Manganese catalysts for the oxidative condensation of methane with alkali and alkaline-earth metal salt additives

Abstract

1. The addition of acetates of alkali (Li, Na, K, and Cs) and alkaline-earth (Mg and Ca) metals affects the catalytic properties of Mn/SiO2 catalysts in the oxidation condensation of methane to give C2-hydrocarbons. 2. The promotion effect of sodium salts depends on the nature of the salt anion. Greatest efficiency is found for the (Mn + NaCl)/SiO2 catalyst. At 800°C and methane/air mole ratio equal to 0.55, C2-hydrocarbons are formed on this catalyst with 25.8% yield and 77.5% selectivity; the ethylene content in the methane condensation products is 95%.