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Nature of active sites in decane-SCR-NOx and NO decomposition over Cu-ZSM-5 zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
44687 46052 2006 9 PDF Available
Title
Nature of active sites in decane-SCR-NOx and NO decomposition over Cu-ZSM-5 zeolites
Abstract

Decane-SCR-NOx in the presence of water vapor and NO decomposition were investigated over Cu ions exchanged in ZSM-5 zeolites with various Si/Al and Al distribution. The local environment of the Cu ions in cationic sites was characterized by the combination of 29Si MAS NMR, Vis–NIR spectroscopy of Cu(II) ions, Cu(I) Vis emission spectroscopy and UV–Vis spectroscopy of Co(II) ions as probes for the presence of Al pairs in the framework. The Cu(II) ions coordinated to four framework oxygens of the α- or β-type cationic sites containing Al-O-(Si-O)2-Al sequences represent the most active sites in decane-SCR-NOx. On contrary, the Cu(I) ions coordinated to two or three framework oxygens and located at the channel intersection adjacent to the single Al atoms in the α- or β-site control predominantly reaction of NO decomposition.

Keywords
NO decomposition; SCR-NOx; Cu-ZSM-5; Al distribution
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Nature of active sites in decane-SCR-NOx and NO decomposition over Cu-ZSM-5 zeolites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 307, Issue 1, 12 June 2006, Pages 156–164
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Any Questions? feel free to contact us