Oxidative coupling of methane over Na-W-Mn-Zr-S-P/SiO₂ catalyst: Effect of S, P addition on the catalytic performance

The multi-component catalysts we prepared exhibited high performance for the oxidative coupling of methane. The highest activity of catalysts was obtained over the Na-W-Mn-Zr-S-P/SiO₂ at the temperature of 1,023 K, on which the C₂ yield was 23.5% at the methane conversion of 43.8%. XRD and XPS results showed the S, P addition could lead to the increase of lattice oxygen concentration and the formation of phase such as Na ₂SO₄, Na₂Zr(PO₄)₂ on the catalysts. These phases play great roles in activity of the catalysts system.