在Pd/γ-Al_2O_3催化剂上气相苯加氢反应动力学研究  

Kinetics of Vapor-Phase Benzene Hydrogenation on Pd/γ-Al_2O_3

作　　者：周志明[1] 李卓[1] 程振民[1] 袁渭康[1] 

机构地区：[1]华东理工大学联合化学反应工程研究所,上海200237

出　　处：《石油化工》2003年第5期392-397,共6页Petrochemical Technology

基　　金：国家自然科学基金资助项目(20106005);中国石油化工集团公司资助项目。

摘　　要：采用微反装置研究了在加压条件下气相苯在Pd/γ-Al2O3催化剂上加氢反应的本征动力学。根据催化剂颗粒的孔径分布,通过理论计算得到了催化剂不发生内部部分润湿的实验操作条件。在此基础上,通过实验测得了不同反应条件下的组分分压和反应速率。假设在催化剂表面上存在两类不同的活性中心,一类吸附氢,另一类吸附苯及反应中间物,氢与苯之间为非竞争吸附;并假定向苯环上加入第一个氢原子的表面反应为速率控制步骤,进而导出动力学方程。实验数据验证了该动力学模型的合理性。The kinetics of vapor-phase benzene hydrogenation to cyclohexane on Pd/γ-Al2O3 catalysts was studied between 373 K and 433 K and under 1.0 MP a pres s ure in a differential reactor. Experimental conditions, under which no capillar y condensation took place within catalyst particles, were theoretically determine d according to the pore size distribution of the catalyst used. The reaction ra t es and partial pressures of the components under different reaction conditions w ere measured by experiments. Two different types of active sites on the surface of the catalyst were assumed, one with adsorbed hydrogen and the other adsorbed benzene and intermediates. In addition, the surface reaction between the first adsorbed H-atom and adsorbed benzene was assumed as the rate-determining ste p(RDS). Experimental data verified the rationality of the kinetic model.

关 键 词：Pd/γ—A1203催化剂 气相 苯加氢 反应动力学 环已烷 部分润湿 钯催化剂 

分 类 号：TQ241.11[化学工程—有机化工] TQ426.94