Photocatalytic Conversion Of Methane And Reduction Of Co2 With H2o
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Photocatalytic Conversion Of Methane And Reduction Of Co2 With H2o
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Author : Xiang Yu
language : en
Publisher:
Release Date : 2019
Photocatalytic Conversion Of Methane And Reduction Of Co2 With H2o written by Xiang Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Photocatalysis is one of the key technologies for clean energy and environmental applications. The number of applications based on photocatalysis has increased dramatically for the past two decades. Photocatalytic activation of C-H bonds is an emerging field. Methane is a promising source of energy with a huge reserve and is considered to be one of the alternatives to non-renewable petroleum resources because it can be converted to valuable hydrocarbon feedstocks and hydrogen through appropriate reactions. However, due to its high stability, high energy is usually consumed for its conversion, which remains a problem to be solved. Methane conversion and reaction mechanism occurring on metal-heteropolyacid-titania nanocomposites were investigated in Chapters 3 and 4. Oxidation of methane has been carried out for more than a century. Since oxygen is a very reactive molecule, methane can react very rapidly with molecular oxygen and is prone to total oxidation till CO2. Therefore, it is difficult to obtain a desired product with high yield and high selectivity. We report here direct and selective photocatalytic highly-selective oxidation of methane to carbon monoxide under ambient conditions. The composite catalysts on the basis of zinc, tungstophosphoric acid and titania exhibit exceptional performance in this reaction, high carbon monoxide selectivity and quantum efficiency of 7.1% at 362 nm. The reaction is consistent with the Mars-Van Krevelen type sequence and involves formation of the surface methoxy-carbonates as intermediates and zinc oxidation-reduction cycling. In the past few decades, extensive research has focused on the direct conversion of methane to alcohols or higher hydrocarbons. The current processes of converting methane to alcohols or olefins are complex and expensive, because they require an intermediate step of reforming methane to syngas. Although the direct conversion of methane to more valuable products has significant environmental and potential commercial value, there is no commercial scale process available. We uncovered highly selective (>90%) quantitative photochemical direct conversion of methane to ethane at ambient temperature over silver-heteropolyacid-titania nanocomposites. The ethane yield from methane reaches 9 % on the optimized materials. High quantum efficiency, high selectivity and significant yield of ethane combined with excellent stability are major advantages of methane quantitative synthesis from methane using the photochemical looping approach. The rise in atmospheric carbon dioxide and the depletion of fossil fuel reserves have raised serious concerns about the subsequent impact of CO2 on the global climate and future energy supply. The use of abundant solar energy to convert carbon dioxide into fuel, such as carbon monoxide, methane or methanol, solves both problems simultaneously and provides a convenient method of energy storage. Chapter 5 addresses a new efficient catalyst for selective CO2 to CO conversion. The zinc containing phosphotungstic acid-titania nanocomposites exhibited exceptional high activity reaching 50 μmol CO/g·h and selectivity (73%) in the CO2 photocatalytic reduction to CO in the presence of water. The in-situ IR experiments suggest that reaction involves zinc bicarbonates containing hydroxyl groups. The decomposition of these zinc bicarbonate species under irradiation leads to the selective production of carbon monoxide and oxygen. In photocatalytic reactions, the difference in catalyst morphology usually has a significant effect on the photocatalytic performance. Chapter 6 studied the effect of monoclinic bismuth vanadate (BiVO4) crystals with controlled ratio of {010} and {110} facets for photocatalytic reduction of CO2 by H2O. The reaction under irradiation is significantly enhanced by selective photo-deposition of Cu and Co co-catalysts over different facets providing Z-scheme charge flow.
New And Future Developments In Catalysis
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Author : Naveed Ahmed
language : en
Publisher: Elsevier Inc. Chapters
Release Date : 2013-07-11
New And Future Developments In Catalysis written by Naveed Ahmed and has been published by Elsevier Inc. Chapters this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-07-11 with Science categories.
Co2 Conversion And Utilization
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Author : Chunshan Song
language : en
Publisher: ACS Symposium
Release Date : 2002
Co2 Conversion And Utilization written by Chunshan Song and has been published by ACS Symposium this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Science categories.
This book focuses on the chemistry and processes for conversion and utilization of carbon dioxide. Topics include CO 2 utilization, its conversion to industrial chemicals and fuels, its coversion via synthesis gas, and new catalysts and chemical processes for conversion.
Conversion Of Carbon Dioxide Into Hydrocarbons Vol 1 Catalysis
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Author : Inamuddin
language : en
Publisher: Springer Nature
Release Date : 2020-01-01
Conversion Of Carbon Dioxide Into Hydrocarbons Vol 1 Catalysis written by Inamuddin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-01 with Science categories.
This book presents the catalytic conversion of carbon dioxide into various hydrocarbons and other products using photochemical, electrochemical and thermo-chemical processes. Products include formate, formic acid, alcohols, lower and higher hydrocarbons, gases such as hydrogen, carbon monoxide and syngas.
Solar Energy Mediated Methane Conversion Over Nanometal And Semiconductor Catalysts
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Author : Hui Song
language : en
Publisher: Springer Nature
Release Date : 2020-11-30
Solar Energy Mediated Methane Conversion Over Nanometal And Semiconductor Catalysts written by Hui Song and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-30 with Science categories.
This book demonstrates that solar energy, the most abundant and clean renewable energy, can be utilized to drive methane activation and conversion under mild conditions. The book reports that coupling solar energy and thermal energy can significantly enhance methane conversion at mild temperatures using plasmonic nanometal-based catalysts, with a substantial decrease in apparent activation energy of methane conversion. Furthermore, this book, for the first time, reports the direct photocatalytic methane oxidation into liquid oxygenates (methanol and formaldehyde) with only molecular oxygen in pure water at room temperature with high yield and selectivity over nanometals and semiconductors (zinc oxide and titanium dioxide). These findings are a big stride toward methane conversion and inspire researchers to develop strategies for efficient and selective conversion of methane to high-value-added chemicals under mild conditions.
The Chemistry Of Co2 And Tio2
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Author : Svatopluk Civiš
language : en
Publisher: Springer
Release Date : 2019-07-06
The Chemistry Of Co2 And Tio2 written by Svatopluk Civiš and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-06 with Science categories.
This book provides a comprehensive overview of the chemistry of CO2 in relation to surface interactions and photocatalytic transformation by UV radiation. The first part deals with the modelling of an anatase surface, its interaction with CO2, and the spontaneous exchange of oxygen atoms between the gas and solid phases. The book then naturally transitions to the photocatalytic reduction of CO2, achieved by adding UV radiation and traces of water to the experimental system, to produce methane and CO. This photocatalytic reduction is explained in detail and the implications for planetary chemistry (specifically concerning Mars), as well as Earth’s atmospheric chemistry and global warming, are discussed.
Photocatalytic Conversion Of Co2 With H2o Over Pt Tio2 Nanoparticles
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Author : Yan Wang
language : en
Publisher:
Release Date : 2014
Photocatalytic Conversion Of Co2 With H2o Over Pt Tio2 Nanoparticles written by Yan Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Carbon dioxide categories.
Carbon Dioxide Reduction Through Advanced Conversion And Utilization Technologies
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Author : Yun Zheng
language : en
Publisher: CRC Press
Release Date : 2019-05-03
Carbon Dioxide Reduction Through Advanced Conversion And Utilization Technologies written by Yun Zheng and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-03 with Science categories.
Carbon Dioxide Reduction through Advanced Conversion and Utilization Technologies covers fundamentals, advanced conversion technologies, economic feasibility analysis, and future research directions in the field of CO2 conversion and utilization. This book emphasizes principles of various conversion technologies for CO2 reduction such as enzymatic conversion, mineralization, thermochemical, photochemical, and electrochemical processes. It addresses materials, components, assembly and manufacturing, degradation mechanisms, challenges, and development strategies. Applications of conversion technologies for CO2 reduction to produce useful fuels and chemicals in energy and industrial systems are discussed as solutions to reduce greenhouse effects and energy shortages. Particularly, the advanced materials and technology of high temperature co-electrolysis of H2O and CO2 to produce sustainable fuels using solid oxide cells (SOCs) are reviewed and the introduction, fundamentals, and some significant topics regarding this CO2 conversion process are discussed. This book provides a comprehensive and clear picture of advanced technologies in CO2 conversion and utilization. Written in a clear and detailed manner, it is suitable for students as well as industry professionals, researchers, and academics.
Green Carbon Dioxide
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Author : Gabriele Centi
language : en
Publisher: John Wiley & Sons
Release Date : 2014-01-17
Green Carbon Dioxide written by Gabriele Centi and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-17 with Technology & Engineering categories.
PROMISING NEW APPROACHES TO RECYCLE CARBON DIOXIDE AND REDUCE EMISSIONS With this book as their guide, readers will learn a variety of new approaches and methods to recycle and reuse carbon dioxide (CO2) in order to produce green fuels and chemicals and, at the same time, minimize CO2 emissions. The authors demonstrate how to convert CO2 into a broad range of essential products by using alternative green energy sources, such as solar, wind, and hydro-power as well as sustainable energy sources. Readers will discover that CO2 can be a driving force for the sustainable future of both the chemical industry and the energy and fuels industry. Green Carbon Dioxide features a team of expert authors, offering perspectives on the latest breakthroughs in CO2 recycling from Asia, Europe, and North America. The book begins with an introduction to the production of CO2-based fuels and chemicals. Next, it covers such topics as: Transformation of CO2 to useable products through free-radical-induced reactions Hydrogenation of CO2 to liquid fuels Direct synthesis of organic carbonates from CO2 and alcohols using heterogeneous oxide catalysts Electrocatalytic reduction of CO2 in methanol medium Fuel production from photocatalytic reduction of CO2 with water using TiO2-based nanocomposites Use of CO2 in enhanced oil recovery and carbon capture and sequestration More than 1,000 references enable readers to explore individual topics in greater depth. Green Carbon Dioxide offers engineers, chemists, and managers in the chemical and energy and fuel industries a remarkable new perspective, demonstrating how CO2 can play a significant role in the development of a sustainable Earth.
Advances In Co2 Capture Sequestration And Conversion
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Author : Fangming Jin
language : en
Publisher: ACS Symposium
Release Date : 2016-04
Advances In Co2 Capture Sequestration And Conversion written by Fangming Jin and has been published by ACS Symposium this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04 with Science categories.
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