The Japan Petroleum Institute 33, no. 3 (1990): 136–46. http://dx.doi.org/10.1627/jpi1958.33.136.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

PÁCA, J. "Bioreactors. VII. Membrane reactors." Kvasny Prumysl 33, no. 10 (October 1, 1987): 300–303. http://dx.doi.org/10.18832/kp1987063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Wandrey, C. "Enzymes in membrane reactors." Food Biotechnology 4, no. 1 (January 1990): 353. http://dx.doi.org/10.1080/08905439009549747.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Menéndez, Miguel. "Handbook of Membrane Reactors." International Journal of Hydrogen Energy 38, no. 23 (August 2013): 9942–43. http://dx.doi.org/10.1016/j.ijhydene.2013.05.127.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Uemiya, Shigeyuki. "Handbook of Membrane Reactors." International Journal of Hydrogen Energy 38, no. 30 (October 2013): 13491–92. http://dx.doi.org/10.1016/j.ijhydene.2013.08.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

MATSON, STEPHEN L., and JOHN A. QUINN. "Membrane Reactors in Bioprocessing." Annals of the New York Academy of Sciences 469, no. 1 Biochemical E (May 1986): 152–65. http://dx.doi.org/10.1111/j.1749-6632.1986.tb26494.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!