Effect of Low Concentration of SO x on NO Reduction with Propene Over Ag/Al2O3

Catalytic activity for NO reduction with propene was investigated at 0–80 ppm SO2. NO was reduced more efficiently by propene on SO2-treated than untreated catalyst. Simultaneously, combustion of reductant was observed to lower NO reduction efficiency. Thus, the role of surface-adsorbed SOx species...

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Bibliographic Details
Published inCatalysis letters Vol. 132; no. 1-2; pp. 116 - 121
Main Authors Ouyang, Feng, Zhu, Huaixin Liu Rongshu
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Nature B.V 01.09.2009
Subjects
Activation
Aldehydes
Aluminum oxide
Ammonia
Catalysis
Catalysts
Catalytic activity
Combustion
Reduction
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Summary:Catalytic activity for NO reduction with propene was investigated at 0–80 ppm SO2. NO was reduced more efficiently by propene on SO2-treated than untreated catalyst. Simultaneously, combustion of reductant was observed to lower NO reduction efficiency. Thus, the role of surface-adsorbed SOx species was regarded as depressing reductant combustion. NH3 adsorption revealed that SO2 treatment increased Bronsted acidity of the Ag/Al2O3 catalyst, which promoted propene activation. Reductant activation is a more important step, compared with NO activation to oxidative nitrate species. The NCO species, an index intermediate in NOx reduction, was produced on SO2-adsorbed Ag/Al2O3 at a lower temperature (473 K) than on the untreated catalyst. The reductive intermediates at low temperature are suggested to be alcohol, or aldehyde-adsorbed species, based on observed C=O band.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-009-0079-8