OXIDATIVE COUPLING OF METHANE OVER BAF2-TIO2 CATALYSTS

The addition of F- to Ba-Ti mixed oxide catalysts significantly improv es the catalytic performances for the oxidative coupling of methane (M OC), which can achieve high C2 yields at wide feed composition range a nd high GHSV. The effect is particularly marked for the BaF2-TiO2 cata lysts containing more than 50 mol% BaF2. The C2 yield of 17% and the C 2 selectivity of > 60% were achieved over these catalysts at 700-degre es-C. After being on stream for 31 h, the greater-than-or-equal-to 50 mol% BaF2-TiO2 catalysts showed only a 1-1.5% decrease in the C2 yield s. Results obtained by XRD show that various Ba-Ti oxyfluoride phases were formed due to the substitution of F- to O2-.