关键词: oxidative coupling of methane , dual-bed reactor , monolithic catalysts , oxidative coupling of methane, dual-bed reactor, monolithic catalysts

Abstract: The particle/cordierite monolithic catalysts dual-bed reactor was constructed by 5%Na2WO4-2%Mn/SiO2 particle catalysts and 4%Ce-5%Na2WO4-2%Mn/SiO2/cordierite monolithic catalysts. The performance of the oxidative coupling of methane over the dual-bed reactor was evaluated. The effects of the bed height, feed gas operation model, reaction temperature, CH4/O2 ratio and feed gas velocity on the catalytic activities were investigated. The results indicated that the dual-bed catalysts reactor had exhibited a good performance for the oxidative coupling of methane when the feed gas passed firstly through the particle catalysts bed and then to the monolithic catalysts bed. The CH4 conversion of 37.3% and the C2H4 selectivity of 43.0% could be obtained with a particle catalyst bed height of 10 mm and a monolithic catalysts bed height of 50 mm in the dual-bed reactor. Compared with the 5%Na2WO4- 2%Mn/SiO2 particle catalysts in the single-bed reactor, the CH4 conversion and C2H4 selectivity can increase 3% and 11.9%, respectively. Compared with the 4%Ce-5%Na2WO4-2%Mn/SiO2/cordierite monolithic catalysts single-bed reactor, the CH4 conversion and C2H4 selectivity can increase 13.4% and 23.1%, respectively. The performance of the oxidative coupling of methane in the dual-bed reactor had remarkably been improved.