Study of oxidative coupling of methane over Sr 2-x La x TiO 4 materials

Abstract

Strontium titanate Sr 2 TiO 4 was synthesized by various methods (coprecipitation, precipitation on titania, and citrate method). The samples were characterized using X-ray diffractometry, mercury porosimetry, and BET techniques. Obtained materials had a perovskite-like structures, good crystallinity and specific surface areas of 0.6 to 3 m 2 /g. The catalytic activity to oxidative coupling of methane was determined at the temperature range of 700-900°C. The highest yield of C 2 hydrocarbons was observed with the samples prepared by co-precipitation with K 2 CO 3 . Samples of Sr 2-x La x TiO 4 catalyst synthesized by co-precipitation were examined. The highest the activity was established for Sr 2-x La x TiO 4 at the stoichiometric range of lanthanum content x (La) = 0.8-1.8.