钙钛矿型复合氧化物Sr_xTiO_(3-δ)表征及甲烷氧化偶联反应催化性能

Characterization and Catalytic Properties of Perovskite-type Sr_xTiO_(3-δ) Catalysts for Methane Oxidative Coupling

用x-射线粉末衍射 (XRD)、x-光电子能谱 (XPS)、氧吸附—程序升温脱附 (O -TPD)研究了柠檬酸热分解法制备的钙钛矿型SrxTiO3 -δ(x=0 .9,1.0 ,1.1)催化剂组成、结构与甲烷氧化偶联反应 (OCM)催化性能 ,结果表明钙钛矿型SrxTIO3 -δ催化剂随着Sr/Ti比的增加 ,催化剂的氧空位增多 ,催化剂表面吸附氧含量增大 ,吸附氧脱附温度升高 ,与其C2 选择性相关联。

The structure and catalytic properties of Sr xTiO 3-δ (x=0.9,1.0,1.1) perovskite-type catalysts for oxidative couping of methane (OCM) have been studied by using X-ray diffraction (XRD)、X-ray photoelectron spectroscopy (XPS) and O 2-tempreture program promation (O 2-TPD). It has been shown that increasing the amount of Sr/Ti ratio in Sr xTiO 3-δ perovskite-type catalysts results in the higher content of adsorbed oxygen species on the surface of catalysts and thus higher C 2-selectivity for OCM reaction. It is suggested that adsorbed oxygen species on the surface of Sr xTiO 3-δ catalysts are the main active species for OCM reaction.