On The Performance Of Oxidation Catalysts And Scr Catalysts In The Presence Of Alkali Compounds Representative Of Biofuel Contaminants

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On the Performance of Oxidation Catalysts and SCR Catalysts in the Presence of Alkali Compounds Representative of Biofuel Contaminants

Author : Yiquan Xie
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis On the Performance of Oxidation Catalysts and SCR Catalysts in the Presence of Alkali Compounds Representative of Biofuel Contaminants by : Yiquan Xie

Download or read book On the Performance of Oxidation Catalysts and SCR Catalysts in the Presence of Alkali Compounds Representative of Biofuel Contaminants written by Yiquan Xie and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to global lean exhaust gas and new emission regulations, exhaust after-treatment systems of diesel engines are getting more and more sophisticated and comprise a series of catalytic units. In the present work, two of these catalytic systems were studied, Diesel Oxidation Catalysts (DOC) and Selective Catalytic Reduction (SCR) catalysts. Particular attention is paid to their performance in the presence of alkali compounds when bio-diesel is utilized as the alternative fuel.Firstly, this thesis focuses on the catalytic behavior of the Diesel Oxidation Catalyst using different aging characteristics of road mileage in order to improve the efficiency of an ammonia SCR system on an after-treatment line composed by a DOC + DPF + SCR. The studied catalyst is a commercial diesel oxidation catalyst (Pt/Pd/Al2O3) provided by Continental. Hydrothermal aging under different conditions on carrots of monolith were performed. Also studied in the monolith form over the commercial DOC, the influence of the addition of different alkali metal species (K and Na) on the commercial DOC through catalytic tests performed on this structured catalyst under multicomponent (C3H6 / CO / NO / NO2) co-feeding conditions was explored. Aiming at investigating the effects of the presence of different alkali metal species on the DOC at the level of active phase, homemade bimetallic DOC is prepared and then different alkali metal species incorporated. Finally, encouraged by the evident influence of alkali compounds on DOCs, their impacts on the downstream SCR catalysts are also studied in this thesis. The studied SCR catalyst is a commercial V2O5-based catalyst provided by UMICORE company.

Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts

Author : Isabella Nova
Publisher : Springer Science & Business Media
ISBN 13 : 1489980717
Total Pages : 715 pages
Book Rating : 4.4/5 (899 download)

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Book Synopsis Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts by : Isabella Nova

Download or read book Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts written by Isabella Nova and published by Springer Science & Business Media. This book was released on 2014-03-14 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts presents a complete overview of the selective catalytic reduction of NOx by ammonia/urea. The book starts with an illustration of the technology in the framework of the current context (legislation, market, system configurations), covers the fundamental aspects of the SCR process (catalysts, chemistry, mechanism, kinetics) and analyzes its application to useful topics such as modeling of full scale monolith catalysts, control aspects, ammonia injections systems and integration with other devices for combined removal of pollutants.

Novel Catalysts in Advanced Oxidation of Organic Pollutants

Author : Süheyda Atalay
Publisher : Springer
ISBN 13 : 3319289500
Total Pages : 69 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Novel Catalysts in Advanced Oxidation of Organic Pollutants by : Süheyda Atalay

Download or read book Novel Catalysts in Advanced Oxidation of Organic Pollutants written by Süheyda Atalay and published by Springer. This book was released on 2016-01-27 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: This brief summarizes the role of certain catalysts and associated processes that are involved in the reduction or elimination of hazardous substances from wastewater and the exploitation of renewable raw materials. The authors begin by providing a summary of the most recent developments in catalysts used in the advanced oxidation of organic pollutants in aqueous phase. Advanced Oxidation Processes (AOPS) are described in terms of homogeneous and heterogeneous catalysts. Some emphasis is placed on the role nanocatalysts, perovskite-type catalysts, and green catalysts play in several AOPs such as Fenton Chemistry, photocatalytic oxidation, and the hybrid technologies that combine different processes. Catalyst preparation, characterization, reaction chemistry, and process technology are described. Specific wastewater case studies which illustrate the role of these catalysts in AOPs completes the brief.

Testing Novel Water Oxidation Catalysts for Solar Fuels Production

Author : Carminna Ottone
Publisher : Springer
ISBN 13 : 9783030127114
Total Pages : 117 pages
Book Rating : 4.1/5 (271 download)

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Book Synopsis Testing Novel Water Oxidation Catalysts for Solar Fuels Production by : Carminna Ottone

Download or read book Testing Novel Water Oxidation Catalysts for Solar Fuels Production written by Carminna Ottone and published by Springer. This book was released on 2019-05-06 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers comprehensive information on the main techniques for measuring water-oxidation-catalyst (WOC) performance, with a particular focus on the combined use of sacrificial oxidants and dyes within closed-batch reactors. It provides an overview of the latest advances in the synthesis of more efficient WOCs, followed by an analysis of the requirements for sustainable energy production. Readers will find a detailed description of the reaction mechanism used in catalyst assessment systems, which reveals the benefits and limitations of the most common sacrificial oxidant/dye pair. Experimental techniques including electrochemical methods for characterizing novel and non-photoactive WOCs are also described. Throughout the book, various manganese oxides are used as examples of the techniques reviewed or proposed systems. Cost considerations and technological perspectives of the scale-up of solar-driven hydrogen production are also addressed. Lastly, the book presents lessons learned from the implementation of a large-scale real-world device.

Catalysis and Automotive Pollution Control IV

Author : N. Kruse
Publisher : Elsevier
ISBN 13 : 0080528619
Total Pages : 719 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Catalysis and Automotive Pollution Control IV by : N. Kruse

Download or read book Catalysis and Automotive Pollution Control IV written by N. Kruse and published by Elsevier. This book was released on 1998-05-29 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: In spite of the energy crises and the recession, there has been a global, explosive growth in the amount of motor vehicles. In the past 50 years, the amount has increased from 50 to 700 million vehicles. For economical reasons they will probably continue to be used for a considerable number of years, despite the poor yield of internal combustion engines resulting in the inevitable production of some gaseous pollutants. The subsequent increase of gaseous pollutants in our atmosphere caused by exhaust gas from automobiles has enhanced the problem of the elimination of these pollutants produced by internal combustion engines. Catalysis has proven to be the best solution to lower the content of exhaust gas in pollutants. As its predecessors, CAPoC4 proved to be a suitable platform for discussing technological improvements and developments along with future perspectives and challenges. In the light of new results and further legislative regulations, the following topics were intensely discussed: *low light-off behaviour based on improved catalysts and substrate formulations *efficient adsorber systems for storage of hydrocarbon emissions *electrically heated catalyst systems ahead the main catalyst or, alternatively, close coupled catalysts (at the manifold of the engine) • lean DeNOx catalysts allowing for decomposition of NOx in the oxygen-rich exhaust of direct injection gasoline engines and high speed injection diesel engines or, alternatively, NOx trapping/reduction in a hybrid approach * collection and destruction of dry particulates or soot. There is no doubt that clean vehicle technology is a vital part of improving air quality. Challenges remain and call for technological answers. Catalytic air pollution control is still an area providing a considerable incentive for innovative work.

Frontiers of Green Catalytic Selective Oxidations

Author : Konstantin P. Bryliakov
Publisher : Springer Nature
ISBN 13 : 9813297514
Total Pages : 295 pages
Book Rating : 4.8/5 (132 download)

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Book Synopsis Frontiers of Green Catalytic Selective Oxidations by : Konstantin P. Bryliakov

Download or read book Frontiers of Green Catalytic Selective Oxidations written by Konstantin P. Bryliakov and published by Springer Nature. This book was released on 2019-10-02 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for novel efficient and environmentally sustainable chemo, regio- and stereoselective catalyst systems for the oxidation of organic substrates is continuously growing in line with toughening economic and environmental constraints. This book addresses these issues; it consists of eleven chapters written by world-recognized experts in green and sustainable oxidation catalysis. The most urgent and challenging topics, in the judgment of the editor, such as green asymmetric epoxidations, sulfoxidatiuons, C–H oxidations; oxidation catalysis by polyoxometalates and oxidations in non-conventional solvents, etc. have been critically reviewed in this book. Both fundamental aspects, such as catalysts design, catalytic properties, nature of catalytically active sites and reaction mechanisms, and practical outlook of the oxidations have been addressed by the authors. The book appeals to a broad readership, particularly graduate students, employees of universities and research organizations, and industrial researchers, particularly those working in the areas of homogeneous oxidation catalysis, asymmetric synthesis, organocatalysis, sustainable catalytic processes and green chemistry, mechanisms of catalytic reactions, synthesis of bioactive compounds, biomimetic chemistry, etc. Konstantin Bryliakov is Leading Researcher at the Boreskov Institute of Catalysis. In 2016, he was elected Honorary Professor of the Russian Academy of Sciences.

Catalytic Oxidation of Hydrocarbons

Author : Karl C. Stein
Publisher :
ISBN 13 :
Total Pages : 1200 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Catalytic Oxidation of Hydrocarbons by : Karl C. Stein

Download or read book Catalytic Oxidation of Hydrocarbons written by Karl C. Stein and published by . This book was released on 1963 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of High Performance SCR-catalysts Related to Different Fuel Types (DEVCAT)

Author :
Publisher :
ISBN 13 : 9789279481437
Total Pages : 164 pages
Book Rating : 4.4/5 (814 download)

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Book Synopsis Development of High Performance SCR-catalysts Related to Different Fuel Types (DEVCAT) by :

Download or read book Development of High Performance SCR-catalysts Related to Different Fuel Types (DEVCAT) written by and published by . This book was released on 2015 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the DEVCAT project, high performance high-dust SCR catalysts related to different fuels have been developed, leading to an improved understanding of chemical and physical mechanisms of the reactions at the catalyst. The main focus was put on the development of commercial SCR catalysts for the application in coal-, biomass- and co-combustion derived flue gas with high DeNOx-activity and low SO2/SO3-conversion being able to convert a significantly high share of flue gas elemental mercury into its oxidised form. Oxidised mercury is subsequently absorbed in wet flue gas desulphurisation. Catalysts with different composition including the addition of new metal oxides as well as nano-material and modified geometry have been produced and were tested in micro-, technical-, bench- and full-scale SCR-reactors. The enhanced properties of the newly developed catalysts were demonstrated for all scales consistently. Interactions of relevant pollutants at the catalyst have been identified. Deactivation of newly developed catalysts in flue gas of coaland co-combustion plants was shown to be similar to conventional catalysts. In addition, the regeneration process of heavily deactivated catalysts was studied. A 3D-CFD SCR model was further developed and validated including the processes of deactivation and lifetime behaviour. The model was calibrated with experimental data generated within the project. The model allows the prediction of the distribution of flue gas components from the boiler up to downstream of the catalyst. The widespread and holistic research approach included measurements at lab- and full-scale FGDs in order to identify interactions leading to overall efficient multi-pollutant control.

Catalysts for the Control of Automotive Pollutants

Author : James Edward McEvoy
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Catalysts for the Control of Automotive Pollutants by : James Edward McEvoy

Download or read book Catalysts for the Control of Automotive Pollutants written by James Edward McEvoy and published by . This book was released on 1975 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of Nitric Oxide Oxidation Catalysts for the Fast SCR Reaction

Author : Mark Crocker
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Development of Nitric Oxide Oxidation Catalysts for the Fast SCR Reaction by : Mark Crocker

Download or read book Development of Nitric Oxide Oxidation Catalysts for the Fast SCR Reaction written by Mark Crocker and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was undertaken in order to assess the potential for oxidizing NO to NO{sub 2} in flue gas environments, with the aim of promoting the so-called fast SCR reaction. In principle this can result in improved SCR kinetics and reduced SCR catalyst volumes. Prior to commencing experimental work, a literature study was undertaken to identify candidate catalysts for screening. Selection criteria comprised (1) proven (or likely) activity for NO oxidation, (2) low activity for SO2 oxidation (where data were available), and (3) inexpensive component materials. Catalysts identified included supported base metal oxides, supported and unsupported mixed metal oxides, and metal ion exchanged ZSM-5 (Fe, Co, Cu). For comparison purposes, several low loaded Pt catalysts (0.5 wt% Pt) were also included in the study. Screening experiments were conducted using a synthetic feed gas representative of flue gas from coal-fired utility boilers: [NO] = 250 ppm, [SO{sub 2}] = 0 or 2800 ppm, [H{sub 2}O] = 7%, [CO{sub 2}] = 12%, [O{sub 2}] = 3.5%, balance = N{sub 2}; T = 275-375 C. Studies conducted in the absence of SO{sub 2} revealed a number of supported and unsupported metal oxides to be extremely active for NO oxidation to NO{sub 2}. These included known catalysts (Co{sub 3}O{sub 4}/SiO{sub 2}, FeMnO{sub 3}, Cr{sub 2}O{sub 3}/TiO{sub 2}), as well as a new one identified in this work, CrFeO{sub x}/SiO{sub 2}. However, in the presence of SO{sub 2}, all the catalysts tested were found to be severely deactivated with respect to NO oxidation. Of these, Co{sub 3}O{sub 4}/SiO{sub 2}, Pt/ZSM-5 and Pt/CeO{sub 2} showed the highest activity for NO oxidation in the presence of SO{sub 2} (based on peak NO conversions to NO{sub 2}), although in no cases did the NO conversion exceed 7%. Reactor studies indicate there are two components to SO{sub 2}-induced deactivation of Co{sub 3}O{sub 4}/SiO{sub 2}, corresponding to an irreversible deactivation due to sulfation of the surface of the Co{sub 3}O{sub 4} phase, together with a reversible inhibition due to competitive adsorption of SO{sub 2} with NO on the catalyst. In an effort to minimize the deactivating effect of SO{sub 2} on Co{sub 3}O{sub 4}/SiO{sub 2}, two synthetic approaches were briefly examined. These consisted of (1) the incorporation of highly dispersed Co(II) ions in silica, as a non-sulfating matrix, via the sol-gel preparation of CoO-SiO{sub 2}; and (2) the sol-gel preparation of a mixed metal oxide, CoO-Nb{sub 2}O{sub 5}-SiO{sub 2}, with the aim of exploiting the acidity of the niobium oxide to minimize SO2 adsorption. While both catalysts showed almost no activity for NO oxidation in the absence of SO{sub 2}, when SO{sub 2} was present low activity was observed, indicating that SO{sub 2} acts as a promoter for NO oxidation over these materials. The kinetics of NO oxidation over Co{sub 3}O{sub 4}/SiO{sub 2}, Pt/SiO{sub 2} and Pt/CeO{sub 2} were also examined. Co{sub 3}O{sub 4}/SiO{sub 2} was found to exhibit a higher apparent activation energy for NO oxidation than the Pt catalysts, while the combined reaction order in NO and O{sub 2} for the three catalysts was very close to one. CO{sub 2} was found to have no effect on the kinetics of NO oxidation over these catalysts. The presence of H{sub 2}O caused a decrease in NO conversion for both Co{sub 3}O{sub 4}/SiO{sub 2} and Pt/CeO{sub 2} catalysts, while no effect was observed for Pt/SiO{sub 2}. The inhibiting effect of water was reversible and is attributed to competitive adsorption with the reactants. In sum, this study has shown that a variety of base metal catalysts are very active for NO oxidation. However, all of the catalysts studied are strongly deactivated in the presence of 2800 ppm SO{sub 2} at typical flue gas temperatures; consequently improving catalyst resistance to SO{sub x} will be a pre-requisite if the fast SCR concept is to be applied to coal-fired flue gas conditions.

THE EMISSION AND PARTICULATE MATTER OXIDATION PERFORMANCE OF A SCR CATALYST ON A DIESEL PARTICULATE FILTER WITH A DOWNSTREAM SCR

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (114 download)

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Book Synopsis THE EMISSION AND PARTICULATE MATTER OXIDATION PERFORMANCE OF A SCR CATALYST ON A DIESEL PARTICULATE FILTER WITH A DOWNSTREAM SCR by :

Download or read book THE EMISSION AND PARTICULATE MATTER OXIDATION PERFORMANCE OF A SCR CATALYST ON A DIESEL PARTICULATE FILTER WITH A DOWNSTREAM SCR written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Selective catalytic reduction (SCR) systems along with a NH3 slip control catalyst (ASC) offers NOx conversion efficiency >90 % with NH3 slip 90 % with NH3 slip 95 %. A downstream SCR catalyst substrate can be used to get additional NOx conversion by using the SCRF® outlet NH3 to increase the cumulative NOx conversion of the system. In this study, NOx reduction, NH3 slip and PM oxidation performance of a Cu-zeolite SCRF® with a downstream Cu-zeolite SCR were investigated based on engine experimental data at steady state conditions. The experimental data were collected at varying SCRF® inlet temperatures, space velocities, inlet NOx concentrations, NO2/ NOx ratios at ammonia to NOx ratios (ANR) between 1.02 to 1.10. The results demonstrated that the SCRF® with downstream SCR together can achieve NOx conversion efficiency > 98% at ANRs between 1.02 - 1.10 (which may have been due to measurement inaccuracies in downstream SCRF 98% at ANRs between 1.02 - 1.10 (which may have been due to measurement inaccuracies in downstream SCRF®/SCRdata), for the inlet temperature range of 200 - 370°C, space velocity in the range of 10 to 34 k/hr and inlet NO2/ NOx in the range of 0.3 - 0.5. However, NH3 slip from the SCRF® decreases and NOx concentration downstream of the SCRF® increases with the oxidation of PM in the SCRF®. The PM oxidation kinetics are affected by the deNOx reactions, hence, the SCRF® with urea dosing showed ~80 % lower reaction rates during passive oxidation when compared to the production CPF. The effect of varying fuel rail injection pressure on the primary particle diameter and on the Elemental Carbon (EC) and Organic Carbon (OC) fraction of the total carbon was also studied. The primary particle diameter was found to be in the range of 28-30 nm with no effect of the variation in fuel rail injection pressure on it. The OC part of the Total Carbon (TC) did not vary significantly with fuel rail injection pressure. The EC content increased with decrease in fuel rail injection pressure.

Catalytic Control of Air Pollution

Author : Ronald G. Silver
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Catalytic Control of Air Pollution by : Ronald G. Silver

Download or read book Catalytic Control of Air Pollution written by Ronald G. Silver and published by . This book was released on 1992 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dozen papers from a colloid and surface chemistry symposium at the August 1991 meeting of the American Chemical Society in New York. They explore the chemistry of catalyst systems used to control air pollution from automobiles and industries, and review recent emission control legislation. For graduate and professional chemical engineers. Annotation copyrighted by Book News, Inc., Portland, OR

Demonstration of Selective Catalytic Reduction (SCR) Technology for the Control of Nitrogen Oxide (NO Sub X) Emissions from High-sulfur Coal-fired Boilers

Download Demonstration of Selective Catalytic Reduction (SCR) Technology for the Control of Nitrogen Oxide (NO Sub X) Emissions from High-sulfur Coal-fired Boilers PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Demonstration of Selective Catalytic Reduction (SCR) Technology for the Control of Nitrogen Oxide (NO Sub X) Emissions from High-sulfur Coal-fired Boilers by :

Download or read book Demonstration of Selective Catalytic Reduction (SCR) Technology for the Control of Nitrogen Oxide (NO Sub X) Emissions from High-sulfur Coal-fired Boilers written by and published by . This book was released on 1991 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project is to demonstrate and evaluate commercially available Selective Catalytic Reduction (SCR) catalysts from US, Japanese and European catalyst suppliers on a high-sulfur US coal-fired boiler. SCR is a post-combustion nitrogen oxide (NOx) control technology that involves injecting ammonia into the flue gas generated from coal combustion in an electric utility boiler. The flue gas containing ammonia is then passed through a reactor that contains a specialized catalyst. In the presence of the catalyst, the ammonia reacts with NOx to convert it to nitrogen and water vapor, Although SCR is widely practiced in Japan and Europe, there are numerous technical uncertainties associated with applying SCR to US coals. These uncertainties include: (1) potential catalyst deactivation due to poisoning by trace metal species present in US coals that are not present in other fuel performance of the technology and effects on the balance-of-plant equipment in the presence of high amounts of SO2 and SO3. (3) performance of a wide variety of SCR catalyst compositions, geometries and methods of manufacture under typical high-sulfur coal-fired utility operating conditions. These uncertainties will be explored by constructing a series of small-scale SCR reactors and simultaneously exposing different SCR catalysts to flue gas derived from the combustion of high sulfur US coal.

Frontiers of Green Catalytic Selective Oxidations

Author : Konstantin P. Bryliakov
Publisher :
ISBN 13 : 9789813297524
Total Pages : 295 pages
Book Rating : 4.2/5 (975 download)

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Book Synopsis Frontiers of Green Catalytic Selective Oxidations by : Konstantin P. Bryliakov

Download or read book Frontiers of Green Catalytic Selective Oxidations written by Konstantin P. Bryliakov and published by . This book was released on 2019 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for novel efficient and environmentally sustainable chemo, regio- and stereoselective catalyst systems for the oxidation of organic substrates is continuously growing in line with toughening economic and environmental constraints. This book addresses these issues; it consists of eleven chapters written by world-recognized experts in green and sustainable oxidation catalysis. The most urgent and challenging topics, in the judgment of the editor, such as green asymmetric epoxidations, sulfoxidatiuons, C-H oxidations; oxidation catalysis by polyoxometalates and oxidations in non-conventional solvents, etc. have been critically reviewed in this book. Both fundamental aspects, such as catalysts design, catalytic properties, nature of catalytically active sites and reaction mechanisms, and practical outlook of the oxidations have been addressed by the authors. The book appeals to a broad readership, particularly graduate students, employees of universities and research organizations, and industrial researchers, particularly those working in the areas of homogeneous oxidation catalysis, asymmetric synthesis, organocatalysis, sustainable catalytic processes and green chemistry, mechanisms of catalytic reactions, synthesis of bioactive compounds, biomimetic chemistry, etc. Konstantin Bryliakov is Leading Researcher at the Boreskov Institute of Catalysis. In 2016, he was elected Honorary Professor of the Russian Academy of Sciences.

Catalytic Wet Oxidation of Organic Rich Aqueous Fraction Derived from Biomass Thermochemical Processing with Novel Char Catalysts in Microscale Based Reactors

Download Catalytic Wet Oxidation of Organic Rich Aqueous Fraction Derived from Biomass Thermochemical Processing with Novel Char Catalysts in Microscale Based Reactors PDF Online Free

Author : Iva Jovanovic Tews
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.8/5 (454 download)

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Book Synopsis Catalytic Wet Oxidation of Organic Rich Aqueous Fraction Derived from Biomass Thermochemical Processing with Novel Char Catalysts in Microscale Based Reactors by : Iva Jovanovic Tews

Download or read book Catalytic Wet Oxidation of Organic Rich Aqueous Fraction Derived from Biomass Thermochemical Processing with Novel Char Catalysts in Microscale Based Reactors written by Iva Jovanovic Tews and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of alternative fuel refineries, in order to improve global sustainability through increased biofuel production, has been increasingly supported by both government and private companies. Thermochemical processes such as hydrothermal liquefaction (HTL) and pyrolysis are leading technologies in this area. However, characterization, treatment, and reuse of aqueous by-products produced by such processes have received little attention. This dissertation is focused on aqueous phase characterization and catalytic advanced oxidation processing in novel microscale reactors. Novel char catalysts and improved process design were developed for efficient removal of organic contaminants. Small acids, cyclic pentenes, and carboxylic compounds such as phenol were initially identified. Model compounds were chosen based on these findings, and catalytic wet oxidation (CWO) processes in batch reactors conducted, in order to obtain reaction rate kinetics. The mechanism of compound oxidation was developed and shown through DFT analysis to be a production of hydroxyl free radicals (OH0́) in the presence of an oxidant and the N-doped char catalyst. The OH0́ free radicals readily react with the dissolved organic compound, which was further confirmed with a FeO-N-doped char catalysts in a modified Fenton-like reaction system. In order to better develop a treatment processes which could integrate with a biorefinery, all process engineering experiments were conducted in a continuous solid-catalyzed microscale-based reactor utilizing the FeO-N-doped char catalyst. Time scale analysis was used for reactor geometry optimization in an effort to reduce diffusion time. The design led to a parallel plate reactor with channel depth of 500 microns. Thermochemical aqueous phases produced by pilot scale processes were characterized in detailed by extensive analytical methods. Traditional methods of spectroscopic analysis were limited in the ability to identify more complex oligomeric compounds and thus newer methods such as ICR-MS were utilized. The aqueous phases were successfully treated by the novel catalyst in the microreactor with removal of over 70% total organic carbon present at atmospheric pressure and at 90 ℗ʻC. Some aqueous phase samples were more complex in nature however, successful decontamination was achieved. Catalytic wet oxidation processing in microscale-based reactors proves to be a plausible treatment option for process water in biorefineries.

Catalytic Removal of Volatile Organic Compounds

Author : Jean-François Lamonier
Publisher : MDPI
ISBN 13 : 3038422134
Total Pages : 1 pages
Book Rating : 4.0/5 (384 download)

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Book Synopsis Catalytic Removal of Volatile Organic Compounds by : Jean-François Lamonier

Download or read book Catalytic Removal of Volatile Organic Compounds written by Jean-François Lamonier and published by MDPI. This book was released on 2018-09-28 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Catalytic Removal of Volatile Organic Compounds" that was published in Catalysts

Oxidation Catalysts on Alkaline Earth Supports

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (982 download)

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Book Synopsis Oxidation Catalysts on Alkaline Earth Supports by :

Download or read book Oxidation Catalysts on Alkaline Earth Supports written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An oxidation catalyst includes a support including particles of an alkaline earth salt, and first particles including a palladium compound on the support. The oxidation catalyst can also include precious metal group (PMG) metal particles in addition to the first particles intermixed together on the support. A gas permeable polymer that provides a continuous phase can completely encapsulate the particles and the support. The oxidation catalyst may be used as a gas sensor, where the first particles are chemochromic particles.