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《Acta Petrolei Sinica (Petroleum Processing Section)》 2005-04
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ROLE OF Ni IN Ni-W/Si-MCM-41 HYDRODESULFURIZATION CATALYSTS

LI Xiang~(1, 2), WANG An-jie~(1, 2), SUN Zhong-chao~1, LI Chu~1, HU Yong-kang~(2, 3)(1. State Key Laboratory of Fine Chemicals,Dalian University of Technology, Dalian 116012, China; 2. Liaoning Key Laboratory of Petrochemical Technology and Equipment, Dalian 116012 ,China; 3. Fushun Research Institute of Petroleum and Petrochemicals,SINOPEC,Fushun, 113001,China)  
The kinetics of hydrodesulfrization (HDS) of dibenzothiophene (DBT) catalyzed by Ni-W/Si-MCM-41 was studied by using a model mixture containing 0.2%-0.8%(mass fraction) DBT in decalin. The results indicated that Ni-W/Si-MCM-41 with the Ni/W molar ratio of 0.75 exhibited the lowest HDS apparent activation energy (E_(HDS)) and hydrogenolysis apparent activation energy (E_(HYG)), whereas the apparent activation energy of hydrogenation reaction (E_(HYD)) decreased with the increase of the Ni/W molar ratio, which suggested that the two reactions take place on different types of catalytic sites. It was further confirmed by the results of UV-Vis and TPR that the active site of hydrogenation was correlated with the octahedrally coordinated Ni species, while the hydrogenolysis activity of Ni-W was related with the reducibility of NiO-WO_3 species.
【Fund】: 国家自然科学基金(20003002 20333030);; 辽宁省中青年学科带头人;; 教育部博士点专项基金(20030141026);; CNPC中青年创新基金(200341)资助项目
【CateGory Index】: TE624.9
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