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Interaction of CO with planar Au/TiO2 model catalysts at elevated pressures

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The interaction of CO with structurally well-defined, planar Au/TiO2 model catalysts at elevated pressures (up to 50 mbar) was studied in-situ by polarization-modulated infrared reflection absorption spectroscopy and ex-situ by X-ray photoelectron spectroscopy performed before and after CO exposure. The results indicate a CO-induced partial reduction of the oxide surface, which is evidenced by a low frequency C–O vibration at 2060 cm−1, combined with a spreading of the Au nanoparticles due to a modification of the Au-oxide interface energy. In a 2:1 CO:O2 atmosphere, TiO2 support reduction was not observed, and a pre-reduced surface was re-oxidized. The consequences of these results for the understanding of the CO oxidation mechanism on Au/TiO2 (model) catalysts are discussed.

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  1. Institute of Surface Chemistry and Catalysis, Ulm University, D-89069, Ulm, Germany

    Thomas Diemant, Zhong Zhao, Hubert Rauscher, Joachim Bansmann & R. Jürgen Behm

  2. Institute for Health and Consumer Protection, European Commission, Joint Research Centre, I-21020, Ispra, Italy

    Hubert Rauscher

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Diemant, T., Zhao, Z., Rauscher, H. et al. Interaction of CO with planar Au/TiO2 model catalysts at elevated pressures. Top Catal 44, 83–93 (2007). https://doi.org/10.1007/s11244-007-0281-0

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