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研究了甲烷在La_2O_3/MgO催化剂上的氧化偶联。发现制备过等对催化剂的行为有显著影响。比较了催化剂的反应性能和体相结构,表明在MgO上存在着三种La_2O_3的状态:高分散La_2O_3是最活泼的;La(OH)_3不太活泼;而呈六方晶相的La_2O_3晶粒活性最低。在催化剂中加入Na_2CO_3和K_2CO_3可以改进催化剂的活性和选择性。还考察了反应条件如温度和空速的影响。
The oxidative coupling of methane over La 2 O 3 / MgO catalyst was studied. It was found that preparation and the like have a significant effect on the behavior of the catalyst. The results show that there are three states of La_2O_3 on MgO: highly dispersed La_2O_3 is the most active species; La (OH) _3 is not active; and the activity of La_2O_3 in hexagonal phase lowest. Addition of Na_2CO_3 and K_2CO_3 to the catalyst can improve the activity and selectivity of the catalyst. The effects of reaction conditions such as temperature and space velocity were also examined.