Effects of feed gas composition on oxidative coupling of methane over Na2WO4 -Mn/SiO2 catalyst

Effects of ethane, CO and CO2 contents in feed gas on activity of Na2WO4 - Mn/SiO2 catalyst in oxidative coupling of methane (OCM) were investigated. OCM was carried out in a two -stage fixed bed micro - reactor. Increase of ethane content in feed gas inhibits methane conversion and promotes formation of CO to a certain extent. Increase of CO content in feed gas leads to production of CO2, but inhibits production of CO. Change of CO2 content in feed gas has little effect on activity of catalyst. The two - stage reactor is an effective measure to increase yield of ethylene. Conversion of methane, selectivity to C2 components and yield of ethylene can reach 60. 5%, 62. 8% and 33. 1%, respectively.