正己烷在Pt/HBeta催化剂上的异构化反应动力学模型

采用等体积浸渍法制备了Pt/HBeta催化剂,并在10 mL固定床反应装置上评价了反应温度和质量空速对Pt/HBeta催化正己烷临氢异构化反应的影响，在此基础上建立正己烷异构化反应动力学模型。结果表明：在 240~260  ℃内正己烷临氢异构化反应可以用拟一级动力学模型来描述，反应的活化能Ea=139.06 kJ/mol，指前因子A=7.3814×1013 h-1；建立了连串反应动力学模型，第一步反应活化能Ea=167.80 KJ·mol-1，A=7.2130×1016 h-1，第二步反应活化能Ea=118.34 KJ·mol-1，A=1.3053×1011 h-1；当反应温度大于260 ℃，拟一级动力学模型不再适合，修正后270 ℃时的反应级数为1.3，280  ℃时的反应级数为1.7。

Kinetics Model of the Hexane Isomerization on a Pt/HBeta Catalyst

The Pt/HBeta catalyst was prepared by the equivalent volume impregnation method and the hydroisomerization reaction of n-hexane was carried out in a 10 mL fixed-bed reactor. The effects of MHSV on the isomerization of n-hexane were investigated at different reaction temperatures. Based on these results, the kinetic model of the isomerization reaction was established. The results show that the hydroisomerization reaction of n-hexane  at 240-260 ℃ can be described by a pseudo first-order kinetic model, in which the activation energy is E_a=139.06 kJ/mol , and the pre-factor is A=7.3814×10¹³ h^-1. A=7.3814×10¹³ h^-1.  Further, we proposed a kinetic model for the sequential reaction, where at the first step, E_a1=118.34 kJ/mol, A₁=7.2130×10¹⁶ h^-1, and at the second step, E_a2=118.34 kJ/mol, A₂=1.3053×10¹¹ h^-1. We found that pseudo first order kinetic model is not applicable when temperature is higher than 260  ℃. After corrections, the reaction order at 270  ℃ is 1.3 and the reaction order at 280  ℃ is 1.7.