Abstract
The catalytic activity of 2wt% Ir/TiO2 in alcohol oxidation with molecular oxygen was enhanced by high-temperature reduction (673–873K) of the catalyst in a hydrogen stream. Wide variety of alcohols were converted efficiently into corresponding carbonyl compounds with 2wt% Ir/TiO2 reduced at 723K. Kinetic analysis revealed that the alcohol adsorption was enhanced by high-temperature reduction of catalysts. Formation of partially reduced titanium oxide by high-temperature hydrogen reduction of TiO2-supported metal catalysts is a widely known phenomenon as the SMSI effect. The formed TiO(2−δ) species containing coordinatively unsaturated titanium sites might contribute to the enhancement of catalysis as a coordination site of alcohols.
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