Oxidative coupling of methane on SrTiO3 perovskites partially substituted with transition ions

Perovskite oxide, SrTiO3 which was doped with Sm, La, Gd, Cr or Mo oxides oxidized methane to C2 coupled hydrocarbons. Activation of oxygen leads to total oxidation through electrophonic attack on the double bond of ethylene in Cr promoted SrTiO3. Selective oxidation is performed by cationic active centers in Lanthanide promoted SrTiO3, whereas oxygen is inserted by nucleophilic attack which may be considered as an acid base process. For promoted SrTiO3 catalysts with stable cation valance, p-type conductivity or electron donation ability of lattice oxygen is parallel to its ability of adsorbing and activating oxygen, and decreasing 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