Tin-Containing Catalysts,Modified with Alkaline Earth Metals in the Oxidative Dimerization of Methane

The effect of addition alkaline earth metals on the physico-chemical properties of M-Sn-O/-Al₂O₃ and M-Pb-Sn-O/-Al₂O₃ catalysts is studied. The formation of metal metastannates in the M-Sn-O/-Al₂O₃ system facilitated the growth of selectivity of the catalysts. Addition of alkaline earth metals into the Pb-Sn-O/-Al₂O₃ composition resulted in stabilization of lead in the 4-valent state with formation of metal ortho-plumbates and a decrease in the selectivity for C₂ hydrocarbons. The linkage between the basicity of the surface and the catalytic properties of the samples was established.