Oxidative coupling of methane over BaCl2-TiO2-SnO2 catalyst

The performance of BaCl2-TiO2-SnO2 composite catalysts in oxidative coupling of methane reaction has been investigated.A series of BaCl2-TiO2,BaCl2-SnO2,TiO2-SnO2,and BaCl2-TiO2-SnO2 catalysts were prepared,and characterized by BET,XRD,XPS,CO2-TPD and H2-TPR,respectively.The synergistic effect among BaCl2,SnO2 and TiO2 compositions enhances the catalytic performance.The best C2 selectivity and ethylene yield are obtained on the catalyst with the equal molar amount of the three compositions (BaCl2 ∶ TiO2 ∶ SnO2 molar ratio of 1 ∶ 1 ∶ 1).The optimal reaction conditions are as follows:800 ℃,44 mL·min-1 for methane,22 mL·min-1 for oxygen and a space velocity of 5000 mL·h- 1 ·g- 1,and the C2H4 yield over the catalyst is 20.1％ with the CH4 conversion of 43.8％ and C2 selectivity of 53.3％.