Deposition-precipitation versus anionic-exchange Au/Al2O3 catalysts: a comparative investigation towards the selective reduction of NOx

TitleDeposition-precipitation versus anionic-exchange Au/Al2O3 catalysts: a comparative investigation towards the selective reduction of NOx
Publication TypeJournal Article
Year of Publication2012
AuthorsNguyen, DL, Umbarkar, SB, Dongare, MK, Lancelot, C, Girardon, JS, Dujardin, C, Granger, P
JournalCatalysis Communications
Volume26
Pagination225-230
Date PublishedSEP
ISSN1566-7367
KeywordsAnionic-exchange, Au catalyst, Deposition-precipitation, NOx abatement, Selective catalytic reduction
Abstract

Catalytic properties of supported gold catalysts on gamma-Al2O3 prepared by a conventional deposition-precipitation method were compared with those obtained by anionic-exchange for the reduction of NOx by hydrocarbon under lean conditions that simulate Diesel engine exhaust gas. Interestingly, a catalytic activity enhancement is observed after thermal ageing under reactive conditions at 500 degrees C on anionic-exchanged samples which make them suitable for practical developments. On the other hand, the reverse trend is observed on the solids prepared by deposition-precipitation which deactivate at low temperature. Such changes in catalytic properties have been tentatively explained on the basis of textural and structural modifications taking place during thermal ageing under wet atmosphere. (C) 2012 Elsevier B.V. All rights reserved.

DOI10.1016/j.catcom.2012.06.004
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)2.915
Divison category: 
Catalysis and Inorganic Chemistry