论文部分内容阅读
The study of scale up for the oxidative coupling of methane(OCM)has been carried out in a 200 ml stainless steel fixed-bed reactor over a 5wt% Na_2WO_4-1.9wt% Mn/SiO_2(W-Mn/SiO_2)catalyst.The effects of reaction conditions were investigated in detail.The results showed that,with increasing reaction temperature,the gas-phase reaction was enhanced and a significant amount of methane was converted into CO_x;with the CH_4/O_2 molar ratio of 5,the highest C_2(ethylene and ethane) yield of 25% was achieved;the presence of steam(as diluent)had a positive effect on the C_2 selectivity and yield.Under lower methane gaseous hourly space velocity(GHSV),higher selectivity and yield of C_2 were obtained as the result of the decrease of released heat energy.In 100 h reaction time,the C_2 selectivity of 66%-61% and C_2 yield of 24.2%-25.4% were achieved by a single pass without any significant loss in catalytic performance.
The study of scale up for the oxidative coupling of methane (OCM) has been carried out in a 200 ml stainless steel fixed-bed reactor over a 5 wt% Na_2WO_4-1.9 wt% Mn / SiO_2 (W-Mn / SiO_2) catalyst. effects of reaction conditions were investigated in detail. The results showed that, with increasing reaction temperature, the gas-phase reaction was enhanced and a significant amount of methane was converted into CO_x; with the CH_4 / O_2 molar ratio of 5, the highest C_2 (ethylene and ethane) yield of 25% was achieved; the presence of steam (as diluent) had a positive effect on the C_2 selectivity and yield. Lower methane gaseous hourly space velocity (GHSV), higher selectivity and yield of C_2 were obtained as the result of the decrease of released heat energy. 100 h reaction time, the C 2 selectivity of 66% -61% and C 2 yield of 24.2% -25.4% were achieved by a single pass without any significant loss in catalytic performance.