Oxygen adsorption on Pt/TiO2 catalysts

摘要: Abstract Oxygen adsorption over Pt/TiO 2 surfaces were investigated as a function of metal loading. pure TiO was molecular at all pressure ranges investigated. On the other hand, differential heats measured by calorimetry indicated that oxygen dissociative until Pt surface saturated with oxygen. The saturation coverage atomic on determined approximately one from calorimetry. initial heat ∼375 kJ/mol 0.5 wt.% . coverages less than monolayer ∼200 kJ/mol consistent single crystals reported in literature. As increased after surface, continued manner similar to Isosteric and samples >5 μmol/g catalyst be around 10 kJ/mol. amounts depended strongly pretreatment conditions. Most favorable observed calcined/reduced samples.