TiO2-SiO2二元复合载体的制备条件对加氢脱氮反应性能的影响

采用溶胶-凝胶法制备TiO2-SiO2复合载体，并进而制备出Ni2P/TiO2-SiO2 催化剂。在小型连续流动固定床反应器上以喹啉为模型化合物，考察复合载体的制备条件对催化剂加氢脱氮活性的影响。实验结果表明，复合载体的最佳制备条件为：n(Ti):n(Si)=1:2，n(CTAB):n(TBOT)=1:5，溶胶pH=3，载体焙烧终温550 ℃。采用最佳载体制备Ni2P/TiO2-SiO2 催化剂，在反应温度360 ℃ 、氢分压3 MPa、体积空速3 h-1、氢油体积比500的条件下，喹啉的加氢脱氮率可达到93.2%。

EFFECT OF THE PREPARATION CONDITIONS OF TiO2-SiO2 COMPLEX SUPPORT ON HYDRODENITROGENATION PERFORMANCE

TiO2-SiO2 complex support was prepared by sol-gel method and the effect of the preparation conditions on the hydrodenitrogenation(HDN)performance of Ni2P/TiO2-SiO2 catalyst was investigated.Test results showed that the optimum preparation conditions of TiO2-SiO2 complex support were obtained as follows:n(Ti)∶n(Si)=1∶2,n(CTAB)∶n(TBOT)=1∶5,a sol pH of 3.0 and a final calcination temperature of 550 ℃.The HDN performance of the prepared Ni2P/TiO2-SiO2 catalyst was evaluated on a small continuous fixed-bed reactor using quinoline as model compound under the conditions of a reaction temperature of 360 ℃,hydrogen partial pressure of 3 MPa,hydrogen/oil volume ratio of 500 and a LHSV of 3.0 h-1,the HDN rate of quinoline reached 93.2%.