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For adjusting the surface properties of the catalysts some metroxides as the promoter were added into Li-La/TiO_2 system and enhanced theactivity and ethylene selectivity for the oxidative coupling of methane.Theeffect of the reactant composition,the gas hourly space velocity(GHSV)andthe reaction temperature on the performance of the catalysts were investigat-ed.It was found that the methane conversion,C_2 selectivity and Cyieid wereaffected by the promoters.The SUC series exhibited high activity,selectivityand stability.Over catalyst SUC-3,methane conersion was up to 41.5%,C_2 selectivity,61.7% and C_2 yield,25.6% at 770℃ and GHSV=14400h~(-1).SUC-2 has continuously been operated at 850C and GHSV=3428h~(-1)for 500 hours,the methane conversion,C_2 selectivity and C_2 yieldkept at the level of about 30,60 and 18% respectively.
For adjusting the surface properties of the catalysts some metroxides as the promoter were added into Li-La / TiO 2 system and enhanced the activity and ethylene selectivity for the oxidative coupling of methane. The effect of the reactant composition, the gas hourly space velocity (GHSV) andthe reaction temperature on the performance of the catalysts were investigat- ed. It was found that the methane conversion, C 2 selectivity and Cyieid were affected by the promoters. SUC series exhibited high activity, selectivity and stability. Catalyst catalyst SUC-3, methane conersion was up to 41.5%, C 2 selectivity, 61.7% and C 2 yield, 25.6% at 770 ℃ and GHSV = 14400h -1 .SUC-2 has continuously been operated at 850C and GHSV = 3428h -1 for 500 hours, the methane conversion, C 2 selectivity and C 2 yieldkept at the level of about 30,60 and 18% respectively.