Oxidative coupling of methane over BaCl 2-TiO 2-SnO 2 catalyst

Abstract

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 2H 4 yield over the catalyst is 20.1% with the CH 4 conversion of 43.8% and C2 selectivity of 53.3%.