Journal
CATALYSIS COMMUNICATIONS
Volume 50, Issue -, Pages 69-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2014.02.027
Keywords
Pt/SBA-15; in situ IR spectroscopy; CO plus NO; Isocyanate; Reaction mechanism
Categories
Funding
- National Natural Science Foundation of China [21203254]
- Special Fund of the Central University Research, South-Central University for Nationalities [CZZ11007, 12ZNZ006]
- Scientific Research Foundation for Returned Scholars
- Ministry of Education of China [BZY11055]
- German Research Foundatio [TH 1463/5-1]
- US Department of Energy [DE-FG02-03ER15467]
- U.S. Department of Energy (DOE) [DE-FG02-03ER15467] Funding Source: U.S. Department of Energy (DOE)
- Office Of The Director
- Office Of Internatl Science &Engineering [0968399] Funding Source: National Science Foundation
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The mechanism of the CO + NO reaction catalyzed by Pt/SBA-15 was studied via independent investigations of CO oxidation and NO disproportionation. Below 400 degrees C, both CO + O-2 and CO + NO reactions approach 100% conversion, while the catalyst shows negligible activity for NO disproportionation. These results suggest that CO oxidation by atomic oxygen arising from NO dissociation is not a major route for CO2 formation in the CO + NO reaction. In situ IR spectra reveal the formation of isocyanates (NCO-) adsorbed on silica. Their surface concentration changes with the extent of the CO + NO reaction. A mechanism is proposed in which isocyanates are reaction intermediates. (C) 2014 Elsevier B.V. All rights reserved.
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