Ni/y--Al_2O_3催化剂上乙烯加氢反应的本征动力学

INTRINSIC KINETICS OF CATALYTIC HYDROGENATION OF ETHYLENE ON AN Ni/  Al 2O 3 CATALYST

常压下在２００～２８０℃温度范围内，应用内循环式无梯度反应器，实验测定了Ｎｉ／－Ａｌ２Ｏ３催化剂上乙烯加氢的本征反应速率．通过对不同反应模型推导出的动力学方程进行检验发现，假设催化剂表面上存在两类不同的活性中心，氢和乙烯分别吸附在彼此相邻但类型不同的活性中心上，氢和乙烯的吸附均呈分子状态，且表面反应为速率控制步骤时导出的本征速率方程，与实验数据非常符合，平均偏差为６．９％．通过分析还得到便于使用的简化速率方程，其平均偏差为７．０％

The intrinsic rates of ethylene hydrogenation reaction on an Ni/  Al 2O 3 catalyst have been measured at temperatures 200～280℃ and normal atmospheric pressure in an internal recycle gradientless reactor. After trying and selecting several rate equations procured from different reaction schemes, a rate equation deduced is in good agreement with experimental data with an average deviation of 6.9%, the reaction scheme of which is based upon the assumption that two different types of active sites, neighboring each other, are situated on the catalyst surface. A concise rate equation is finally formed through simplification, which fits in experimental results with an average deviation of 7.0%.