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Effects of Ru or Rh Addition on the Activity and Sulfur Tolerance of Pt/ZrO2 for the Oxidation of Methane at Low Temperatures

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Abstract

The effects of Ru or Rh addition on the catalytic oxidation of methane over Pt/ZrO2 were investigated at low temperatures under an oxidizing atmosphere. Adding Ru slightly improved the initial activity but significantly suppressed deactivation in the presence of SO2. Deactivation by SO2 was not observed using Ru–Pt/ZrO2 with Ru loadings of 2 wt% or higher. Adding Rh improved the initial activity significantly, but Rh–Pt/ZrO2 catalysts exhibited deactivation in the presence of SO2. Characterization of the catalysts revealed that the loaded Pt is maintained in a high oxidation state, similar to that of Pt4+, in Ru–Pt/ZrO2. These results suggest that the role of Ru is to maintain Pt in a high oxidation state in which Pt exhibits high activity for methane oxidation.

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Acknowledgments

The author is indebted to Mr. A. Hirayama for adsorption measurements and Mr. S. Kawabata for activity measurements. The XAFS measurements were carried out by the Measurement Service, which was operated by the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2011B2006, 2012A1780). The author is indebted to Drs. H. Ofuchi, S. Hirayama, M. Takagaki and T. Homma (JASRI) for obtaining the XAFS spectra.

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  1. Energy Technology Laboratories, Osaka Gas Co., Ltd., 6-19-9 Torishima, Konohana-ku, Osaka, 554-0051, Japan

    Hirofumi Ohtsuka

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  1. Hirofumi Ohtsuka
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Correspondence to Hirofumi Ohtsuka.

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Ohtsuka, H. Effects of Ru or Rh Addition on the Activity and Sulfur Tolerance of Pt/ZrO2 for the Oxidation of Methane at Low Temperatures. Catal Lett 143, 1043–1050 (2013). https://doi.org/10.1007/s10562-013-1056-9

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  • DOI: https://doi.org/10.1007/s10562-013-1056-9

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