Catalytic Partial Oxidation And Steam Reforming Of Methane On La 2o 3-al 2o 3 Supported Pt Catalysts As Observed By X-ray Absorption Spectroscopy

Structural transformations of Pt supported on Al 2O 3 or La 2O 3-Al 2O 3 were studied by X-ray absorption near edge structure (XANES) at the Pt L 3 edge during heating and cooling under partial oxidation of methane (POM) conditions, and by extended X-ray absorption fine structure (EXAFS) under steam reforming of methane (SRM) conditions. Ignition of the POM reaction occurred simultaneously with the reduction of PtO 2 to metallic Pt, indicating that the ignition occurs on metallic Pt. When the temperature of the POM reaction was decreased, carbon accumulated on the metallic Pt surface, and the activation of CH 4 was suppressed at about 370 °C. Nevertheless, the oxidation of carbon remaining on the metallic Pt surface continued until a temperature of around 270 °C was reached, when oxidation of Pt occurred and the oxidation reactions were extinguished. 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