Promoting Effect of Pt Addition to V2O5/ZrO2 Catalyst on Reduction of NO by C3H6 |
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| Authors: | Takashi Ohno Eiji Tanaka Fumikazu Hatayama Yoshio Toda Hisashi Miyata |
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| Affiliation: | (1) Department of Biofunctional Chemistry, Kobe University, Nada, Kobe, 657-8501, Japan;(2) Department of Industrial Chemistry, Osaka Prefectural College of Technology, Neyagawa, Osaka, 572-8572, Japan;(3) Department of Information Science, Hiroshima Prefectural University, Shobara, Hiroshima, 727-0023, Japan |
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| Abstract: | The effect of Pt addition to a V2O5/ZrO2 catalyst on the reduction of NO by C3H6 has been studied by FTIR spectroscopy as well as by analysis of the reaction products. Pt loading promoted the catalytic activity remarkably. FTIR spectra of NO adsorbed on the catalysts doped with Pt show the presence of two different types of Pt sites, Pt oxide and Pt cluster, on the surface. The amount of these sites depends on Pt contents and the catalyst state. Pt atoms highly disperse on the surface as Pt oxide at low Pt content, being aggregated into Pt metal clusters by increasing Pt amount or reducing the catalysts. The spectral behavior of V=O bands on the surface also supports the formation of Pt clusters. It is concluded that Pt promotes the NO–C3H6 reaction through a reduction–oxidation cycle between its oxide and cluster form. |
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| Keywords: | promoting effect Pt addition V2O5/ZrO2 catalysts NO reduction C3H6 Pt cluster FTIR |
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