期刊
CATALYSIS TODAY
卷 158, 期 3-4, 页码 228-234出版社
ELSEVIER
DOI: 10.1016/j.cattod.2010.03.023
关键词
H-2-SCR; Bronsted acid; Pt/Al-MCM-41
资金
- National Natural Science Foundation of China [20973094, 20703057]
- National Basic Research Program of China [2009CB623502]
- International S&T Cooperation Program of China (ISCP) [2007DFA90720]
Al species can be introduced to the framework of Si-MCM-41 support by isomorphous substitution or wet impregnation and Bronsted acid sites can be created in Al-MCM-41. Pt catalysts supported on Si-MCM-41 and Al-MCM-41 are studied for the selective catalytic reduction of NO by hydrogen in excess oxygen. The introduction of Al species to MCM-41 at suitable Si/Al ratio shows great promotion effect on H-2-SCR over Pt/MCM-41. Pt catalyst supported on Al-MCM-41 prepared by isomorphous substitution with the Si/Al ratio of 10 exhibits the best catalytic performance and ca. 80% NOx conversion as well as ca. 85% N-2 selectivity can be achieved at 140 degrees C at high GHSV of 80,000 h(-1). The H-2-SCR reaction over Pt/Al-MCM-41, together with Pt/Si-MCM-41, are investigated by means of in situ DRIFT spectra and the existence of Bronsted acid sites in Al-MCM-41 is found to play a decisive role on the H-2-SCR reaction pathway. (C) 2010 Elsevier B.V. All rights reserved.
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