Abstract
Ti0.97Pt2+0.03O1.97 and Ti0.97Pt4+0.03O2 have been synthesized by a solution combustion method using alanine and glycine as the fuels, respectively. Both crystallize in anatase TiO2 structure with 15 nm average crystallite size. X-ray photoelectron spectroscopy (XPS) confirmed Pt ions are in the 2+ state in Ti0.97Pt0.03O1.97 (alanine) and 4+ state in Ti0.97Pt0.03O2 (glycine). The rate of CO oxidation occurring over Ti0.97Pt2+0.03O1.97 (0.76 μmol·g–1·s–1) is ∼10 times more than that over Ti0.97Pt4+0.03O2 at 60 °C (0.08 μmol·g–1·s–1). A large shift in 100% hydrocarbons conversion to lower temperature was observed for Pt2+ ion-substituted TiO2 relative to that for Pt4+ ion-substituted TiO2. After reoxidation of the reduced compound by H2 as well as CO, Pt ions are stabilized in mixed valences, 2+ and 4+ states. The role of oxide ion vacancy has been demonstrated by CO oxidation and H2 + O2 recombination reactions in the presence and absence of O2. We analyze the activated lattice oxygens upon substitution of...
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