Hydrodesulfurization (HDS) reaction of dibenzothiophene (DBT) and 4, 6-dimethyldibenzo-thiophene (4, 6-DMDBT) was studied over Ni-Mo/TiO2 catalyst in a high-pressure trickle-bed reactor. The HDS activity of Ni-Mo/Ti02 catalyst was examined using the model solution of DBT, 4, 6-DMDBT and n-octane as raw materials at various reaction temperatures, hydrogen pressures, hydrogen/oil volume ratios, liquid hourly space velocities, and initial concentrations of model compounds. The results showed that the conversion of DBT and 4, 6-DMDBT increased with the increase of reaction temperature and volume ratios of hydrogen/oil. It was found that hydrogen pressure had great influence on the conversion of DBT and 4, 6-DMDBT, especially for 4, 6-DMDBT. However, when the hydrogen pressure was high e-nough, it exerted little influence on both. The conversion of DBT and 4, 6-DMDBT could reach 98. 80% and 98. 12% , under conditions of the reaction temperature of 350 ℃ , hydrogen pressure of 7 Mpa, hydrogen/Oil volume ratio of 450, liquid hourly space velocity of 6 h-1, initial DBT mass fraction of 2.0% , and initial 4, 6-DMDBT mass fraction of 0. 2%.%采用高压滴流床反应器,以二苯并噻吩(DBT)与4,6-二甲基二苯并噻吩(4,6- DMDBT)的正辛烷溶液作为模型溶液,在不同的反应温度、氢压、氢油体积比、液时空速(LHSV)、模型化合物初始质量分数的条件下,考察了DBT和4,6-DMDBT在Ni - Mo/TiO2催化剂上的加氢脱硫反应(HDS)规律.结果表明:提高反应温度以及增大氢油体积比均有利于DBT和4,6-DMDBT加氢脱硫反应的进行；氢分压对DBT和4,6-DMDBT转化率的提升也有很大影响,对4,6-DMDBT转化率的提升效果较大,但当氢分压较大时,增大氢分压对两者转化率的影响均较小.在反应温度350℃、氢压7 MPa、液时空速6h-1、氢油体积比450、DBT和4,6-DMDBT初始质量分数分别为2.0％和0.2％的条件下,DBT的转化率可达98.80％,4,6-DMDBT的转化率可达98.12％.
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