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Добірка наукової літератури з теми "Oxidation of VOC"

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Опубліковано: 14 березня 2023

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Статті в журналах з теми "Oxidation of VOC"

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Fiorenza, Roberto. "Bimetallic Catalysts for Volatile Organic Compound Oxidation." Catalysts 10, no. 6 (June 12, 2020): 661. http://dx.doi.org/10.3390/catal10060661.

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In recent years, the impending necessity to improve the quality of outdoor and indoor air has produced a constant increase of investigations in the methodologies to remove and/or to decrease the emission of volatile organic compounds (VOCs). Among the various strategies for VOC elimination, catalytic oxidation and recently photocatalytic oxidation are regarded as some of the most promising technologies for VOC total oxidation from urban and industrial waste streams. This work is focused on bimetallic supported catalysts, investigating systematically the progress and developments in the design of these materials. In particular, we highlight their advantages compared to those of their monometallic counterparts in terms of catalytic performance and physicochemical properties (catalytic stability and reusability). The formation of a synergistic effect between the two metals is the key feature of these particular catalysts. This review examines the state-of-the-art of a peculiar sector (the bimetallic systems) belonging to a wide area (i.e., the several catalysts used for VOC removal) with the aim to contribute to further increase the knowledge of the catalytic materials for VOC removal, stressing the promising potential applications of the bimetallic catalysts in the air purification.
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Benard, S., M. Ousmane, L. Retailleau, A. Boreave, P. Vernoux, and A. Giroir-Fendler. "Catalytic removal of propene and toluene in air over noble metal catalystThis article is one of a selection of papers published in this Special Issue on Biological Air Treatment." Canadian Journal of Civil Engineering 36, no. 12 (December 2009): 1935–45. http://dx.doi.org/10.1139/l09-135.

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In this paper we present the study of catalytic oxidation of volatile organic compound (VOC) traces in air over Pt/γ-Al2O3 catalysts. The study was carried out using a laboratory fixed-bed catalytic reactor (FBCR) with catalytic oxidation of propene and toluene as model reactions. For better understanding of catalytic activity in a FBCR, the influence of operating parameters such as of platinum (Pt) loading, total gas flow rate, VOC concentration, and oxygen content were studied. The results showed that catalytic activity increases with increase in VOC concentration and a decrease in total gas flow rate. This displayed behaviour is instrumental to working at a low temperature region for complete oxidation of volatile organic compounds.
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Lebedeva, O. E., and A. G. Sarmurzina. "Industrial wastes as catalyst precursors: VOC oxidation." Applied Catalysis B: Environmental 26, no. 1 (April 2000): L1—L3. http://dx.doi.org/10.1016/s0926-3373(99)00146-0.

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Fletcher, David B. "Successful UV/oxidation of VOC-contaminated groundwater." Remediation Journal 1, no. 3 (June 1991): 353–57. http://dx.doi.org/10.1002/rem.3440010310.

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5

Urbutis, Aurimas, and Saulius Kitrys. "Dual function adsorbent-catalyst CuO-CeO2/NaX for temperature swing oxidation of benzene, toluene and xylene." Open Chemistry 12, no. 4 (April 1, 2014): 492–501. http://dx.doi.org/10.2478/s11532-013-0398-x.

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AbstractA less common cyclic process of decontamination of benzene, toluene and o-xylene (BTX) using a dual function adsorbent-catalyst, referred to as the temperature swing oxidation, is introduced and discussed in this research. Preparation technique and characterization of the dual function adsorbent-catalyst CuO-CeO2/NaX are presented. The temperature swing oxidation of BTX consists of two stages: adsorption of the VOC from the stream saturating the adsorbent-catalyst at different levels and catalytic oxidation of concentrated VOC induced by raising bed temperature at different flow rates of regenerative air. The results indicate that at lower saturation levels and lower flow rates of regenerative air a complete oxidation performance is better. The highest obtained values of the overall conversion of toluene, o-xylene and benzene into CO2 and H2O were 99.3, 99.8 and 77.5%, respectively, proving that the temperature swing oxidation using a dual function adsorbent-catalyst is a promising VOC decontamination technique under properly selected operating conditions.
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Padilla, Ornel, Jessica Munera, Jaime Gallego, and Alexander Santamaria. "Approach to the Characterization of Monolithic Catalysts Based on La Perovskite-like Oxides and Their Application for VOC Oxidation under Simulated Indoor Environment Conditions." Catalysts 12, no. 2 (January 28, 2022): 168. http://dx.doi.org/10.3390/catal12020168.

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Catalysts are very important in controlling the pollutant emissions and are used for hundreds of chemical processes. Currently, noble metal-based catalysts are being replaced for other kinds of materials. In this study, three lanthanum-based perovskite-like oxides were synthesized (LaCo, LaCoMn, and LaMn) by the glycine-combustion method. The powder catalysts obtained were supported onto cordierite ceramic monoliths using an optimized washcoating methodology to obtain the subsequent monolithic catalysts (LaCo-S, LaCoMn-S, and LaMn-S). Sample characterization confirmed the formation of the perovskite-like phase in the powder materials as well as the presence of the perovskite phase after supporting it onto the monolithic structure. The XPS analysis showed a general decrease in lattice oxygen species for monolithic catalysts, mainly caused by the colloidal silica used as a binder agent during the washcoating process. Additionally, some variations in the oxidation state distribution for elements in Co-containing systems suggest a stronger interaction between cordierite and such catalysts. The catalytic activity results indicated that powder and monolithic catalysts were active for single-component VOC oxidation in the following order: 2-propanol > n-hexane ≅ mixture > toluene, and there was no evidence of loss of catalytic activity after supporting the catalysts. However, LaMn-S had a better catalytic performance for all VOC tested under dry conditions, achieving oxidation temperatures between 230–420 °C. The oxidation efficiency for the VOC mixture was strongly affected by the presence of moisture linking the oxidation efficiency at wet conditions to the VOC chemical nature. Additionally, for higher VOC concentrations, the catalyst efficiency decreased due to the limited number of active sites.
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Clarke, Holly J., William P. McCarthy, Maurice G. O’Sullivan, Joseph P. Kerry, and Kieran N. Kilcawley. "Oxidative Quality of Dairy Powders: Influencing Factors and Analysis." Foods 10, no. 10 (September 29, 2021): 2315. http://dx.doi.org/10.3390/foods10102315.

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Анотація:
Lipid oxidation (LO) is a primary cause of quality deterioration in fat-containing dairy powders and is often used as an estimation of a products shelf-life and consumer acceptability. The LO process produces numerous volatile organic compounds (VOC) including aldehydes, ketones and alcohols, which are known to contribute to the development of off-flavours in dairy powders. The main factors influencing the oxidative state of dairy powders and the various analytical techniques used to detect VOC as indicators of LO in dairy powders are outlined. As the ability to identify and quantify specific VOC associated with LO improves this review highlights how these techniques can be used in conjunction with olfactory and sensory analysis to better understand product specific LO processes with the aim of maximizing shelf-life without compromising quality.
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Kiralan, M., G. Çalik, S. Kiralan, A. Özaydin, G. Özkan, and M. F. Ramadan. "Stability and volatile oxidation compounds of grape seed, flax seed and black cumin seed cold-pressed oils as affected by thermal oxidation." Grasas y Aceites 70, no. 1 (January 28, 2019): 295. http://dx.doi.org/10.3989/gya.0570181.

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The old-pressed oils (CPO) from grape seeds (GSO), flax seeds (FSO) and black cumin seeds (BSO) were analyzed for their fatty acid profiles, tocopherols, total phenolics, bioactives and phenolic compositions. The stability of CPO under thermal oxidation conditions was evaluated. The main fatty acid in FSO was linolenic acid (56.5% of total fatty acids); while GSO and BSO were rich in linoleic acid, which accounted for 66.8 and 56.8%, respectively. GSO was rich in ?-tocopherol (123.0 mg/kg), while ?-tocopherol was a prevalent isomer in FSO and BSO (137.9 and 128.9 mg/kg, respectively). The total phenolic contents in the oils ranged from 554 mg GAE/kg oil (FSO) to 1140 mg GAE/kg oil (BSO). Luteolin, dihydroquercetin and benzoic acids were the dominant bioactives and phenolics in FSO, GSO and BSO, respectively. Based on the oxidative stability index (OSI) value, BSO showed the highest value (6.14 h) among the other oils. The oxidative stability of FSO and BSO were higher than GSO according to peroxide value (PV) and conjugated diene (CD) values of the oils during storage at 60 °C. Hexanal, 2,4-heptadienal and (E,E)-2,4-heptadienal were the major volatile oxidation compounds (VOC) in FSO. Hexanal and (E)-2-heptanal were the main identified VOC in the GSO and BSO under the same oxidation conditions.
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Esparza-Isunza, Tristán, and Felipe López-Isunza. "Modeling the Transient VOC (toluene) Oxidation in a Packed-Bed Catalytic Reactor." International Journal of Chemical Reactor Engineering 14, no. 6 (December 1, 2016): 1177–85. http://dx.doi.org/10.1515/ijcre-2016-0026.

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Abstract A model is developed to study the transient behavior of a non-isothermal, non-adiabatic packed-bed reactor during VOC (toluene) oxidation with air on a mixed-oxide catalyst via Mars-van Krevelen kinetic scheme. The aim is to find a safe reactor design and operating conditions for VOC elimination, which has been collected in a battery of adsorption units from dilute VOC streams. Once each adsorption column is saturated, a non-isothermal desorption takes place, and the gas stream exiting the sequence of VOC desorption columns feeds continuously the catalytic reactor for VOC elimination. The reactor model describes a 2D two-phase system interacting through the gas-solid interphase, including convection and axial and radial dispersions of mass and heat. The simulations show that the gas flow velocity, and reactor and particle diameters, are key parameters to achieve a safe design, and that traveling reaction fronts in the packed-bed exist when a series of reversible stepwise changes are performed in the concentration and temperature at the feed, as a result of the transient balance between heat generation and heat elimination along the packed-bed. When comparing the perturbation in VOC concentration at the feed versus those in temperature, a large parametric sensitivity is observed for the latter case without the presence of multiple steady states. Due to the uncertainty in the values of the effective heat transport parameters, transient responses of different magnitude are observed for the same operating conditions when using heat transport parameter of different magnitude.
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OJALA, S., U. LASSI, M. HARKONEN, T. MAUNULA, R. SILVONEN, and R. KEISKI. "Durability of VOC catalysts in solvent emission oxidation." Chemical Engineering Journal 120, no. 1-2 (July 1, 2006): 11–16. http://dx.doi.org/10.1016/j.cej.2006.03.023.

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Дисертації з теми "Oxidation of VOC"

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Holzer, Frank. "Oxidation von organischen Verbindungen unter Nutzung von porösen und unporösen Feststoffen im nichtthermischen Plasma." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970941927.

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Reed, Corey William. "VOC Catalytic Oxidation on Manganese Oxide Catalysts Using Ozone." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/28000.

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This dissertation describes the current and common problem of removing low concentrations of pollutants known as volatile organic compounds (VOCs) from large volume gas emissions. Silica-supported manganese oxide catalysts with loadings of 3, 10, 15, and 20 wt. % (as MnO2) were characterized using x-ray absorption spectroscopy and x-ray diffraction (XRD). The edge positions in the x-ray absorption spectra indicated that the oxidation state for the manganese decreased with increasing metal oxide loading from a value close to that of Mn2O3 (+3) to a value approximating that of Mn3O4 (+2⅔). The XRD was consistent with these results as the diffractograms for the supported catalysts of higher manganese oxide loading matched those of a Mn3O4 reference. The reactivity of the silica-supported manganese oxide catalysts in acetone oxidation using ozone as an oxidant was studied over the temperature range of 300 to 600 K. Both oxygen and ozone produced mainly CO2 as the product of oxidation, but in the case of ozone the reaction temperature and activation energy were significantly reduced. The effect of metal oxide loading was investigated, and the activity for acetone oxidation was greater for a 10 wt. % MnOx/SiO2 catalyst sample compared to a 3 wt. % MnOx/SiO2 sample. A detailed mechanistic study of acetone oxidation using ozone was performed on a 10 wt. % silica-supported manganese oxide catalyst utilizing Raman spectroscopy, temperature programmed desorption (TPD), and kinetic measurements. In situ Raman spectroscopy at reaction conditions identified a band at 2930 cm-1 due to an adsorbed acetone species on the silica support and a band at 890 cm-1 due to an adsorbed peroxide species on the manganese oxide. A steady-state kinetic analysis, which varied acetone partial pressure (101 â 405 Pa), ozone partial pressure (101 â 1013 Pa), and temperature (318, 333, 343, and 373 K), was used to determine reaction rate expressions, while a transient kinetic study (318 K) was used to determine the role of the adsorbed species in the reaction mechanism. It was found that the rates of the acetone and ozone reactions were equally well described by both a power rate law and a Langmuir-Hinshelwood expression. The transient experiments showed that the rates of formation and reaction of the observed peroxide surface species did not correspond to the overall reaction rate, and it was concluded that it was not directly involved in the rate determining step of the reaction. A mechanism is proposed involving the reaction of an adsorbed acetone intermediate with an atomically adsorbed oxygen species via a dual site surface reaction to form complete oxidation products.
Ph. D.
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3

Osička, Tomáš. "Katalytická oxidace VOC na komerčně dostupných katalyzátorech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241878.

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The main topic of this thesis is a catalytic oxidation which belongs to a group of modern technologies for removing emission of CO and VOC from waste air. In the introduction of this thesis, the basic concepts are defined. Further the legislative requirements associated with VOC emissions, emission limits and conditions are summarized. Described destructive and non-destructive methods for removing VOCs from waste gases are also briefly described. Increased attention is paid to the catalytic oxidation as the main theme of the thesis. It was searched for industrial applications where the catalytic oxidation is used. Another chapter is devoted to the theoretical analysis of kinetics of catalytic oxidation reactions. Firstly, the basic types of reactors are described and also material balance and reaction rate for the isothermal and adiabatic reactor. In the experimental part results of performed kinetic measurements on a pilot unit for catalytic commonly used organic solvents (VOCs) using commercially available catalysts were summarized. Pre-exponential factors and activation energies for sprinkling catalysts EnviCat VOC-5565 and EnviCat 55068 for substances ethanol, toluene and acetone were determined. "Light-off" curves for these substances and methane were measured and on sprinkled catalyst EnviCat 55068 and on monolithic catalyst Purelyst PH-304.
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Kumar, Sachin. "Gas Phase Oxidation of Dimethyl Sulfide by Titanium Dioxide Based Catalysts." Miami University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1081780904.

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Gao, Yao. "A Novel Multifunctional Photocatalytic Oxidation (PCO) Gel Preventing Mold/Mildew Growth and Volatile Organic Compound (VOC) Emission." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/623.

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Анотація:
With the increasing time people spend indoors, the indoor environment quality draws more and more attention. The concentration of indoor pollutants is usually much higher than outdoors, in which volatile organic compounds (VOCs) and mold/mildew are both major pollutants and cause many health problems to residents. Efforts devoted from academy and industry to protecting people from indoor environment problems are apparently not sufficient. Photocatalysts, such as TiO2, WO and ZnO, can absorb light photons and react with O2 and H2O to generate highly oxidative radicals, which can oxidize VOCs and disinfect microorganisms. Recently, this photocatalytic oxidation (PCO) technology has been intensively studied to reduce VOCs and disinfect bacteria in the indoor environment. Few papers address the indoor mold/mildew problem, and this research therefore endeavors to do so. The objectives are to evaluate the effectiveness of PCO technology to resist mold/mildew growth and prevent VOC emission from building materials under either UV or visible light irradiation. The models, including linear regression, logistic regression, and numerical model, are also built for interpreting experimental results and for predicting performance in application. The mold/mildew resistance of different PCO gels was examined using accelerated mold/mildew growth agar plate tests. These gels included TiO2 only and TiO2 in combination with H2O2 and with Ag. Without the application of PCO gels, no mold/mildew inhibition was observed from UV (365 nm) or visible light. Under UV light irradiation, the TiO2 gel achieved complete mold/mildew inhibition. Without light, a 12-day delay of mold growth was obtained using the Ag-TiO2/H2O2 gel. Under visible light irradiation, the Ag-TiO2/H2O2 gel was also the most effective PCO gel with a 8-day delay of mold growth, which, however, was shorter than the same gel in the condition of no light with a 10-day delay due to the light-induced deterioration of the Ag-TiO2. The reduction of VOC emission from PCO gel (TiO2 gel and Ag-TiO2/H2O2 gel) coated building materials under UV or visible light irradiation was also confirmed by small chamber tests (the Ag-TiO2/H2O2 gel with above 50% reduction of total VOC emission). A linear model was obtained for the Ag-TiO2/H2O2 gel in the condition of no light, with respect to the correlation between the delay of mold growth and the gel ingredients. A logistic model was created for predicting the probability of mold growth on different TiO2 gels with different UV light exposure time at different intensities. A numerical model was developed with better accuracy than the previous one for VOC emission from PCO gel coated building materials. This study showed that the PCO gel might be a promising multifunctional material in resisting mold/mildew growth and preventing VOC emission in the indoor environment (The TiO2 gel for complete mold/mildew inhibition and the Ag-TiO2/H2O2 gel for delay of mold growth in emergency situations and reduction of VOC emission from building materials). More stable Ag-TiO2 or other visible-light-driven photocatalysts are needed in future research because of the deterioration of the current one.
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Ferrandon, Magali. "Mixed metal oxide - noble metal catalysts for total oxidation of volatile organic compounds and carbon monoxide." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3156.

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Sihaib, Zakaria. "Oxidation of toluene traces in gas phase in presence of manganese-oxide based catalysts : relationship structure-activity." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1029.

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Dans la première partie de mon travail, j'ai préparé quatre catalyseurs différents à base d'oxydes de manganèse: une perovskite (LaMnO3), par voie sol-gel; un oxide simple (Mn2O3), par méthode rapide et un tamis moléculaire octahedrique (OMS-2) par deux méthodes de préparation différentes, via l'état solide (OMS) et la méthode hydrothermale (OMSh). Les propriétés physicochimiques de ces catalyseurs ont été caractérisées par diffraction des rayons X (DRX), adsorption-désorption de N2, analyses thermogravimétriques (ATD/ATG), analyses chimiques (ICP-OES) et réduction en température programmée (H2-RTP). Leurs performances catalytiques ont été évaluées dans la réaction d’oxydation du toluène. Trois cycles catalytiques consécutifs ont été réalisés pour chaque catalyseur afin de confirmer les performances. Afin d'évaluer la stabilité des catalyseurs dans des conditions réactionnelles, les performances catalytiques ont été étudiées sur des expériences de longue durée à température constante, pendant 24 h à 25% de conversion du toluène. Des tests d'oxydation du toluène sur un catalyseur de référence, type Pd/Al2O3 contenant 0,78% en poids de Pd, ont également été effectués à des fins de comparaison. Les caractéristiques cristallines détectées dans les modèles DRX sont bien compatibles avec la formation des structures désirées. Sur la base de leur surface spécifique et de leur réductibilité à basse température, les catalyseurs ont été classés comme suit : OMSs > Mn2O3 > OMS > LaMnO3. Cette tendance est en bon accord avec les performances observées dans l'élimination catalytique du toluène. Un modèle cinétique a été proposé et un bon accord a été obtenu lors de l'ajustement avec les données expérimentales. Dans la seconde partie de mon travail, des catalyseurs LaMnO3 (LM) avec un rapport molaire acide citrique (CA) sur nitrates métalliques (Mn et La) allant de 0,5 à 2 (LM 0,5 à LM 2) ont été synthétisés par méthode sol-gel citrate, afin d'étudier l'effet du rapport de l'acide citrique sur les propriétés physico-chimiques et les performances catalytiques. Les propriétés physicochimiques de ces catalyseurs ont été caractérisées par diffraction des rayons X (DRX), adsorption-désorption de N2 et par spectroscopie d'émission atomique de plasma à couplage inductif (ICP-AES). Sur des échantillons sélectionnés, des caractérisations supplémentaires par analyse thermogravimétrique et thermique différentielle (ATD/ATG), une réduction programmée en température par de l'hydrogène (H2-TPR) et une spectroscopie de photoélectrons X (XPS) ont été réalisées. Les résultats montrent que le rapport molaire acide citrique sur nitrates métalliques influence significativement le profil obtenu en ATD/ATG des solides non calcinés ainsi que les propriétés physico-chimiques des catalyseurs. Les caractéristiques cristallines détectées par DRX sont bien compatibles avec la formation de la phase perovskite LaMnO3. De petites caractéristiques de Mn2O3 ont été détectées dans les diagrammes de diffraction de tous les catalyseurs LM, à l'exception du rapport molaire élevé des nitrates CA / (Mn + La) (1,9 et 2,0). Inversement, des pics La2O3 sont observés pour des valeurs allant de 1,6 à 2, l'intensité la plus élevée étant détectée au rapport molaire égal à 2. Les performances catalytiques ont été évaluées dans l'oxydation du toluène en réalisant trois cycles catalytiques consécutifs pour atteindre des performances stables. Afin d'évaluer la stabilité des catalyseurs dans des conditions de réaction, des expériences à température constante ont été effectuées pendant 24 h à 17% de conversion du toluène. Les catalyseurs LM1.2, LM1.3 et LM1.5 ont montré les meilleures performances catalytiques en oxydation totale du toluène, tandis que LM1 et LM1.7 présentaient un comportement intermédiaire et LM0.8 était peu actif
In the first part of my work, I have prepared four different catalysts based on manganese oxides: a perovskite (LaMnO3), via sol-gel method; a simple oxide (Mn2O3), by rapid method and an Octahedral Molecular Sieve (OMS-2) by two different preparation methods, via solid state (OMSs) and hydrothermal method (OMSh). The physicochemical properties of these catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption, TGA/DTA, ICP-OES and H2-TPR. Their catalytic performances were evaluated in the oxidation of toluene. Three consecutive catalytic cycles were performed for each catalyst in order to reach steady state performances. In order to assess the stability of the catalysts under reaction conditions, the catalytic performances were studied upon long-term experiments running for 24 h at 25% of toluene conversion. Tests of toluene oxidation over a typical industrial catalyst, such as a commercial Pd/Al2O3 catalyst containing 0.78 wt% Pd, were also performed for comparison purposes. The crystalline features detected in the XRD patterns are well consistent with the formation of the desired structures. Based on their specific surface area and their low-temperature reducibility, the catalysts were ranked as follows: OMSs> Mn2O3> OMSh> LaMnO3. This trend was in good agreement with the performances observed in the catalytic removal of toluene. A kinetic model was proposed and a good agreement was obtained upon fitting with the experimental data. In the second part of my work, LaMnO3 (LM) catalysts with molar ratio of citric acid (CA) to metal nitrates (Mn and La) ranging from 0.5 to 2 (LM 0.5 to LM 2) were synthesized by citrate sol–gel method, in order to study effect of citric acid ratio on the physico-chemical properties and the catalytic performances. The physicochemical properties of these catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption and by inductively coupled plasma atomic emission spectroscopy (ICP-AES). Over selected samples, additional characterizations by thermogravimetric and differential thermal analysis (TGA/DTA), temperature-programmed reduction by hydrogen (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were carried out. The results show that the molar ratio of citric acid to metal nitrates significantly influenced the TGA/DTA profile of gels along with the physico-chemical properties of the catalysts. The crystalline features detected by XRD are well consistent with the formation of LaMnO3 perovskite phase. Small features of Mn2O3 were detected in the diffraction patterns of all LM catalysts except for high CA/Mn+La nitrates molar ratio (1.9 and 2.0). Conversely, La2O3 peaks appeared for values ranging from 1.6 to 2, the highest intensity being detected at molar ratio equal to 2. The catalytic performances were evaluated in the oxidation of toluene, performing three consecutive catalytic cycles in order to reach steady-state performances. In order to assess the stability of the catalysts under reaction conditions, long-term experiments running for 24 h at 17 % of toluene conversion were carried out. The catalysts LM1.2, LM1.3 and LM1.5 showed the best catalytic performances in terms of toluene conversion, LM0.8 was poor performing, while LM1 and LM1.7 exhibited an intermediate behaviour
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Brummer, Vladimír. "Zařízení pro zneškodňování odpadních plynů katalytickou oxidací." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-320159.

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This thesis deals with the design of the equipment and documentation for the design of equipment for the removal of volatile organic compounds (VOC) and carbon monoxide (CO) by catalytic oxidation and the selection of appropriate technological conditions for this technology. Introduction is devoted to familiarization with the field of the catalytic oxidation, used catalysts, catalyst supports and their active components. Advantages and disadvantages of the use of catalytic oxidation versus thermal incineration are outlined and currently applicable legislative terms for VOC and CO emissions are listed. In the next part of the thesis the fundamental mathematical tools and research findings available for catalytic reactor model designed primarily for monolithic catalysts are summarized. Presented kinetic model considers continuous reactor with plug flow of gas and adiabatic heating by oxidation reactions corrected for the heat loss of the reactor. The next chapter discusses the design of the new prototype of the catalytic oxidation pilot plant (i.e. the reactor incl. peripherals) primarily intended for monolithic catalysts and bulk catalysts in the form of the fixed bed. The basis for the design and sizing are material and energy balances in the ChemCAD for different intended use of the unit, from which boundary conditions of the unit operating parameters arises. Pilot plant has been designed and built, functionality tests was scheduled also with consecutive obtaining of experimental data not only for the reactor kinetic model. Results of the model for the catalytic combustion were in good agreement with measured data. The next part includes two industrial case studies of the catalytic oxidation process usage for the chemical industry. In particular it was dealt with a replacement of the non-catalytic combustion for the catalytic for VOC abatement from chemical production plants off-gas streams of the company Momentive Specialty Chemicals in Sokolov and German city Leuna. These case studies have brought many valuable experimental and technological knowledge from long-term pilot tests and also verification of design concept, thanks to which it was later possible to design a pilot unit for removal of pollutants in premises of NETME Centre and among other to economically evaluate the usage of catalytic oxidation for the off gas cleaning, in comparison with traditional combustion, in two completely different individual cases. This information was valuable and necessary for the verification of theoretical assumptions of the thesis on specific conditions of two different industrial productions. Based on acquired practical experience and theoretical background, guidelines for designing of devices for VOC and CO removal in the industry were developed.
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Pommer, Linda. "Oxidation of terpenes in indoor environments : A study of influencing factors." Doctoral thesis, Umeå University, Ecology and Environmental Science, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-29.

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In this thesis the oxidation of monoterpenes by O3 and NO2 and factors that influenced the oxidation were studied. In the environment both ozone (O3) and nitrogen dioxide (NO2) are present as oxidising gases, which causes sampling artefacts when using Tenax TA as an adsorbent to sample organic compounds in the air. A scrubber was developed to remove O3 and NO2 prior to the sampling tube, and artefacts during sampling were minimised when using the scrubber. The main organic compounds sampled in this thesis were two monoterpenes, alfa-pinene and delta-3-carene, due to their presence in both indoor and outdoor air. The recovery of the monoterpenes through the scrubber varied between 75-97% at relative humidities of 15-75%.

The reactions of alfa-pinene and delta-3-carene with O 3, NO2 and nitric oxide (NO) at different relative humidities (RHs) and reaction times were studied in a dark reaction chamber. The experiments were planned and performed according to an experimental design were the factors influencing the reaction (O3, NO2, NO, RH and reaction times) were varied between high and low levels. In the experiments up to 13% of the monoterpenes reacted when O3, NO2, and reaction time were at high levels, and NO, and RH were at low levels. In the evaluation eight and seven factors (including both single and interaction factors) were found to influence the amount of alfa-pinene and delta-3-carene reacted, respectively. The three most influencing factors for both of the monoterpenes were the O 3 level, the reaction time, and the RH. Increased O3 level and reaction time increased the amount of monoterpene reacted, and increased RH decreased the amount reacted.

A theoretical model of the reactions occurring in the reaction chamber was created. The amount of monoterpene reacted at different initial settings of O3, NO2, and NO were calculated, as well as the influence of different reaction pathways, and the concentrations of O3 and NO2, and NO at specific reaction times. The results of the theoretical model were that the reactivity of the gas mixture towards alfa-pinene and delta-3-carene was underestimated. But, the calculated concentrations of O3, NO2, and NO in the theoretical model were found to correspond to a high degree with experimental results performed under similar conditions. The possible associations between organic compounds in indoor air, building variables and the presence of sick building syndrome were studied using principal component analysis. The most complex model was able to separate 71% of the “sick” buildings from the “healthy” buildings. The most important variables that separated the “sick” buildings from the “healthy” buildings were a more frequent occurrence or a higher concentration of compounds with shorter retention times in the “sick” buildings.

The outcome of this thesis could be summarised as follows;

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Vilasi, Pauline. "Synthèse de nouveaux catalyseurs nanostructurés par dépôts physiques à base de pérovskite de lanthane." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA041.

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Ce travail de thèse est issu d’une collaboration entre les laboratoires de recherche FEMTO-ST de l’université technologique de Belfort-Montbéliard et IRCELYON de l’université Claude Bernard à Villeurbanne. Les objectifs de cette étude portent sur la faisabilité d’élaborer par pulvérisation cathodique magnétron des films minces de cobaltite de lanthane nanostructurés. En effet, ces films présentent des propriétés catalytiques intéressantes pour l’oxydation des composés organiques volatiles comme le propène (C3H6) ou le monoxyde de carbone (CO) qui constituent la principale source de pollution de l’air. Il sera montré dans un premier temps que les cobaltites de lanthane de formule LaCoO3 ne sont pas efficaces pour ce type d’application. La composition chimique de ce matériau sera donc modifiée en y incorporant de l’argent de manière à faire varier les propriétés physico-chimiques des films et d’augmenter leurs performances catalytiques. La morphologie des films est directement impactée par l’introduction de Ag puisqu’elle évolue d’un système dense à un système « nanofilaire ». Une autre série de dépôts sera également élaborée et testée en catalyse constituée de cobaltites de lanthane dopées avec de l’argent mais aussi du cérium. On retiendra alors que les films de LaCoO3 + Ag sont plutôt efficaces et prometteurs puisqu’ils présentent des performances catalytiques se rapprochant de celles du platine (catalyseur de référence). Néanmoins, bien que les films aient toujours cette morphologie nanofilaire, les compositions chimiques des films élaborés à base de LaCoO3 + Ag + Ce doivent être optimisées afin d’augmenter leurs activités catalytiques
This work was made in the frame of a scientific research relationships between the laboratory FEMTO-ST of the Technological University of Belfort-Montbéliard and the laboratory IRCELYON of the Claude Bernard University of Villeurbanne. This study aims at characterizing the feasibility of nanostructured lanthanum cobaltite thin films via magnetron sputtering. Indeed, it is well known these materials have interesting catalytic properties regarding the oxidation of volatile organic compounds such as propene (C3H6) or carbon monoxide (CO), the latter being the main source of air pollution. First, it has been shown that lanthanum cobaltites of formula LaCoO3 are not efficient for this type of application. The chemical composition of this material was then modified by incorporating silver so as to vary the physicochemical properties of the films and increase their catalytic performance. In consequence, the morphology of the films was directly impacted by the introduction of Ag since it evolved from a dense system to a "nanowire" system. Another series of deposits based on cobaltite modified by both silver and cerium additions have been also developed and tested during catalytic tests. It should be noted that the Ag containing thin films of LaCoO3 are rather efficient and then promising since they have catalytic performances close to those of platinum (the reference catalyst). Concerning the Ag and Ce containing perovskite films, although they still have this peculiar nanowired morphology, their chemical compositions have to be optimized in order to increase their catalytic activities
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Книги з теми "Oxidation of VOC"

1

Pasadena (Calif.). Water and Power Dept., James M. Montgomery, Consulting Engineers., and AWWA Research Foundation, eds. Advanced oxidation processes for control of off-gas emissions from VOC stripping. Denver, CO: AWWA Research Foundation, 1989.

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2

Stuttgart, Universität, ed. 1,3,5-Tripyrrolidinobenzole [Tripyrrolidinobenzole]: Modellverbindungen für die elektrophile Substitution und Oxidation von Aromaten-Untersuchungen zur Stabilität von s-Komplexen [Sigma-Komplexen] und zum Mechanismus der oxidativen Dimerisierung. [S.l.]: [s.n.], 1985.

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Kabus, Armin. Energie- und Redoxstoffwechsel von Corynebacterium glutamicum. Jülich: Forschungszentrum Jülich, 2006.

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4

S, Gangwal, and Air and Energy Engineering Research Laboratory., eds. Mixture effects in the catalytic oxidation of VOCs in air: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory, 1988.

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5

S, Gangwal, and Air and Energy Engineering Research Laboratory, eds. Mixture effects in the catalytic oxidation of VOCs in air: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory, 1988.

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6

Thebrath, Bernward. Bildung, Oxidation und Emission von Methan sowie anaerobe Stoffumsätze in limnischen Standorten. Konstanz: Hartung-Gorre, 1991.

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7

Yoswathana, Nuttawan. The absorption of VOCs from air into aqueous solution with subsequent chemical oxidation. Birmingham: University of Birmingham, 2000.

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8

Böttcher, Jürgen. Redoxpotential und Eh/pH-Diagramme von Stoffumsetzungen in reduzierendem Grundwasser (Beispiel Fuhrberger Feld). Hannover: Bundesanstalt für Geowissenschaften und Rohstoffe, 1985.

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9

Recker, Carla. Kontinuierliche katalytische Oxidation von Isomaltulose und verwandten Verbindungen: Verfahrensentwicklung und Synthese polymerer Folgeprodukte mit Komplexierungsvermögen. [S.l: s.n.], 1995.

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10

Grisstede, Ina. Die partielle Oxidation von Propan zu Acrylsa ure: Bestimmung der Reaktionskinetik und in-situ Charakterisierung des Katalysators unter Betriebsbedingungen. Karlsruhe: Univ.-Verl., 2005.

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Частини книг з теми "Oxidation of VOC"

1

Becker, K. H., I. Barnes, A. Bierbach, K. J. Brockmann, F. Kirchner, B. Klotz, H. G. Libuda, et al. "OH Initiated Oxidation of VOC under Variable NOx Conditions." In Chemical Processes in Atmospheric Oxidation, 79–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-59216-4_4.

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2

Alistair Kerr, J., David W. Stocker, Marco Semadeni, Jürg Eberhard, and Claudia Müller. "The Rates and Mechanisms for VOC Photo-oxidation Reactions under Simulated Tropospheric Conditions." In Chemical Processes in Atmospheric Oxidation, 128–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-59216-4_10.

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3

Nelson, David L., and Michael M. Cox. "Die Oxidation von Fettsäuren." In Springer-Lehrbuch, 645–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-08289-8_17.

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4

Steinborn, Dirk. "Oxidation von Olefinen und Alkanen." In Grundlagen der metallorganischen Komplexkatalyse, 283–313. Wiesbaden: Vieweg+Teubner, 2010. http://dx.doi.org/10.1007/978-3-8348-9375-8_13.

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5

Steinborn, Dirk. "Oxidation von Olefinen und Alkanen." In Studienbücher Chemie, 423–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-56604-6_14.

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6

Pathan, Amrin, and Anupama Shrivastav. "Biological Based Methods for the Removal of VOCs and Heavy Metals." In Advanced Oxidation Processes for Wastewater Treatment, 271–83. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003165958-22.

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7

Tsilimingas, N., A. Warnholtz, M. Wendt, and T. Münzel. "Angiotensin II and Oxidative Stress." In Angiotensin Vol. II, 3–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18497-0_1.

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8

Mongkolsuk, Skorn, Sangpen Chamnongpol, Niwat Supsamran, and Siritida Rabibhadana. "Oxidative Stress Response in Xanthomonas oryzae." In Advances in Molecular Genetics of Plant-Microbe Interactions, Vol. 2, 253–57. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-0651-3_27.

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9

Glogar, P., M. Cerny, K. Balik, D. Loidl, J. Brandstetter, and K. Kromp. "Schädigung durch Oxidation von faserverstärkten Verbundwerkstoffen mit keramischer Matrix bei hohen Temperaturen." In Verbundwerkstoffe, 343–48. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/9783527609017.ch54.

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Luangmonkong, Theerut, Su Suriguga, Henricus A. M. Mutsaers, Geny M. M. Groothuis, Peter Olinga, and Miriam Boersema. "Targeting Oxidative Stress for the Treatment of Liver Fibrosis." In Reviews of Physiology, Biochemistry and Pharmacology, Vol. 175, 71–102. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/112_2018_10.

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Тези доповідей конференцій з теми "Oxidation of VOC"

1

Einaga, Hisahiro, Takashi Ibusuki, and Shigeru Futamura. "Photocatalytic Oxidation of Benzene in Air." In ASME 2003 International Solar Energy Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/isec2003-44205.

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Photocatalytic oxidation of benzene in air at room temperature was studied in order to obtain the information on its reactivity on the photoirradiated TiO2 catalyst. The objective of this paper is to describe in detail the dependence of the rate for benzene photooxidation on humidity, initial benzene concentration, and incident light intensity, since they are important factors for construction of VOC control system utilizing solar energy. The reaction mechanism is also discussed to understand the decomposition behavior of benzene.
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de Rivas, B., R. López-Fonseca, M. A. Gutiérrez-Ortiz, and J. I. Gutiérrez-Ortiz. "Catalytic performance of chlorinated Ce/Zr mixed oxides for Cl-VOC oxidation." In WASTE MANAGEMENT 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/wm080871.

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3

Maggos, Th, P. Leva, J. G. Bartzis, Ch Vasilakos, and D. Kotzias. "Gas phase photocatalytic oxidation of VOC using TiO2-containing paint: influence of NO and relative humidity." In AIR POLLUTION 2007. Southampton, UK: WIT Press, 2007. http://dx.doi.org/10.2495/air070581.

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4

Coll, I., F. Lasry, S. Fayet, M. Samaali, J. L. Ponche, G. Causera, C. Lesponne, and S. François. "3D ozone production in relation to VOC emission and oxidation, and the assessment of 2010 ozone control strategies." In AIR POLLUTION 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/air06051.

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Petrauskaitė, Erika, and Rasa Vaiškūnaitė. "Experimental Study of Droplet Biofilter Packed with Green Sphagnum." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.041.

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Air cleaning from VOC (volatile organic compunds) group of contaminants could be done by using different types of methods: adsoption, absorption, chemical or thermal oxidation. However, the most promising method is biological air cleaning. Biofilters have found most of their success in the treatment of dilute high-flow waste gas sreams containing odors or volatile organic compounds. To evaluate the meaning of the applicability of green sphagnum use in the droplet biofilter we will make the research. Sphagnum as a plant has big capabilities to absorb water and hold it in the porous parts plant structure. This characteristic of the plant could affect the water flow in the lower layer of the biolfiltrer and in this case will change the possibility to microorganisms to create right envinment to absorb and degrade the polluted air. The main aim of this research is the experimental study of droplet biofilter packed with green sphagnum.
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6

Kale, Abhijit S., William Nemeth, Matthew Page, Sumit Agarwal, and Paul Stradins. "Effect of Growth and Post-Oxidation Annealing Temperature of Thermally Grown Tunneling SiOx), on the Iimplied Voc of Passivated Contacts for c-Si Based Solar Cells." In 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC). IEEE, 2017. http://dx.doi.org/10.1109/pvsc.2017.8366167.

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7

Parker, Todd. "Fugitive Methane Emission Reduction Using Gas Turbines." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-314.

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Natural gas transmission systems have many sources of fugitive methane emissions that have been difficult to eliminate. This paper discusses an option for dealing with one such source for operations using turbo-compressor units fitted with dry gas seals. Dry seals rely on a small leakage of process gas to maintain the differential pressure of the process against the atmosphere. The seal leakage ultimately results in waste gas that is emitted to the atmosphere through the primary vent. A simple, cost effective, emission disposal mechanism for this application is to vent the seal gas into the gas turbine’s air intake. Explosion hazards are not created by the resultant ultra-lean fuel/air mixture, and once this mixture reaches the combustion chamber, where sufficient fuel is added to create a flammable mixture, significant oxidation of the seal vent gas is realized. Background of the relevant processes is discussed as well as a review of field test data. Similar applications have been reported [1] for the more generalized purpose of Volatile Organic Compound (VOC) destruction using specialized gas turbine combustor designs. As described herein, existing production gas turbine combustors are quite effective at fugitive methane destruction without specialized combustor designs.
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Yu, Huili, Kaili Zhang, and Carole Rossi. "Theoretical Investigation on Nano TiO2 Photocatalytic Oxidation of VOCs." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21406.

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Controlling mechanisms for photocatalytic degradation of volatile organic compounds by nano TiO2 catalyst are found to be mass transfer, diffusion, adsorption and photochemistry. A mathematical model for the degradation process is developed by incorporating these mechanisms in a plane plate air purification physical model. Finite difference method is employed to solve the governing equation and boundary conditions. The computation results are validated using the data from experiments. The model is then used to investigate the effects of some key factors on the degradation of formaldehyde including UV light intensity, UV light attenuation coefficient, adsorption, catalyst thickness, and flow rate.
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Peng, L. H., Y. C. Hsu, C. H. Liao, K. T. Hsu, C. S. Jong, C. N. Huang, J. K. Ho, C. C. Chiu, and C. Y. Chen. "Oxidation enhanced optical response on gallium nitride." In Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39. IEEE, 2000. http://dx.doi.org/10.1109/cleo.2000.906972.

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Levine, Lanfang H., Jeffrey T. Richards, William A. Rigdon, Paul E. Hintze, Raymond M. Wheeler, and John C. Sager. "Development of a Photocatalytic Oxidation-Based TOC Analyzer Part II: Effect of Reactor Design and Operation Parameters on Oxidation Efficiency of VOCs." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-01-2545.

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Звіти організацій з теми "Oxidation of VOC"

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Koziel, Jacek, Yael Laor, Jeffrey Zimmerman, Robert Armon, Steven Hoff, and Uzi Ravid. Simultaneous Treatment of Odorants and Pathogens Emitted from Confined Animal Feeding Operations (CAFOs) by Advanced Oxidation Technologies. United States Department of Agriculture, January 2009. http://dx.doi.org/10.32747/2009.7592646.bard.

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A feasibility study was conducted, aiming to explore the potential effectiveness of UV/TiO2/O3 photooxidation technologies for simultaneous treatment of odorant and pathogen emissions from livestock and poultry operations. Several key parameters were tested in laboratory (US) and semi-pilot (Israel) scale conditions including: the effects of light energy dose (treatment time and light intensity), relative humidity and air temperature, UV wavelength, presence of photocatalyst (TiO2) and the presence of ozone. Removal and conversion of odor, target gases (sulfur-containing volatile organic compounds S-VOCs, volatile fatty acids (VFAs), phenolics, and ammonia), and airborne pathogens was tested. Up to 100% removal (below method detection level) of S-VOCs, VFAs, and phenolics, the overall odor, and up to 64.5% of ammonia was achieved with optimized treatment. Treatments involving deep UV band (185 nm) and photocatalyst (TiO2) were more efficient in removal/conversion of odorous gases and odor. The estimate of the operational cost of treatment was based on measured emissions of several odorous VOCs from full scale, commercial swine farm ranges from $0.15 to $0.59 per finisher pig. This figure represents significantly lower cost compared with the cost of biofiltration or air scrubbing.
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Testoni, A. L. Energy Efficient Removal of Volatile Organic Compounds (VOCs) and Organic Hazardous Air Pollutants (o-HAPs) from Industrial Waste Streams by Direct Electron Oxidation. Office of Scientific and Technical Information (OSTI), October 2011. http://dx.doi.org/10.2172/1028994.

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