Abstract: The kinetics of vapor phase benzene hydrogenation reaction on a commercial nickel catalyst was studied in an internal recycle gradientless reactor under atmospheric pressure. The molar ratio of hydrogen to benzene was varied between 6.0 and 18. The temperature range investigated was 90℃-180℃. The catalyst loading of liquid benzene was 1-46 ml/h·g-cat. Assume that there are two kinds of sites on the catalyst surface, benzene vapor adsorbs on one type of site X and hydrogen dissociate upon adsorption on another, say S. Reaction scheme consists of the following steps: Assume that the third step is the rate determining step, and hydrogen are weakly adsorbed on the surface, the intrinsic kinetic equation of cyclohexane formation is derived as follow: where pB and pH are the partial pressures of benzene and hydrogen respectively, k is rate constant and bB, the adsorption equilibrium constant of benzene. The experimental results fitted in this equation with an average absolute deviation of 6.1% The activation energy of reaction was found to be equal to 1.31×104 cal/ mol, and the heat of adsorption of benzene 9840 cal/mol, which are close to the values from literature.

摘要： 在常压下,应用内循环式无梯度反应器,研究了在国产工业镍催化剂上苯气相加氢的本征动力学.假设催化剂表面上存在两类不同的活性中心,氢及苯各自吸附在相邻的不同类型的活性中心上,设第一个氢原子加入苯环的步骤为反应速率控制步骤,据此以导出反应的动力学方程,与实验数据颇相符合,平均偏差6.1%.测得的本征反应活化能为13.1kcal/mol.苯的吸附热为9.84kcal/mol,与不存在化学反应时的测定结果相接近.