Ni-Mo/TiO_2-Al_2O_3催化剂上柴油加氢脱硫反应动力学

Kinetics of Hydrodesulfurization of Diesel over Ni-Mo/TiO_2-Al_2O_3 Catalyst

采用高压滴流床反应器,在反应温度280～360℃、H2分压5～7 MPa、氢与油体积比300～900、液态空速1～6 h-1的条件下,考察了柴油在Ni-Mo/TiO2-Al2O3催化剂上的加氢脱硫反应规律,并建立了柴油加氢脱硫反应动力学模型。采用Levenberg-Marquard优化方法对实验数据进行回归,确定了反应动力学模型中的有关参数。实验结果表明,Ni-Mo/TiO2-Al2O3催化剂上柴油加氢脱硫反应为1.5级,表观活化能为78 002 J/mol。模型计算结果与实验数据吻合良好,平均相对偏差仅为2.7%。

The hydrodesulfurization（HDS） of diesel over Ni-Mo/TiO2-Al2O3 catalyst in a high pressure trickle-bed reactor was studied. The kinetics experiments for the HDS were carried out under the conditions of reaction temperature of 280-360℃, hydrogen pressure of 5-7 MPa, hydrogen/oil volume ratio of 300-900 and LHSV of 1-6 h-1. The kinetics model for the HDS was established. The experimental data were fitted by Levenberg-Marquard method. The result indicates that the HDS over the Ni-Mo/TiO2-Al2O3 catalyst is a 1.5 order reaction and its apparent activation energy is 78 002 J/ tool. The calculated values are in good agreement with the experimental results and the average relative deviation is 2.7%.