采用沉淀法制备了氧化镧催化剂,并考察其催化低温甲烷氧化偶联反应的性能.催化剂性能测试结果表明,在723 K,CH4/O2摩尔比=3和GHSV=7 500 ml/(g.h)的条件下,甲烷的转化率和C2的选择性分别达26.6%和40.8%,比商品化氧化镧催化剂的启动温度低100 K.催化剂的表征结果表明,沉淀法制备的氧化镧催化剂与商品化的氧化镧催化剂都为六方晶相的氧化镧,但前者具有较大的比表面积,并且在598 K处出现一个明显的O2脱附峰. The lanthanum oxide catalyst was prepared by precipitation method and the catalytic performance of the catalyst for the oxidative coupling of methane under low temperature was investigated.The results of the catalyst performance test showed that at 723 K, CH4 / O2 molar ratio = 3 and GHSV = 7 500 ml / (gh) Under the conditions of methane conversion and C2 selectivity of 26.6% and 40.8%, respectively, than the commercial L-lanthanum catalyst activation temperature lower 100 K. Characterization of the catalyst results show that the precipitation of lanthanum oxide catalyst and the commercialization of Lanthanum oxide catalysts are hexagonal lanthanum oxide, but the former has a large specific surface area, and at 598 K at a significant O2 desorption peak.