摘要
采用溶胶 凝胶方法制备了 TiO2 SiO2 复合氧化物, 分析表征了其酸性, 以复合氧化物为载体制备了重油催化裂化(RFCC)柴油加氢精制催化剂。结果表明, TiO2 SiO2 复合氧化物的酸性与 Ti/Si摩尔比有关。酸的类型对催化剂的脱硫性能有显著的影响, 以 TiO2 SiO2 复合氧化物载体制得的 Br sted酸(B酸)较高的催化剂, 对分子结构相对简单的苯并噻吩类硫化物有较好的脱除性能; Lewis 酸(L 酸)较高的催化剂则有利于芳烃的加氢饱和与取代二苯并噻吩的脱除。采用F改性的方法可以提高载体的强 L酸量和催化剂初始阶段的加氢脱硫性能及对二苯并噻吩的脱除性能, 但 RFCC 柴油中存在的烯烃及碱性氮化物易使催化剂的活性下降。
The TiO2-SiO2 composite oxides prepared by sol-gel method were used as supports for preparing catalysts for RFCC diesel hydrofining. The examination results showed that the acidity of the TiO2-SiO2 composite oxides varied with different Ti/Si (mol) ratios, and the acidity of these oxides affected remarkably on their hydrodesulfurization (HDS) performances in terms of the types of acidity. A higher amount of Brosted acid sites in the catalysts resulted in better HDS activity, especially for those sulfur compounds with relatively simple molecular structures. Catalysts with higher amount of Lewis acid sites showed better HDS and hydrodearomatizaton (HDA) activities for substituted DBTs. The fluorine-modified TiO2-SiO2 supports promoted the initial HDS and HDA activities of catalysts by producing some stronger Lewis acid centers. The existence of olefin and the basic nitrogen compounds in the RFCC diesel oil deteriorated the stability of the catalyst.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2005年第1期12-17,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然基金(20276040)
中国石油化工科技研究开发项目(X503031)
中国石油创新基金(03E7015)项目资助
关键词
TiO2-SiO2复合氧化物
酸性
柴油
加氢精制
Acidity
Catalysts
Desulfurization
Hydrogenation
Molecular structure
Oxides
Silica
Sol
gels
Titanium dioxide
