【摘要】 在与进口催化剂完全相同的条件下评价了用化学还原法制备的Ru M B/ZrO2 (M =Zn ,Fe)催化剂的催化性能 .结果表明 ,Ru M B/ZrO2 的活性指数为 34 3 9,苯转化率为 40 %时环己烯选择性为 85 3%,均超过已工业化及文献报道的催化剂的最高水平 .活性组分Ru的晶粒度约为 5nm ,与进口催化剂接近 .确定了Ru M B/ZrO2 催化剂上苯选择加氢反应适宜的温度为 140℃左右 ,合适的氢压为 4～ 5MPa ,并从热力学和动力学的角度进行了分析 .预处理可使Ru M B/ZrO2 催化剂的活性降低 ,但使其选择性升高 ,并从反应机理的角度进行了讨论 .更多还原

【Abstract】 The selective hydrogenation of benzene to cyclohexene over a kind of Ru-M-B/ZrO 2 (M=Zn and Fe) catalyst prepared through chemical reduction method was investigated. The catalytic activity and selectivity of the catalyst were measured under the reaction conditions, showing that the activity index is 343.9 and the selectivity for cyclohexene is 85.3% at 40% benzene conversion. The activity and selectivity of the catalyst are higher than those of the industrialized catalyst and those of the same kind of catalysts reported in the literature. The crystallite size of the active component Ru in the catalyst is around 5 nm, closing to that of the imported catalyst. The effect of reaction conditions on selective hydrogenation of benzene was studied. The suitable temperature is around 140 ℃ and the optimum hydrogen pressure is 4～5 MPa for the reaction, the reason of which was discussed from the views of thermodynamics and kinetics combined with the experimental results. With pre-adsorption of hydrogen on the catalyst, the catalytic activity can be decreased moderately and the selectivity for cyclohexene can be improved, and these phenomena were discussed from the view of reaction mechanism.更多还原