期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 147, 期 -, 页码 864-870出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.09.047
关键词
Hydrocarbon SCR; NOx; Au/Pd; Mechanistic study
资金
- Deanship of Scientific Research, King Abdulaziz University, Jeddah, Saudi Arabia [D-005/431]
- Department of Employment and Learning, Northern Ireland
The ability of a gold palladium bimetallic catalyst to selectively oxidise toluene has been used to enhance the hydrocarbon selective catalytic reduction of NOx, a reaction in which the interaction of partial oxidation intermediates is considered important. The combination of gold with palladium has a synergistic effect, producing a catalyst that is more active for NOx conversion than the arithmetic sum of the corresponding mono-metallic materials. Three regimes in the conversion profile of the AuPd catalyst are proposed relating to production and consumption of toluene derived species, such as benzaldehyde and benzonitrile. The possible role of these reaction intermediates in the toluene HC-SCR reaction is examined. Using (NO)-N-15, the formation of N-2 and N2O is observed via the direct interaction between the nitrogen atom of benzonitrile and (NO)-N-15. The higher activity of the bimetallic catalyst for the NOx reduction reaction by toluene is discussed in the context of these partial oxidation intermediates. (C) 2013 Elsevier B.V. All rights reserved.
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