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Study on Relationship between Microstructure of Active Phase and HDS Performance of Sulfided ni-mo catalysts: Effect of Metal Loading

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China Petroleum Processing & Petrochemical Technology 2014年第2期16卷 12-19页

作者： Guo Rong Shen Benxian Fang Xiangchen Sun Jin Peng Chong Cui Xiaoli State Key Laboratory of Chemical Engineering East China University of Science and Technology Fushun Research Institute of Petroleum and Petrochemicals SINOPEC

Six ni-mo catalysts with different metal contents were prepared and characterized by N2 adsorption and X-ray diffi＇actometry. The active phase microstructure of these catalysts was examined by the Raman spectroscopy, temperature- programmed reduction （TPR）, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. Hydrodesulfurization （HDS） activity of catalyst samples were analyzed in a flow fixed-bed microreactor. The sulfidation degree of mo and the length of the moS2 slab slightly increased with the amount of metal loaded following sulfidation. This small change is attributed to polymolybdate species observed in all the oxidized catalysts. Weak metal-support interactions, as determined by the TPR technique, increased the niSx sulfidation phase and moS2 slab stacking. The HDS activity of the catalyst samples increased with the number of active sites. For high metal loading catalysts, their HDS activity was nearly identical because the sulfur atoms cannot easily approach active sites. This change is caused by the large number of stacked layers in the moS2 slabs as well as the decrease in the specific surface area and pore volume of the catalyst samples with an increasing metal loading.

关键词： ni-mo catalysts hydrodesulfurization sulfidation microstructure metal loading

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