Platinum Particle Size and Support Effects in NOx Mediated Carbon Oxidation over Platinum Catalysts

Platinum metal was dispersed on microporous, mesoporous, and nonporous support materials including the zeolites Na-Y, Ba-Y, Ferrierite, ZSM-22, ETS-10, and AlPO-11, alumina, and titania. The oxidation of carbon black loosely mixed with catalyst powder was monitored gravimetrically in a gas stream co...

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Bibliographic Details
Published in:Environmental science & technology 2006-04, Vol.40 (8), p.2727-2733
Main Authors: VILLANI, Kenneth, VERMANDEL, Walter, SMETS, Koen, LIANG, Duoduo, VAN TENDELOO, Gustaaf, MARTENS, Johan A.
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Carbon
Catalysis
Catalysts
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Nitric oxide
Oxidation
Particle size
Platinum
Pollution
Prevention and purification methods
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Transports and other
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Summary:Platinum metal was dispersed on microporous, mesoporous, and nonporous support materials including the zeolites Na-Y, Ba-Y, Ferrierite, ZSM-22, ETS-10, and AlPO-11, alumina, and titania. The oxidation of carbon black loosely mixed with catalyst powder was monitored gravimetrically in a gas stream containing nitric oxide, oxygen, and water. The carbon oxidation activity of the catalysts was found to be uniquely related to the Pt dispersion and little influenced by support type. The optimum dispersion is around 3-4% corresponding to relatively large Pt particle sizes of 20-40 nm. The carbon oxidation activity reflects the NO oxidation activity of the platinum catalyst, which reaches an optimum in the 20-40 nm Pt particle size range. The lowest carbon oxidation temperatures were achieved with platinum loaded ZSM-22 and AlPO-11 zeolite crystallites bearing platinum of optimum dispersion on their external surfaces. [PUBLICATION ABSTRACT]
ISSN:0013-936X
1520-5851
DOI:10.1021/es051871h