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在流动循环装置中常压下进行了环已烷在铂重整催化剂上的脱氢反应动力学研究.在300℃以下的动力学方程式为v=(kp1)/1+a2p2,其中k及a2为常数,p1,p2分别为环己烷及苯的分压.反应的限制步骤是环己烷的化学吸附速度.反应的视活化能E=22.4千卡/克分子,真实活化能E′=16.5千卡/克分子. 研究了在不同的铂重整催化剂上的脱氢反应,其视活化能的差别在实验误差范围内,因而可假设活性的差别主要由于铂的表面分散度或活性中心浓度不同所引起.
The kinetics of the dehydrogenation of cyclohexane on Pt reforming catalyst was studied under normal pressure in a flow-circulating device. The kinetic equation at 300 ℃ was v = (kp1) / 1 + a2p2, where k and a2 Is a constant, p1 and p2 are the partial pressures of cyclohexane and benzene, respectively, and the limiting step of the reaction is the chemisorption rate of cyclohexane.The apparent activation energy E = 22.4 kcal / mol and the real activation energy E ’= 16.5 kcal / mol. The dehydrogenation reaction on different platinum reforming catalysts was investigated and the apparent activation energy difference was within the experimental error range. Therefore, it can be assumed that the difference in activity is mainly due to the surface dispersion or active center of platinum Concentration caused by different.