Multiphase Catalysts for Selective Reduction of NOx with Hydrocarbons PDF Download
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Author: Sergio Eduardo Maisuls
Publisher:
ISBN: 9789036514293
Category :
Languages : en
Pages : 132
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Book Description
Author: Sergio Eduardo Maisuls
Publisher:
ISBN: 9789036514293
Category :
Languages : en
Pages : 132
Get Book Here
Book Description
![Metal Loaded MCM-41 Catalysts for Selective Reduction of NOx “[NO Tief X]” with Hydrocarbons PDF](https://books.google.com/books/content/images/frontcover/EelINAEACAAJ?fife=w80-h100)
Author: Walter Schießer
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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The original goal of this program was the identification and design of new noble-metal-based catalysts for the selective catalytic reduction of nitric oxide by hydrocarbons under excess oxygen (i.e., ''lean'') conditions (HC-SCR). Work conducted in the first funding cycle of this award (i.e., 1997-2000) was successful in allowing us to develop an understanding of the fundamental surface chemistry taking place during the adsorption and reaction of nitrogen oxides and propylene on the surface of supported noble metal catalysts. Both experimental results collected in our own group as well as molecular simulation results published by Professor Neurock suggested that in order to improve the performance of the Pt catalysts--in terms of the nitrogen selectivity and the temperature window of operation-- it was necessary to introduce a second metal. However, synthesizing such catalysts with the metals of interest (i.e., Pt-Au, Pt-Ru, Pt-Rh, etc.) with some degree of control of the structure and composition of the resulting supported metal particles is in itself a research challenge. Consequently, the bulk of our efforts during the second funding cycle of this award (covered by this report) was shifted to the use of organometallic cluster precursors for the synthesis on novel bimetallic catalysts. During this time we have also continued to maintain an interest in NOx abatement, but have redirected our efforts from the HC-SCR process to the more promising from a commercial standpoint NOx Storage Reduction (NSR) approach.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Recent developments in catalytic control of NOx are revealing the significance of NO2 as an intermediary for achieving higher NOx removal efficiencies. This paper discusses the combination of the plasma with a catalyst to improve the selective reduction of NOx under lean-burn conditions. It is shown that the main effect of the plasma is to enhance the gas-phase oxidation of NO to NO2. The reduction of NOx to N2 is then accomplished by the heterogeneous reaction of NO2 with activated hydrocarbons on the catalyst surface. By using a plasma, one can take advantage of a new class of catalysts that are potentially more durable, more active, more selective and more sulfur-tolerant compared to conventional lean-NOx catalysts. The plasma-assisted catalytic reduction process can be implemented with any type of plasma reactor and does not require a specific type of electrical power supply. It can also easily accommodate any type of catalyst support structure.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Novel bifunctional catalysts combining two active phases, typically Cu-ZSM-5 and a modifier, were prepared and tested for the selective catalytic reduction of nitrogen oxides using propylene in order to overcome the hindering effects of water typically seen for single-phase catalysts such as Cu-ZSM-5. The catalysts were made by typical preparation techniques, but parameters could be varied to influence the catalyst. The physical characterization of the materials showed that the modification phase was added strictly to the external surface of the zeolite without hindering any internal surface area. Chemical characterization by temperature programmed reactions, DRIFTS and x-ray absorption spectroscopy indicated strong interaction between the two phases, primarily producing materials that exhibited lower reduction temperatures. Two improvements in NOx reduction activity (1000 ppm NO, 1000 ppm C3H6, 2% O2, 30,000 hr-1 GHSV) were seen for these catalysts compared with Cu- ZSM-5: a lower temperature of maximum NOx conversion activity (as low at 250 C), and an enhancement of activity when water was present in the system. The use of a second phase provides a way to further tune the properties of the catalyst in order to achieve mechanistic conditions necessary to maximize NOx remediation.
Author: C. J. Hill
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Luca Lietti
Publisher: Royal Society of Chemistry
ISBN: 1788013239
Category : Science
Languages : en
Pages : 514
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Book Description
This book will be the first to comprehensively present the current research on catalysts used for NOx abatement in lean exhausts.
Author: Zeynep Ilsen Önsan
Publisher: John Wiley & Sons
ISBN: 1118115767
Category : Technology & Engineering
Languages : en
Pages : 395
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Book Description
Provides a holistic approach to multiphase catalytic reactors from their modeling and design to their applications in industrial manufacturing of chemicals Covers theoretical aspects and examples of fixed-bed, fluidized-bed, trickle-bed, slurry, monolith and microchannel reactors Includes chapters covering experimental techniques and practical guidelines for lab-scale testing of multiphase reactors Includes mathematical content focused on design equations and empirical relationships characterizing different multiphase reactor types together with an assortment of computational tools Involves detailed coverage of multiphase reactor applications such as Fischer-Tropsch synthesis, fuel processing for fuel cells, hydrotreating of oil fractions and biofuels processing
Author: William L. Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author: U. Deka
Publisher:
ISBN:
Category :
Languages : en
Pages :
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