负载镍层、析硅胶对模拟柴油吸附脱氮的研究

BASIC RESEARCH ON THE ADSORPTIVE DENITROGENATION OF MODEL DIESEL FUEL WITH MODIFIED SILICA GEL

以层析硅胶为载体,用等体积浸渍法制备金属镍负载量(w)分别为1.4%,2.6%,3.8%,5.0%,6.2%的脱氮吸附剂;在实验室间歇式吸附装置上,考察在氮化物质量分数为1 000gμ/g、吸附温度为120℃、油剂质量比60∶1的条件下,吸附剂的金属负载量对喹啉模拟柴油及吲哚模拟柴油的吸附脱氮效果,结果表明:当金属负载量(w)为5.0%时,吸附剂对喹啉的平衡吸附量最大,当金属负载量(w)为2.6%时,吸附剂对吲哚的平衡吸附量最大;喹啉和吲哚在吸附剂上的吸附明显具有多分子层吸附的基本特征。考察不同吸附温度下吸附剂对喹啉和吲哚的吸附效果,结果表明:吸附温度为100℃和120℃时,吸附剂对喹啉模拟柴油的吸附效果较好;140℃时,吸附剂对吲哚模拟柴油的吸附效果较好。

Five denitrogenation adsorbents loaded with 1.4%, 2.6%,3.8% , 5.0% and 6.2 % of nickel respectively were prepared by volumetric impregnation method using chromatographic silica gel as carrier. The adsorptive denitrogenation performances of the prepared adsorbents were investigated on a laboratory batch device under the conditions of an adsorption temperature of 120 ℃ and oil to adsorbent mass ratio of 60, using model diesel samples with initial nitrogen content of 1 000 gg/g containing indole or quinoline respectively. Test results show that the adsorption of quinoline and indole on the nickel containing adsorbent is characterized by multi-molecular layer adsorption significantly, and the best equilibrium adsorption capacity for quinoline and indole is obtained with adsorbent having Ni content of 5.0 and 2.6%,respectively. By studying the effect of adsorption temperature, it can be seen that for quinoline and indole,the optimum adsorption temperature is 100 ℃/120 ℃ and 140 ℃ ,respectively.