Nitric Oxide Decomposition Over Metal Ion-modified Cu-ZSM-5 Catalysts PDF Download
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Author: Zhang Yanping
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
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Author: Zhang Yanping
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
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Author:
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ISBN:
Category :
Languages : en
Pages : 10
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Six Cu-ZSM-5 catalysts with different Cu exchange levels were prepared according to our earlier reports. Experimental tests have suggested that the active sites of Cu-ZSM-5 catalysts for nitric oxide decomposition are square planar four-coordinated Cu{sup 2+} cations. Conversion of NO into N2 and O2 increases linearly with the amount of square planar four-coordinated Cu{sup 2+}, and the turn over frequency of the NO decomposition over the catalysts is not sensitive to total Cu ion-exchanged levels in Cu-ZSM-5 catalysts at the same experimental conditions. Cocation promoter effect in metal ion modified Cu-ZSM-5 catalyst is discussed in terms of higher turn over frequency of NO decomposition than that for Cu-ZSM-5 with the same amount of Cu exchange level. Parent ZSM-5 zeolites were dealuminated after they had been treated in a gaseous mixture of 20%H2O-4%O2-He at 750°C for 20 hours. Cu exchange process and BET measurements showed that the dealuminated ZSM-5 materials had only 15% of Cu exchange capacity and negligible micropore volume.
Author: Katie M. Leo
Publisher:
ISBN:
Category : Decomposition (Chemistry)
Languages : en
Pages : 240
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Author:
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ISBN:
Category :
Languages : en
Pages : 14
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This project investigates a suitable catalyst system for the direct nitric oxide decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in the Selective Catalytic Reduction (SCR) of NO(subscript x) to nitrogen. Therefore, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. A systematic study of water vapor effects on the structure and Cu{sup 2+} ion exchange capacity of parent ZSM-5 zeolites and on the catalytic activity of the Cu-ZSM-5 and metal ion (mg{sup 2+} and Ce{sup 3+}) modified Cu-ZSM-5 catalysts for NO decomposition has been performed during this quarter. Mg{sup 2+} and Ce{sup 3+} cocations in copper ion-exchanged ZSM-5 zeolites display a positive effect on the decomposition of nitric oxide to nitrogen and oxygen. The catalytic activity of a Cu-ZSM-5 catalyst was examined after it was exposed to different inert and oxygen-containing gas streams. The results show that the steady-state catalyst activity is not sensitive to three treatments.
Author:
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Category :
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 13
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This project investigates a suitable catalyst system for direct NO decomposition in post-combustion NO[sub x] control. Since the process does not use a reductant, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports by ion exchange. Catalysts of primary interest include Cu, Pd, Ag, and Ni exchanged zeolites. Particular emphasis is given on promoted Cu-exchanged zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, which are promising for NO conversion to nitrogen at typical flue gas O[sub 2] and NO levels and over the temperature range of 723--873K. Effects of zeolite modification, Cu exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption and reduction experiments will be carried out in a thermogravimetric analyzer and a single-particle electrodynamic balance. Kinetic studies of NO and O[sub 2] interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.
Author: Bert Sels
Publisher: Elsevier
ISBN: 0444635149
Category : Technology & Engineering
Languages : en
Pages : 475
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Book Description
Zeolites and Zeolite-like Materials offers a comprehensive and up-to-date review of the important areas of zeolite synthesis, characterization, and applications. Its chapters are written in an educational, easy-to-understand format for a generation of young zeolite chemists, especially those who are just starting research on the topic and need a reference that not only reflects the current state of zeolite research, but also identifies gaps and opportunities. The book demonstrates various applications of zeolites in heterogeneous catalysis and biomass conversion and identifies the endless possibilities that exist for this class of materials, their structures, functions, and future applications. In addition, it demonstrates that zeolite-like materials should be regarded as a living body developing towards new modern applications, thereby responding to the needs of modern technology challenges, including biomass conversion, medicine, laser techniques, and nanomaterial design, etc. The book will be of interest not only to zeolite-focused researchers, but also to a broad scientific and non-scientific audience. - Provides a comprehensive review of the literature pertaining to zeolites and zeolite-like materials since 2000 - Covers the chemistry of novel zeolite-like materials such as Metal-Organic Frameworks (MOFs), Covalent Organic Frameworks (COFs), hierarchical zeolite materials, new mesoporous and composite zeolite-like micro/mesoporous materials - Presents essential information of the new zeolite-like structures, with a balanced coverage of the most important areas of the zeolite research (synthesis, characterization, adsorption, catalysis, new applications of zeolites and zeolite-like materials) - Contains chapters prepared by known specialists who are members of the International Zeolite Association
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
This project investigates a suitable catalyst system for the direct nitric oxide decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in the Selective Catalytic Reduction (SCR) of NO(subscript x) to nitrogen. Therefore, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation of metal/zeolite catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst systems Mg/Cu-ZSM-5 and Ce/Cu-ZSM-5, which are promising for NO conversion to nitrogen at typical flue gas O2 and NO levels and over the temperature range of 673--873°C. The effect of zeolite modification, copper exchange level and catalyst preparation conditions on the catalytic activity are studied in O2-free, O2-rich gases, as well as wet (2--20% H2O) gas streams in a packed-bed microreactor. Characterization of catalysts is performed by XRD, STEM, TEM and ESR. During this quarter it was found that severe steaming (20% H2O) of Na-ZSM-5 at temperatures above 600°C caused partial vitreous glass formation and dealumination. Unpromoted Cu-ZSM-5 catalysts suffer drastic loss of NO decomposition activity in wet gas streams at 500°C. Activity is partially recovered in dry gas. Copper migration out of the zeolite channels leading to CuO formation has been identified by STEM/EDX. In Ce/Cu-ZSM-5 catalysts the wet gas activity i's greatly improved. CuO particle formation is less extensive and the dry gas activity is largely recovered upon removal of the water vapor.
Author: Oliver Kröcher
Publisher: MDPI
ISBN: 3038973645
Category : Science
Languages : en
Pages : 281
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Book Description
This book is a printed edition of the Special Issue "Selective Catalytic Reduction of NO
x" that was published in Catalysts
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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