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Mechanism of NO reduction by CO over Pt/SBA-15

Paper ID Volume ID Publish Year Pages File Format Full-Text
50039 46777 2014 4 PDF Available
Title
Mechanism of NO reduction by CO over Pt/SBA-15
Abstract

•Pt/SBA-15 is active for CO + O2 and CO + NO reactions, but not for NO disproportionation.•The change in isocyanate surface concentration correlates well with the CO + NO activity of the catalyst.•Isocyanates are intermediates in the CO + NO reaction over Pt/SBA-15 catalyst•A mechanism for CO + NO reaction over Pt/SBA-15 is proposed.

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.

Graphical abstractTwo possible reaction routes for the CO + NO reaction conducted on a Pt/SBA-15 catalystFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pt/SBA-15; in situ IR spectroscopy; CO + NO; Isocyanate; Reaction mechanism
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Mechanism of NO reduction by CO over Pt/SBA-15
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 50, 5 May 2014, Pages 69–72
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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