最近一篇论文(Chemistry Letters,1990,1893)再次论述,一种氧化物催化剂可明显地提高甲烷氧化偶联反应的选择性。这种氧化物即一种高大孔形态的Bala_2O_4,可有效地把甲烷氧化偶联成乙烷和乙烯。当BaO/La_2O_3的分子比为1.0时,可获得最高的C_2收率。800℃下甲烷最高转化率为45%,C_2-产物收率为20%,选择性为44%。对比催化剂的制备条件,材料表面积相差很大,而对反应影响却很小。当催化剂堆密度较低时,对应的C_2产物收率较高。作者认为,在催化剂制备过程的热解中 A recent paper (Chemistry Letters, 1990, 1893) once again discusses that an oxide catalyst can significantly increase the selectivity of a methane oxidative coupling reaction. This oxide, a highly porous form of Bala 2 O 4, can be used to oxidatively couple methane to ethane and ethylene. When the molecular ratio of BaO / La 2 O 3 is 1.0, the highest yield of C 2 can be obtained. At 800 ℃, the maximum conversion of methane was 45%, the yield of C 2 -product was 20% and the selectivity was 44%. Comparing the preparation conditions of the catalyst, the surface area of ​​the materials varies a lot, but the influence on the reaction is very small. When the catalyst bulk density is lower, the yield of the corresponding C 2 product is higher. The authors believe that in the pyrolysis of the catalyst preparation process