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报导了表面相Li在甲烷氧化偶联反应中的作用。应用XRD,SEM,ESR及IR-PAS等技术对Li-Mn-Mg-O催化剂体系表面相的组成、结构及活性进行了测试,发现C_2产物的生成量同表面相Li的含量有较好的对应关系。同时发现含Li催化剂的失活同表面相Li的流失有密切的关系。表面Li的流失可借助体相Li在适当温度下扩散得到补充,但这种补充也是很有限的。
Reported the role of surface phase Li in methane oxidative coupling reaction. The composition, structure and activity of the surface phase of Li-Mn-Mg-O catalyst system were tested by XRD, SEM, ESR and IR-PAS techniques. It was found that the formation of C 2 product was better than that of Li Corresponding relationship. It is also found that the deactivation of the Li-containing catalyst is closely related to the loss of Li in the surface phase. The loss of surface Li can be supplemented by diffusion of the bulk Li at an appropriate temperature, but this supplement is also limited.