Oxidative coupling of methane over BaCl2-TiO2-SnO2 catalyst

The performance of BaCl 2 -TiO 2 -SnO 2 composite catalysts in oxidative coupling of methane reaction has been investigated. A series of BaCl 2 -TiO 2 , BaCl 2 -SnO 2 , TiO 2 -SnO 2 , and BaCl 2 -TiO 2 -SnO 2 catalysts were prepared, and characterized by BET, XRD, XPS, CO 2 -TPD and H2-TPR, respectively. The synergistic effect among BaCl 2 , SnO 2 and TiO 2 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 (BaCl 2 : TiO 2 : SnO 2 molar ratio of 1:1:1). The optimal reaction conditions are as follows: 800°C, 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 C 2 H 4 yield over the catalyst is 20.1% with the CH 4 conversion of 43.8% and C2 selectivity of 53.3%.