Title: EFFECTS OF TiO_2 ON HYDRODESULFURIZATION PERFORMANCE OF Ni-Mo/MCM-41
Abstract: TiO2 modified Ni-Mo/MCM-41 hydrodesulfurization(HDS) catalysts were prepared by a consecutive impregnation method,and the effects of TiO2 as well as its introduction order on the HDS performance of Ni-Mo/MCM-41 were studied by using a model fuel of decalin containing 0.8% DBT.The UV-Vis,TPR and NH3-TPD results indicated that both the coordination states,the reducibility as well as the surface acidity of the oxidic precursor of Ni-Mo/MCM-41 were not remarkably affected by the introduction of TiO2.The HDS results showed that the addition of TiO2 suppressed the direct desulfurization pathway(DDS) activity of Ni-Mo/MCM-41,but significantly enhanced its hydrogenation pathway(HYD) activity,leading to an enhanced global HDS activity.The promoting effect was more pronounced when TiO2 was introduced after the impregnation of Ni-Mo over MCM-41.On the base of the product compositions,it is suggested that the improved HYD and HDS activities of TiO2-containg Ni-Mo/MCM-41 catalysts may be attributed to the enhanced acidity of the sulfides.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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