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

• Published in: Catalysis letters Vol. 132; no. 1-2; pp. 116 - 121
• Main Authors: Ouyang, Feng, Zhu, Huaixin Liu Rongshu
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.09.2009; Springer
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Industrial Chemistry/Chemical Engineering; Organometallic Chemistry; Physical Chemistry; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Propene; SO; Promotion; NO reduction; Aluminium oxide; Nitrogen oxide; Binary compound; Catalytic reaction; Alcohol; Acidity; Activation; Combustion; Nitrates; Aldehyde; Chemical reduction; Ammonia; Heterogeneous catalysis; Adsorption; Efficiency; Oxidation; Alumina; Catalyst; Low temperature
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-009-0079-8

Catalytic activity for NO reduction with propene was investigated at 0–80 ppm SO 2 . NO was reduced more efficiently by propene on SO 2 -treated than untreated catalyst. Simultaneously, combustion of reductant was observed to lower NO reduction efficiency. Thus, the role of surface-adsorbed SO x species was regarded as depressing reductant combustion. NH 3 adsorption revealed that SO 2 treatment increased Bronsted acidity of the Ag/Al 2 O 3 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 NO x reduction, was produced on SO 2 -adsorbed Ag/Al 2 O 3 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.