Mechanism of NO reduction by CO over Pt/SBA-15 |
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| Affiliation: | 1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, South-Central University for Nationalities, Wuhan, China;2. Department of Chemical Engineering, University of California, Santa Barbara, CA, USA;3. Department of Chemistry, Technical University of Berlin, Berlin, Germany;4. Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, USA |
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| Abstract: | 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 °C, both CO + O2 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. |
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