Modification of Titanium Dioxide Support for Carbon Monoxide Oxidation PDF Download
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Author:
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 212
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Book Description
This research is to study the effect of surface modification of TiO2 support on the catalytic activity in CO oxidation. Two methods were employed for surface modification of TiO2 support: the creation of defective sites on TiO2 surface and the modification with trace element. The results found that the presence of higher amount of Ti3+ on the larger crystallite size TiO2 stabilizes small metal particles during impregnation, calcination, and reduction steps via stronger metal-support interaction; hence higher CO oxidation activities. In addition, the modification of TiO2 support with trace element can improve the CO oxidation activity. All of element dopants (i.e., Al, Si and P), the Si-modified TiO2 showed the highest catalytic performance of Ag/TiO2 catalyst. However, there existed an optimum content of Si/Ti molar ratio at ca. 0.05-0.1 which resulted in an improved catalytic activity of Ag/TiO2 in CO oxidation. There was no improvement in CO oxidation activity of the Ag/TiO2 catalyst when the Si/Ti was further increased to 0.3 due probably to the formation of amorphous SiO2 instead of the Ti-O-Si bond. The P-modified TiO2 supported Ag catalysts using phosphorus precursor in the form of oxide promoted the weak adsorbed oxygen species and resulted in catalytic activity improvement in CO oxidation.
Author:
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 212
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Book Description
This research is to study the effect of surface modification of TiO2 support on the catalytic activity in CO oxidation. Two methods were employed for surface modification of TiO2 support: the creation of defective sites on TiO2 surface and the modification with trace element. The results found that the presence of higher amount of Ti3+ on the larger crystallite size TiO2 stabilizes small metal particles during impregnation, calcination, and reduction steps via stronger metal-support interaction; hence higher CO oxidation activities. In addition, the modification of TiO2 support with trace element can improve the CO oxidation activity. All of element dopants (i.e., Al, Si and P), the Si-modified TiO2 showed the highest catalytic performance of Ag/TiO2 catalyst. However, there existed an optimum content of Si/Ti molar ratio at ca. 0.05-0.1 which resulted in an improved catalytic activity of Ag/TiO2 in CO oxidation. There was no improvement in CO oxidation activity of the Ag/TiO2 catalyst when the Si/Ti was further increased to 0.3 due probably to the formation of amorphous SiO2 instead of the Ti-O-Si bond. The P-modified TiO2 supported Ag catalysts using phosphorus precursor in the form of oxide promoted the weak adsorbed oxygen species and resulted in catalytic activity improvement in CO oxidation.
Author: John Achu Moma
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 460
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Book Description
Author: Sher Bahadar Khan
Publisher: BoD – Books on Demand
ISBN: 178985475X
Category : Science
Languages : en
Pages : 158
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Book Description
This book enlightens the type, chemical structure, and application of photo-catalysts. It covers the recent developments in photo-catalysts and their applications, particularly in photo-catalytic degradation of different organic pollutants, hydrogen production, etc. It provides a concise but complete coverage and overview of photocatalysts and their recent advances for a broad audience: beginners, graduate students, and specialists in both academic and industrial sectors.
Author: R. T. K. Baker
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 258
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Book Description
Author: Aline Auroux
Publisher: Springer Science & Business Media
ISBN: 3642119549
Category : Technology & Engineering
Languages : en
Pages : 569
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Book Description
The book is about calorimetry and thermal analysis methods, alone or linked to other techniques, as applied to the characterization of catalysts, supports and adsorbents, and to the study of catalytic reactions in various domains: air and wastewater treatment, clean and renewable energies, refining of hydrocarbons, green chemistry, hydrogen production and storage. The book is intended to fill the gap between the basic thermodynamic and kinetics concepts acquired by students during their academic formation, and the use of experimental techniques such as thermal analysis and calorimetry to answer practical questions. Moreover, it supplies insights into the various thermal and calorimetric methods which can be employed in studies aimed at characterizing the physico-chemical properties of solid adsorbents, supports and catalysts, and the processes related to the adsorption desorption phenomena of the reactants and/or products of catalytic reactions. The book also covers the basic concepts for physico-chemical comprehension of the relevant phenomena. Thermodynamic and kinetic aspects of the catalytic reactions can be fruitfully investigated by means of thermal analysis and calorimetric methods, in order to better understand the sequence of the elemental steps in the catalysed reaction. So the fundamental theory behind the various thermal analysis and calorimetric techniques and methods also are illustrated.
Author: A. Guerrero-Ruiz
Publisher: Elsevier
ISBN: 0080539742
Category : Technology & Engineering
Languages : en
Pages : 501
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Book Description
"Spillover and Mobility of Species and Solid Surfaces" collects the papers which were presented at the Fifth International Conference Spillover, either as oral or poster contributions, as well as the summaries of the invited lectures. This congress and its publication in the Studies on Surface Science and Catalysis series follow the tradition of previous conferences on spillover, initiated in Lyon, 1983, and continued in Leipzig, 1989, Kyoto 1993 and Dalian, 1997. For the fifth conference, held in S.L. el Escorial (Madrid), the organising committee has attempted to compile representative contributions which illustrate the advances in understanding the spillover phenomenon since 1997. Spillover is a process taking place during the interface of gas reactant molecules (mainly hydrogen and oxygen) on solid surfaces. However, different contributions to the more general area of the chemistry at surfaces, related with the mobility and migration of species, diffusion through membranes, fuel cell catalysts, etc., have also been included. In fact the title of the present volume summarizes this attempt to extend the conference topics towards dynamics at surfaces.Among the 70 contributions received, the 56 accepted papers were selected on the basis of the reports of at least two international reviewers, according to standards comparable to those applied for other specialised journals. These papers are from 21 different countries.
Author: Hyun-Ku Rhee
Publisher: Elsevier
ISBN: 0080456510
Category : Technology & Engineering
Languages : en
Pages : 951
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Book Description
This Proceedings of APCRE'05 contains the articles that were presented at the 4th Asia-Pacific Chemical Reaction Engineering Symposium (APCRE'05), held at Gyeongju, Korea between June 12 and June 15, 2005, with a theme of "New Opportunities of Chemical Reaction Engineering in Asia-Pacific Region". Following the tradition of APCRE Symposia and ISCRE, the scientific program encompassed a wide spectrum of topics, including not only the traditional areas but also the emerging fields of chemical reaction engineering into which the chemical reaction engineers have successfully spearheaded and made significant contributions in recent years. In addition to the 190 papers being accepted, six plenary lectures and 11 invited lectures are placed in two separate chapters in the front.* Provides an overview of new developments and application in chemical reaction engineering* Topics include traditional and emerging fields * Papers reviewed by experts in the field
Author: Mon Wei Lin
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 102
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Book Description
Author: David R. Schryer
Publisher:
ISBN:
Category : Carbon dioxide lasers
Languages : en
Pages : 432
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Book Description
Author: James Spivey
Publisher: Royal Society of Chemistry
ISBN: 1788017749
Category : Science
Languages : en
Pages : 246
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Book Description
Catalysts are required for a variety of applications and researchers are increasingly challenged to find cost effective and environmentally benign catalysts to use. This volume looks at modern approaches to catalysis and reviews the extensive literature. Chapters highlight reactions active under oxidative coupling of methane conditions and how they are interlinked, heterogeneous nickel catalysts and their use in laboratory and industry, the reaction mechanism of heterogeneous catalysis with the surface science probe, the concepts of electroless deposition (ED) methods for preparation of true bimetallic catalysts, the general subject of metal-support interactions occurring over ruthenium-based catalysts and benzene as the target volatile organic compound (VOC). Appealing broadly to researchers in academia and industry, these illustrative chapters bridge the gap from academic studies in the laboratory to practical applications in industry not only for catalysis field but also for environmental protection. The book will be of great benefit to any researcher wanting a succinct reference on developments in this area now and looking to the future.
