以TiO2-SiO2为载体的磷化镍催化剂加氢脱氮反应 毕业论文.docx

摘要近年来,石油馏分脱氮的问题受到越来越多的重视。氮含量高会导致燃料质量下降,柴油十六烷值降低,喷气燃料烟点增高及污染严重等问题。本文采用改进的溶胶- 凝胶法制备了 TiO 2-SiO 2 复合载体,制备了不同 Ti/Si 配比的复合载体。考察了复合载体的制备条件对催化剂性能的影响。实验结果表明,复合载体的最优制备条件为:nTi/nSi 为1:2 ,Ni 2P负载量 25% 时,喹啉转化率为 98% 。在固定床反应器上,以最佳催化体系对模拟原料进行工艺条件的优化,采用程序升温法对其进行还原。考察催化剂不同反应温度、压力、进料体积空速、氢油比及原料中硫含量对催化剂加氢脱氮性能的影响。最佳工艺条件为:反应温度 360 ℃,压力 ,空速为 3h-1 ,氢油比 500/1 。关键词: 改进的溶胶-凝胶法;复合载体;深度加氢脱氮; 磷化钼 ABSTRACT Recently, nitrogen saturation in distillate fractions has receivedconsiderable attention. A high nitrogen content is associated with poorfuel quality, giving a low cetane number in diesel fuel and a high smokepoint in jet fuel, and other environmental problems. In this paper TiO2-SiO2 mixed oxides with different molar ratio of Ti、 Si have been prepared by improved solgel method. Influence of preparation condition ofthe molar ratio of Ti、 Sion catalytic performance were investigated. The result of experiment indicated that optimal conditions for supporter were: nTi/nSi =1:2, quinoline transformation rate of98 On the fixed-bed reactor, the technological conditions of model feedstock dydrotreating have been optimized, and catalysts were reduction by temperature -programmed method. The influence on the hydrodearomatics was investigated of reaction conditions at reaction temperature, hydrogen pressure, liquid hourly spacevelocity , V(H2)/Voil and S content. And the result also shows that optimum craftwork condition are: reaction temperature 360℃, reaction pressure MPa , and LHSV 500/1 . KEYWORDS : Improved sol-gelmethod;Noble metal catalyst ; Depth hydrodenitrogenation ; Molybdenum phosphides 目录 1前言................................................................................................................................. 1 柴油中的氮化物及加氢脱氮机理...................................................................... 2 柴油中的氮化物....................................................................................... 2 加氢脱氮( HDN )机理....................................................