CO Spillover and Oxidation on Pt/TiO2 |
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| Authors: | Robert Green Peter Morrall Michael Bowker |
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| Affiliation: | (1) School of Chemistry, Cardiff University, Cardiff, UK. School of Chemistry, University of Reading, Reading, UK;(2) School of Chemistry, Cardiff University, Cardiff, UK. School of Chemistry, University of Reading, AWE Aldermaston, Aldermaston, UK |
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| Abstract: | The adsorption of CO has been measured on a 2.5 wt% Pt/TiO2 catalyst using TPD. A somewhat surprising observation is that (i) CO2 is produced, even though oxygen is not dosed into the system, (ii) repeated experiments result in the same amount of CO2 desorption. The results appear to be due to a combination of factors–(i) is due to spillover of CO from the Pt to the TiO2 support, while (ii) is due to the diffusion of Ti3+ into the bulk of the TiO2 crystallite, which effectively removes the surface non-stoichiometry which might otherwise be expected. |
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| Keywords: | carbon monoxide CO adsorption CO oxidation metal-support interactions Pt-TiO2 spillover TPD |
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