Effect of the TiO<sub>2</sub> Reduction State on the Catalytic CO Oxidation on Deposited Size-Selected Pt Clusters Simon Bonanni Kamel Aït-Mansour Wolfgang Harbich Harald Brune 10.1021/ja2098854.s001 https://acs.figshare.com/articles/journal_contribution/Effect_of_the_TiO_sub_2_sub_Reduction_State_on_the_Catalytic_CO_Oxidation_on_Deposited_Size_Selected_Pt_Clusters/2547679 The catalytic activity of deposited Pt<sub>7</sub> clusters has been studied as a function of the reduction state of the TiO<sub>2</sub>(110)-(1 × 1) support for the CO oxidation reaction. While a slightly reduced support gives rise to a high catalytic activity of the adparticles, a strongly reduced one quenches the CO oxidation. This quenching is due to thermally activated diffusion of Ti<sup>3+</sup> interstitials from the bulk to the surface where they deplete the oxygen adsorbed onto the clusters by the formation of TiO<sub><i>x</i></sub> (<i>x</i> ≃ 2) structures. This reaction is more rapid than the CO oxidation. The present results are of general relevance to heterogeneous catalysis on TiO<sub>2</sub>-supported metal clusters and for reactions involving oxygen as intermediate. 2012-02-22 00:00:00 CO oxidation reaction Pt 7 clusters TiO 2 Reduction State Catalytic CO Oxidation CO oxidation