摘要
用Ｍｇ￣（２＋）部分置换ＳｒＴｉＯ＿３中的Ｔｉ￣（４＋），由于Ｍｇ￣（２＋）与Ｔｉ￣（４＋）的电荷差异而在晶格中生成了氧缺陷，通过氧缺陷上吸附的活性氧物种，在低于６００℃温度范围内甲烷可以进行氧化偶联反应。由于吸附的活性氧物种随着反应的进行被消耗掉的同时，生成的水吸附在氧缺陷中抑制了气相氧的吸附。当提高反应压力时，氧缺陷中吸附的氧物种不断补充，使甲烷的氧化偶联反应可以进行。
It is found that Perovskite oxides, SrTiO_3 ,which are doped with MgO,con-taining oxygen defects can catalytically oxidize methane to C hydrocarbons at temperaturelower than 600℃under pressurized conditions. Active oxygen species for C_2 formation is as-sumed to be adsorbed oxygen on the defect.Whereas adsorbed water inhibits this reactionbecause of the suppression of oxygen adsorption.With increasing the gas pressure,the des-orption of adsorbed water can be promoted, which resuIts in the promotion of oxygen ad-sorption and thus in the promotion of oxidative coupling of methane.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1995年第2期174-179,共6页
Journal of Fuel Chemistry and Technology
关键词
甲烷
氧化
低温加压
钙钛矿
偶联反应
oxidative coupling of methane,low temperature under pressure, Perovskite type oxide
