【摘要】 主要讨论了氢对甲醇气相羰基化催化体系的影响 .采用多孔碳化聚偏二氯乙烯小球负载金属镍催化体系 ,在不同进气条件下进行甲醇羰基化反应 ,得到不同氢含量时催化剂的活性和稳定性数据 ,以及氢对催化体系的微扰数据 ,并对催化剂的表面形态用SEM进行了表征 ,以评价氢的影响 .从三个方面分析了氢对气相甲醇羰基化催化体系的影响 ,认为适量存在的氢对长时间保持催化剂活性是有利的 .更多还原

【Abstract】 In recent years, many efforts have been offered to develop novel catalysts for vapor-phase methanol carbonyaltion. As reported, porous carbon materials are relatively the most suitable supports, but the noticeable problem is the poor stability of the catalysts. In this work, the experiments were designed to explore the affecting parameter, hydrogen content, on the catalyst stability. Nickel supported on carbonized poly(vinylidene chloride) beads, which are a kind of novel and excellent porous carbon, was used as a catalyst for vapor-phase methanol carbonylation under different feed gas conditions, such as CO, 5CO-1H 2 and 1.5CO-1H 2. The results of catalytic carbonylation indicated that the activity and stability of the catalyst have dependence on the hydrogen concentration in feed gas, further, the perturbation of hydrogen to the catalyst system was detected. The effects of hydrogen were discussed from three aspects: (1) effect of hydrogen on mass transport over nickel surface; (2) effect of hydrogen on the catalyst stability; (3) adjunctive reactions aroused by hydrogen. It was concluded that the proper content of hydrogen could promote the activity and stability of the catalyst.更多还原