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Deactivation And Regeneration Of Zeolite Catalysts

Author : M. Guisnet
ISBN : 9781848166370
Genre : Science
File Size : 22. 72 MB
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In chemical processes, the progressive deactivation of solid catalysts is a major economic concern and mastering their stability has become as essential as controlling their activity and selectivity. For these reasons, there is a strong motivation to understand the mechanisms leading to any loss in activity and/or selectivity and to find out the efficient preventive measures and regenerative solutions that open the way towards cheaper and cleaner processes. This book covers in a comprehensive way both the fundamental and applied aspects of solid catalyst deactivation and encompasses the state-of-the-art in the field of reactions catalyzed by zeolites. This particular choice is justified by the widespread use of molecular sieves in refining, petrochemicals and organic chemicals synthesis processes, by the large variety in the nature of their active sites (acid, base, acid-base, redox, bifunctional) and especially by their peculiar features, in terms of crystallinity, structural order and textural properties, which make them ideal models for heterogeneous catalysis. The aim of this book is to be a critical review in the field of zeolite deactivation and regeneration, by collecting a series of contributions by experts in the field which describe the factors, explain the techniques to study the causes and suggest methods to prevent (or limit) catalyst deactivation. At the same time, an anthology of commercial processes and exemplar cases provides the reader with theoretical insights and practical hints on the deactivation mechanisms and draws attention to the key role played by the loss of activity on process design and industrial practice.

Catalyst Deactivation 1994

Author : G.F. Froment
ISBN : 0080887384
Genre : Science
File Size : 35. 5 MB
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Catalyst Deactivation 1994 was an expansion of earlier, highly successful symposia. The objective of the symposium was to promote a scientific approach of the phenomenon of catalyst deactivation which will contribute to the development of catalysts which are less subject to structural transformations and more resistant to poisons and coke formation. These aspects are dealt with in 12 plenary lectures, 48 oral presentations and 35 poster papers, which were critically selected from an impressive response from some 30 countries. Both fundamental and applied aspects were covered. The deactivation of catalysts in important industrial processes like fluid bed catalytic cracking hydrotreatment, hydrodesulfurization, catalytic reforming, hydrodenitrogenation, steam reforming, hydrodemetallization, hydrocracking, Fischer-Tropsch synthesis, propane dehydrogenation, phthalic anhydride synthesis received considerable attention. Mechanisms of poisoning, sintering and coking were further investigated and modelled and new experimental techniques for the characterization and the quantification of deactivation were also introduced.

Screening Of Zeolite Catalysts For Methanol Conversion To Light Hydrocarbons

Author : James Temple Cobb
ISBN : STANFORD:36105211261289
Genre : Hydrocarbons
File Size : 47. 72 MB
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Catalyst Deactivation 2001

Author : J.J. Spivey
ISBN : 0080528686
Genre : Technology & Engineering
File Size : 52. 48 MB
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This proceedings contains the papers presented at the 9th International Symposium on Catalyst Deactivation, held in Lexington, KY, USA, on 7-10 October 2001.

Innovation In Zeolite Materials Science

Author : P. J. Grobet
ISBN : UOM:39015016029442
Genre : Technology & Engineering
File Size : 87. 78 MB
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The proceedings of this zeolite scientific meeting reflect the growing drive to discover new materials. It is evident that zeolite materials science is in a post-ZSM-5 period - pushed by a massive expansion of new compositions and topologies, and the application of new scientific tools. Four new zeolite topologies were detailed at this meeting. Important new trends were the resurgence of interest in computational and theoretical approaches to explain synthesis, sorption and catalytic data, and the increasing use of NMR and high-resolution imaging.

Catalyst Deactivation 1980 International Symposium Proceedings

Author : B. Delmon
ISBN : 9780080954325
Genre : Science
File Size : 61. 63 MB
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Catalyst Deactivation 1980: International Symposium Proceedings

Progress In Catalyst Deactivation

Author : J.L. Figueiredo
ISBN : 9789400975972
Genre : Science
File Size : 44. 53 MB
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Most catalysts used in the chemical and petrochemical indus tries are strongly affected by one or another form of deactivation, leading to poor performances and reduced life. The increasing num ber of scientific communications devoted to the subject in recent years, and culminating with an International Symposium held in Antwerp in October 1980, is a measure of the interest it arouses in both the industrial and academic communities. A stage has been reached whereby it was thought that a NATO Advanced Study Institute on "Catalyst Deactivation" might be fruit ful in establishing the state of the art and in stimulating a more systematic research on the phenomenon. Such a meeting was held ~n Lagos, Portugal, from 18 to 29 May 1981. The purpose of the Institute was to present and discuss in a didatic and systematic way the various processes that lead to cata lyst deactivation, namely coking, poisoning and solid state trans formations, and at the same time to promote the exchange of ideas and experiences among the participants, drawn from industry and uni versity. The lectures presented at the Institute are collected in this volume with the exception of Dr. L.L.Hegedus "Catalyst Poisoning", which has been previously published (Catalysis Reviews, Science md Engineering, 23, 377-476, 1981).

Zeolite Microporous Solids Synthesis Structure And Reactivity

Author : E.G. Derouane
ISBN : 9789401126045
Genre : Science
File Size : 39. 53 MB
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Intensive research on zeolites, during the past thirty years, has resulted in a deep understanding of their chemistry and in a true zeolite science, including synthesis, structure, chemical and physical properties, and catalysis. These studies are the basis for the development and growth of several industrial processes applying zeolites for selective sorption, separation, and catalysis. In 1983, a NATO Advanced Study Institute was organized in Alcabideche (portugal) to establish the State-of-the-Art in Zeolite Science and Technology and to contribute to a better understanding of the structural properties of zeolites, the configurational constraints they may exert, and their effects in adsorption, diffusion, and catalysis. Since then, zeolite science has witnessed an almost exponential growth in published papers and patents, dealing with both fundamentals issues and original applications. The proposal of new procedures for zeolite synthesis, the development of novel and sophisticated physical techniques for zeolite characterization, the discovery of new zeolitic and related microporous materials, progresses in quantum chemistry and molecular modeling of zeolites, and the application of zeolites as catalysts for organic reactions have prompted increasing interest among the scientific community. An important and harmonious interaction between various domains of Physics, Chemistry, and Engineering resulted therefrom.

Handbook Of Petroleum Processing

Author : David S. J. Jones
ISBN : 1402028199
Genre : Science
File Size : 58. 20 MB
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This handbook describes and discusses the features that make up the petroleum refining industry. It begins with a description of the crude oils and their nature, and continues with the saleable products from the refining processes, with a review of the environmental impact. There is a complete overview of the processes that make up the refinery with a brief history of those processes. It also describes design technique, operation, and, in the case of catalytic units, the chemistry of the reaction routes. These discussions are supported by calculation procedures and examples, sufficient to enable input to modern computer simulation packages.

Deactivation And Poisoning Of Catalysts

Author : J. Oudar
ISBN : 0824773381
Genre : Science
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Deactivation and Poisoning of Catalysts presents the most current research in the area of heterogeneous catalysis. It focuses on the chemically induced effects associated with bonded surface species that cause catalyst activity decline -- and in some cases a change in catalyst specificity. In addition, this volume examines poisoning of dispersed metal catalysts ... the thermodynamics of sulfur-metal and carbon-metal interactions ... model poisoning reactions on single crystals ... deactivation in petroleum refining and petrochemical processes ... coking of metal catalysts ... and more. The new approaches and solutions to catalyst deactivation and poisoning presented in this guide are invaluable to all heterogeneous catalysis specialists, including chemical and petroleum engineers, and surface, synthetic, physical, and industrial chemists. Book jacket.

Abstracts Of Papers American Chemical Society

Author : American Chemical Society. Meeting
ISBN : UCAL:B4534069
Genre : Chemistry
File Size : 24. 40 MB
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Advances In Catalysis

Author :
ISBN : 0080475779
Genre : Science
File Size : 54. 86 MB
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Catalysis is the acceleration of a chemical reaction by a catalyst, a substance that notably affects the rate of a chemical reaction without itself being consumed or altered. Since 1948, Advances in Catalysis has filled the gap between the papers that report on and the textbooks that teach in the diverse areas of catalysis research. The editors of and contributors to Advances in Catalysis are dedicated to recording progress in this area. * Provides a comprehensive review of all aspects of catalytic research * Contains in-depth, critical, state-of-the-art reports

Basic Principles In Applied Catalysis

Author : Manfred Baerns
ISBN : 3540402616
Genre : Science
File Size : 22. 40 MB
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Written by a team of internationally recognized experts, this book addresses the most important types of catalytic reactions and catalysts as used in industrial practice. Both applied aspects and the essential scientific principles are described. The main topics can be summarized as follows: heterogeneous, homogeneous and biocatalysis, catalyst preparation and characterization, catalytic reaction engineering and kinetics, catalyst deactivation and industrial perspective.

Dissertation Abstracts International

Author :
ISBN : STANFORD:36105020022336
Genre : Dissertations, Academic
File Size : 32. 73 MB
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Catalyst Deactivation 1997

Author : G.A. Fuentes
ISBN : 008052866X
Genre : Technology & Engineering
File Size : 83. 33 MB
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Catalyst Deactivation 1997 focused on 9 key topical areas: carbon deposition and coke formation, chemicals, environmental catalysis, modeling, petroleum processing, poisoning, syngas conversion, techniques, and thermal degradation. All of these areas were well represented at the meeting; moreover, several review articles were presented that provide perspectives on new research and development thrusts. The proceedings of the meeting are organized with six review and award articles at the front of the volume followed by topical articles a keynote, 5-6 oral, and 2-3 poster papers. A list of authors is provided at the end of the book. It should be emphasized that all of the papers were ranked and reviewed by members of the Scientific Committee.

Decalin Dehydrogenation For In Situ Hydrogen Production To Increase Catalytic Cracking Rate Of N Dodecane

Author : Christopher Bruening
ISBN : OCLC:1040694190
Genre : Catalysis
File Size : 83. 35 MB
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Catalytic cracking of paraffinic hydrocarbons is a widely utilized industrial process, but catalyst deactivation over time requires regeneration or replacement of the catalyst bed. A gaseous hydrogen co-feed can be used to promote hydrocracking and decrease deactivation of the catalyst due to coke formation or active site poisoning. One potential alternative approach to extend the lifetime of a cracking catalyst is to generate molecular hydrogen in-situ via catalytic dehydrogenation of a cycloparaffin. In this effort, studies were performed using model compounds to investigate the impact of catalyst configuration and operating conditions on overall performance. For the purpose of this testing, decalin was selected as a model cycloparaffin, with n-dodecane used as a model n-paraffin compound. A blended cycloparaffin/n-paraffin feed was studied in a dual catalyst flow reactor system, containing both a dehydrogenation and cracking catalyst. Testing was performed with either the dehydrogenation catalyst upstream or with the two catalysts physical mixed. Products and reactant conversion rates from these studies were compared to those from a baseline n-paraffin cracking study, with no cycloparaffin or dehydrogenation catalyst present.Several commercially available Zeolite catalysts were initially screened for n-dodecane cracking activity to identify an appropriate cracking catalyst for further study. A Zeolite Y catalyst provided adequate n-dodecane reactivity for observation of reactor configuration impact. Prior to the dual-bed and mixed-bed studies, a synthesized Pt/Al2O3 dehydrogenation catalyst was studied independently with neat decalin feed as well as a blended decalin/n-dodecane feed, for the purpose of determining appropriate reactor conditions to be used in subsequent testing. Using the selected Zeolite Y catalyst, extended duration testing was performed at 400℗ʻC and 500 psig to characterize the activity and deactivation rate for n-dodecane cracking, to provide a baseline for subsequent comparison. Similar testing was performed with the Zeolite Y catalyst to investigate the impact of blending decalin or naphthalene with the normal paraffin.A dual-bed reactor configuration utilized the Pt/Al2O3 dehydrogenation catalyst in-line and upstream of the Zeolite Y catalyst, with a 1:1 volumetric blend of decalin/n-dodecane at 400℗ʻC and 500 psig. The dehydrogenation bed successfully promoted decalin dehydrogenation for generating in-situ molecular hydrogen. However, minimal initial n-dodecane conversion was observed, which was speculated to be due to strong adsorption of naphthalene dehydrogenation product onto the Zeolite Y catalyst, reducing the number of available active sites. After 240 minutes, n-dodecane conversion in the dual-bed reactor system was higher than the baseline, while decalin conversion was very high for the entire duration. In a mixed bed configuration, the two catalyst beds were physically mixed with identical testing conditions. This configuration was intended to reduce the absolute naphthalene concentration on the Zeolite Y catalyst and eliminate the inhibition which occurred in the dual bed configuration. The mixed bed configuration promoted higher initial conversion and lower deactivation rate compared to all other feed/reactor configurations. Overall, it was determined that catalytic dehydrogenation of a cycloparaffin can be successfully employed to increase conversion of a normal paraffin in a catalytic cracking reactor, although future work could further optimize catalyst selection/loading, reactor configuration, and reaction conditions.

Catalysis By Microporous Materials

Author : H.K. Beyer
ISBN : 0080544673
Genre : Technology & Engineering
File Size : 82. 49 MB
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ZEOCAT '95 is the eleventh in the series of symposia devoted to special fields of zeolite chemistry. Six plenary lectures, forty oral and forty-two poster presentations were included in the program. The accepted papers cover every aspect of catalysis on microporous materials. A significant number of the contributions describe the synthesis, modification, instrumental and chemical characterisation of zeolites and other micro- and mesoporous materials. Catalytic reactions involve hydrocarbon cracking, nucleophilic aromatic substitution, methanol to hydrocarbon conversion, hydration of acetylene, various alkylation reactions, redox transformations, Claisen rearrangement, etc.

Methane And Its Derivatives

Author : Sunggyu Lee
ISBN : 082479754X
Genre : Science
File Size : 48. 2 MB
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"Covers the chemistry, process chemistry, technology, engineering, and economics of methane conversion, including its environmental impact and commercial exploitation. Begins with methane's availability and increasing importance as an environmentally acceptable natural resource alternative and feedstock."

Journal Of The Indian Chemical Society

Author : Indian Chemical Society
ISBN : UCLA:L0080408909
Genre : Chemistry
File Size : 85. 66 MB
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Indian Journal Of Chemistry

Author :
ISBN : UOM:39015058897722
Genre : Chemistry
File Size : 67. 23 MB
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