Author: Polina YasenevaPublisher:
ISBN:
Category :
Languages : en
Pages : 388
Book Description
Selective Oxidation of Methanol on Mixed Oxide Catalysts
Author: Polina YasenevaHandbook Of Advanced Methods And Processes In Oxidation Catalysis: From Laboratory To Industry
Author: Daniel DuprezPublisher: World Scientific
ISBN: 1783263342
Category : Science
Languages : en
Pages : 1035
Book Description
This book offers a comprehensive overview of the most recent developments in both total oxidation and combustion and also in selective oxidation. For each topic, fundamental aspects are paralleled with industrial applications. The book covers oxidation catalysis, one of the major areas of industrial chemistry, outlining recent achievements, current challenges and future opportunities. One distinguishing feature of the book is the selection of arguments which are emblematic of current trends in the chemical industry, such as miniaturization, use of alternative, greener oxidants, and innovative systems for pollutant abatement. Topics outlined are described in terms of both catalyst and reaction chemistry, and also reactor and process technology.
Selective Oxidation Over Mixed Metal Oxide Catalysts
Author: Selective Oxidation of Methanol on VSbO Sub 4 Catalysts
Author: I. PeshevaMetal Oxides in Heterogeneous Catalysis
Author: Jacques C. VedrinePublisher: Elsevier
ISBN: 0128116323
Category : Technology & Engineering
Languages : en
Pages : 620
Book Description
Metal Oxides in Heterogeneous Catalysis is an overview of the past, present and future of heterogeneous catalysis using metal oxides catalysts. The book presents the historical, theoretical, and practical aspects of metal oxide-based heterogeneous catalysis. Metal Oxides in Heterogeneous Catalysis deals with fundamental information on heterogeneous catalysis, including reaction mechanisms and kinetics approaches.There is also a focus on the classification of metal oxides used as catalysts, preparation methods and touches on zeolites, mesoporous materials and Metal-organic frameworks (MOFs) in catalysis. It will touch on acid or base-type reactions, selective (partial) and total oxidation reactions, and enzymatic type reactions The book also touches heavily on the biomass applications of metal oxide catalysts and environmentally related/depollution reactions such as COVs elimination, DeNOx, and DeSOx. Finally, the book also deals with future trends and prospects in metal oxide-based heterogeneous catalysis. Presents case studies in each chapter that provide a focus on the industrial applications Includes fundamentals, key theories and practical applications of metal oxide-based heterogeneous catalysis in one comprehensive resource Edited, and contributed, by leading experts who provide perspectives on synthesis, characterization and applications
Selective Methane Oxidation Over Promoted Oxide Catalysts. Quarterly Report, March--May 1994
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
Experimental work aiming at developing active catalysts for selective oxidation of methane to methanol was started in this quarter. Some of the experiments used a double catalyst bed design and with H2O as cofeed. The first catalyst bed, which serves as CH3 radical generator, was chosen to be 1 wt % SO42−/Sr/La2O3, as this catalyst exhibits remarkable activity and selectivity at lower temperature (500°C--550°C). A few transition metal oxides were used as the second catalyst bed to react with CH3 to form CH3O−M species, which was then hydrolyzed to form CH3OH. It was found that unsupported metal oxides ZrO2, Y2O3, SrO; Fe2O3, MnO2, Cr2O3, CaO, and MgO did not produce CH3OH between 430°C and 600°C when used as the only catalysts, while MoO3 supported on silica produced CH30H in the temperature range of 430°C--480°C under the current single-bed reactor configuration. However, when the double-bed configuration was used with the 1 wt % SO42−/Sr/La2O3 as the first methyl radical generating catalyst bed, CH30H was observed when ZrO2and Y2O3 were used as the second bed catalysts. Preliminary quantitative analysis showed that the ability of producing CH3OH was in the order of unsupported Y2O3> unsupported ZrO2> MoO3 on silica. For all of these cases, the CH3OH space time yield was within a dozen grams per kilogram catalyst per hour.
Oxygen in Catalysis
Author: Adam BielanskiPublisher: CRC Press
ISBN: 1482293285
Category : Science
Languages : en
Pages : 489
Book Description
A description of catalytic systems commonly used as model systems in the laboratory and as industrial catalysts in large-scale operations, and a discussion of the mechanisms operating in these reactions. Attempts to describe the elementary steps by quantum chemical methods are also shown, as are rec
Theoretical Insights Into the Selective Oxidation of Methane to Methanol
Author: Allegra LatimerPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
While the search for catalysts capable of directly converting methane to higher value commodity chemicals and liquid fuels has been active for over a century, a viable industrial process for selective methane activation has yet to be developed. Generally, this failure has been attributed to two primary difficulties: (1) the high barriers required to activate methane (activity), and (2) the higher activity of the C-H bonds in methanol compared to methane (selectivity). In this thesis, we delve into both of these problems and identify general frameworks and strategies that can be used in future research to identify promising catalyst materials. First, we show that, for the wide range of catalysts that proceed via a radical intermediate, a unifying framework for predicting C-H activation barriers using a single universal descriptor can be established. We combine this scaling approach with a thermodynamic analysis of active site formation to provide a map of methane activation rates, and successfully rationalize the available empirical data across catalyst classes. We then extend this analysis to catalysts that proceeed via a surface-stabilized transition state for methane activation. We present a framework for predicting the transition state's geometry (radical or surface-stabilized) and its approximate energy on a given active site. We then shift our attention to understanding and optimizing selectivity. First, we determine the principles guiding the selectivity of a related reaction, direct methanol to formaldehyde on ruthenium oxide catalysts, and find that limiting electrophilic surface oxygen coverage for this reaction is key to obtaining high selectivity. Next, recognizing that a precise and general quantification of the limitations of catalytic direct methane to methanol has not yet been established, we present a simple kinetic model to explain the selectivity-conversion tradeoff that hampers continuous partial oxidation of methane to methanol. Stemming from this analysis, we suggest several design strategies for increasing methanol yields under the constraint of the selectivity-conversion tradeoff. These strategies include (1) "collectors, " materials with strong methanol adsorption potential that can help to lower the partial pressure of methanol in the gas phase, (2) aqueous reaction conditions, and/or (3) diffusion-limited systems. Having identified these strategies, we work towards realizing a system capitalizing on (2), aqueous reaction conditions, by collaborating with experimental colleagues to develop a low-temperature electrochemical approach for methane oxidation. It is the general aim of this thesis to develop straightforward, accessible models with the help of Density Functional Theory that yield generalizable insights. We are hopeful that the models presented herein may provide a reliable framework for future researchers working to understand and evaluate new catalysts and processes for the direct oxidation of methane to methanol.
Heterogeneous Catalysis of Mixed Oxides
Author: Makoto MisonoPublisher: Elsevier Inc. Chapters
ISBN: 0128081082
Category : Science
Languages : en
Pages : 51
Book Description
A concise introduction is given to the fundamental knowledge required to understand the heterogeneous catalysis of mixed oxides and to the concept of catalyst design. The fundamental knowledge includes the rate versus equilibrium relation; rate equation; the mechanism of catalytic reaction; essential functions of a catalyst, namely, activity, selectivity, and durability (or life); and catalytic reaction engineering such as mass and heat transfer. Typical methods for the preparation and characterization of catalysts and for the elucidation of the reaction mechanism, as well as a short history of industrial catalysts, are also provided.
New Mixed Oxide Catalysts for the Decomposition of Methanol ...
Author: Frank Caleb KeltonPublisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 168
Book Description