No abstract

A new dual catalyst bed system with Na 2 WO 4 /Mn/SiO 2 in the first layer and Co-La/SiO 2 in the second layer has been applied in the conversion of methane to ethylene and syngas simultaneously. The effects of flow velocity and the ratio of methane to oxygen on the catalytic performance were investigated. The results showed that, when F ) 150 mL/min, CH 4 /O 2 ) 2.5, the amount of Na 2 WO 4 /Mn/SiO 2 was 0.27 g in the first bed, and that of Co-La/SiO 2 was 0.1 g in the second bed, the expected mixture of C 2 H 4 /H 2 /CO ) 1/1/1 with a total yield of 20.6% for C 2 H 4 + CO was achieved, which could be directly used as a feedstock to produce propanal by hydroformylation of ethylene. The new process provides an efficient method for the utilization of CO 2 , H 2 O, and thermicity. The Co-La/SiO 2 catalyst on the second layer was found to possess a catalytic performance for both partial oxidation of methane and oxidative coupling of methane reactions.