MoO3/TiO2催化剂的二苯并噻吩加氢脱硫性能

以介孔氧化钛晶须成型材料为载体，通过浸渍法制备不同MoO3负载量的MoO3/TiO2加氢脱硫催化剂. XRD分析表明，介孔氧化钛晶须成型载体为纯锐钛矿相，MoO3负载量为7.2%(w)的催化剂未出现MoO3的衍射峰；BET分析显示，负载7.2%(w) MoO3后，氧化钛晶须成型载体的比表面积和孔容能保持原来的80%以上. 活性评价结果表明，未经预硫化的MoO3/TiO2催化剂直接应用于二苯并噻吩(DBT)加氢脱硫反应时，在温度280~300℃、氢分压2.0 MPa、体积空速4 h-1、H2/油体积比600的条件下，DBT转化率达100%. 将模型溶液中硫含量由400′10-6 g/g降至10′10-6 g/g以下，催化剂表现出较高的活性，且在一定条件下运行1000 h未出现失活迹象.

Hydrodesulfurization of Dibenzothiophen with MoO3/TiO2 Catalyst

Mesoporous titania whiskers were used as MoO3 hydrodesulfurization catalyst support. The novel support was impregnated with ammonium heptamolybdate (NH4)6Mo7O24×4H2O] solution at different concentrations, and MoO3/TiO2 catalyst with different MoO3 loadings was obtained. The catalyst was characterized by XRD, N2 adsorption-desorption and SEM, the one with higher dispersion of MoO3 was chosen for dibenzothiophene hydrodesulfurization. And the influences of reaction conditions and stability of MoO3/TiO2 catalyst on dibenzothiophene hydrodesulfurization of the chosen catalyst were tested in a fixed-bed reactor. Dibenzothiophene conversion rate could approach 100% under reaction temperature 280~300℃, hydrogen pressure 2.0 MPa, hydrogen/oil ratio 600 and LHSV 4 h-1. Furthermore, there was no obvious evidence of deactivation of the catalyst after running for a long time of over 1000 h.