The oxidative coupling of methane(OCM)isone of the most promising routes for the direct con-version of methane to ethylene[1].Ding et al[2]re-ported that a high surface concentration of alkaline earth metal cations fa...The oxidative coupling of methane(OCM)isone of the most promising routes for the direct con-version of methane to ethylene[1].Ding et al[2]re-ported that a high surface concentration of alkaline earth metal cations facilitated the formation of C_(2) hy-drocarbons during the OCM.Surface basicity is nec-essary for the OCM,and oxygen adsorbed on basic sites is also indispensable.The adsorbed electron defi-cient oxygen species on the catalyst surface plays a crucial role in methane conversion and the selectivity for Cz hydrocarbons.Our previous study[3]showed that increasing the Sr/Ti molar ratio in the per-ovskite-type SrTiO_(3) catalyst resulted in the surface enrichment of Sr,a larger amount of adsorbed oxygen species and higher selectivity for C_(2) hydrocarbons in the OCM.Recently,nanocatalysts have attracted much attention because of their remarkable catalytic performance[4.5].展开更多
基金Supported by the National Key Project for Basic Research of China(973 Project)(G1999022400).
文摘The oxidative coupling of methane(OCM)isone of the most promising routes for the direct con-version of methane to ethylene[1].Ding et al[2]re-ported that a high surface concentration of alkaline earth metal cations facilitated the formation of C_(2) hy-drocarbons during the OCM.Surface basicity is nec-essary for the OCM,and oxygen adsorbed on basic sites is also indispensable.The adsorbed electron defi-cient oxygen species on the catalyst surface plays a crucial role in methane conversion and the selectivity for Cz hydrocarbons.Our previous study[3]showed that increasing the Sr/Ti molar ratio in the per-ovskite-type SrTiO_(3) catalyst resulted in the surface enrichment of Sr,a larger amount of adsorbed oxygen species and higher selectivity for C_(2) hydrocarbons in the OCM.Recently,nanocatalysts have attracted much attention because of their remarkable catalytic performance[4.5].
