(144b) Oxidative Coupling of Methane on BaTiO3 Perovskites Partially Substituted with Germanium

The perovskite oxide BaTiO3, doped with Ge oxides oxidized methane to C2 coupled hydrocarbons.

The ultraviolet-visible spectra of pure barium titanate and Ge doped BaTi(1-x) GexO3 (x=0.05 ,0.1) were compared. The pure barium titanate exhibited an ultraviolet absorption effect. The addition of GeO2 resulted in an increase in absorption of wavelength. Therefore, small amount of Ge decreased band gap energy. Oxygen is inserted by nucleophilic attack which may be considered as an acid-base process. For promoted BaTiO3 catalysts with stable cation valance, electron donation ability of lattice oxygen is parallels to its ability of adsorb and active oxygen, and decrease the chance of deep oxidation of methyl radicals and C2 hydrocarbons and thus will result in an increase of C2 yield.

Keywords: methane, oxidative coupling, perovskite.