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The Impact of Water on CO Oxidation with Au/TiO2 Catalysts: Poison or Promotor? A Study with an Au–TiO2/MCM-48 Model Catalyst

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Abstract

CO oxidation was studied with a model catalyst containing Au and TiO x nanoaggregates confined in a siliceous MCM-48 host. With this material, which has a particular small ratio between the TiO x and Au components, activities well comparable to those of unconfined Au/TiO2 catalysts were obtained in particular when a thermal activation in inert gas at temperatures between 523 and 673 K was applied. When the subsequent catalytic tests were performed in a feed containing ca. 20 ppm H2O, strong deactivation phenomena were observed which could be reverted by repeated thermal treatment and are most likely caused by carbonate deposition. This deactivation was strongly attenuated when the water content of the feed was decreased to ca. 6 ppm, which suggests that water plays an important role in the formation of the poisoning species. With unconfined Au/TiO2 catalysts, a promoting role of water on the formation of catalyst poison was observed as well, but to a much lower extent. The effect may therefore have escaped undetected so far as a contribution to the well-known catalyst deactivation by carbonate species.

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Acknowledgments

We gratefully acknowledge financial support by the German Science Foundation (DFG) in the frame of the Collaborative Research Center ‘‘Metal-support interactions in heterogeneous catalysis’’, SFB 558 (Projects B3 and A3).

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Author notes

  1. Andrea De Toni

    Present address: Sued-Chemie AG, Heufeld, Germany

Authors and Affiliations

  1. Laboratory of Industrial Chemistry, Ruhr University Bochum, P. O. Box 102148, 44780, Bochum, Germany

    Andrea De Toni & Wolfgang Grünert

  2. Laboratory of Crystallography, Ruhr University Bochum, P. O. Box 102148, 44780, Bochum, Germany

    Hermann Gies

Authors
  1. Andrea De Toni
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  2. Hermann Gies
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  3. Wolfgang Grünert
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Correspondence to Wolfgang Grünert.

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De Toni, A., Gies, H. & Grünert, W. The Impact of Water on CO Oxidation with Au/TiO2 Catalysts: Poison or Promotor? A Study with an Au–TiO2/MCM-48 Model Catalyst. Catal Lett 141, 1282–1287 (2011). https://doi.org/10.1007/s10562-011-0663-6

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  • DOI: https://doi.org/10.1007/s10562-011-0663-6

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