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Pd nanoparticle enhanced re-oxidation of non-stoichiometric TiO2: STM imaging of spillover and a new form of SMSI

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Abstract

We have used STM imaging in situ to demonstrate two fundamental steps in catalytic processes on model catalysts at elevated temperature. We show that Pd nanoparticles on sub-stoichiometric TiO2(110) dissociatively adsorb O2 at 673 K which “spills over” onto the support where further reaction takes place. The spillover oxygen re-oxidises the surface by removing Tin+ interstitial ions trapped in the crystal lattice, preferentially re-growing TiO2 around and over the particles. The identification of the metal enhanced re-oxidation mechanism may have important and general consequences for the understanding of catalysis and gas sensing.

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Authors and Affiliations

  1. Catalysis Research Centre, Department of Chemistry, University of Reading, Reading, RG6 6AD, UK

    R.A. Bennett, P. Stone & M. Bowker

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  1. R.A. Bennett
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  2. P. Stone
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  3. M. Bowker
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Bennett, R., Stone, P. & Bowker, M. Pd nanoparticle enhanced re-oxidation of non-stoichiometric TiO2: STM imaging of spillover and a new form of SMSI. Catalysis Letters 59, 99–105 (1999). https://doi.org/10.1023/A:1019053512230

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