Pt/MOR催化异丙苯临氢脱烷基的失活动力学研究

DEACTIVATION KINETICS OF CUMIN HYDRODEA LKYLATION OVER Pt/MOR CATALYST

在固定床积分反应器中实验研究了Pt/MOR催化剂催化重芳烃临氢脱烷基的失活动力学。实验以异丙苯为反应原料,在反应压力0.8 MPa、温度范围673.15～733.15K、体积空速1～2h^-1的条件下,得到了失活动力学数据。基于实验现象建立了Pt/MOR催化剂幂函数表观失活动力学模型,即由反应产物引起的连串失活。通过拟合实验数据估计了失活动力学模型的参数。结果表明：外扩散对脱烷基反应的影响可以忽略不计,内扩散对脱烷基反应的影响较小;异丙苯临氢脱烷基的反应活化能和催化剂失活的活化能分别为44.15kJ/mol和79.00kJ/mol。Pt/MOR催化剂失活动力学模型的秩和与残差分布检验结果表明,该失活动力学模型在显著性水平α=0.05下是显著的,即所得失活动力学模型有较高的拟合精确度和可信度。

Deactivation kinetics of heavy aromatics hydrodealkylation over the Pt/MOR catalyst was investigated by using an integral fixed bed reactor.The deactivation kinetics data were obtained under the conditions of reaction pressure 0.8 MPa,reaction temperature 673.15-733.15 K,liquid hourly space velocity 1-2h^-1,using cumin as feed.According to the experimental results,apower-law apparent deactivation kinetics which was caused by reaction products of a series deactivation was established,and the parameters of deactivation kinetics model were estimated by fitting the experimental data.The results show that the effects of external diffusion on dealkylation reaction could be negligible and the internal diffusion had less impact on it,the reaction activation energy and the deactivation activation energy were 44.15kJ/mol and 79.00kJ/mol,respectively.Rank and residual distribution test indicate that the deactivation kinetics model is significant under the conditions of the significance levelα=0.05,and the deactivation kinetics model has a high fitting accuracy and credibility.