Weakening internal diffusion effect in selective hydrodesulfurization of FCC gasoline by novel designed eggshell CoMoS/Al_2O_3 catalysts  

作　　者：Bin Liu Yongming Chai Yajing Wang Yunqi Liu Chenguang Liu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,Key Laboratory of Catalysis,China National Petroleum Corp.(CNPC),China University of Petroleum(East China),Qingdao 266555,Shandong,China

出　　处：《Journal of Natural Gas Chemistry》2012年第2期194-199,共6页天然气化学杂志（英文版）

基　　金：supported by grants from the Major State Basic Research Development Program of China ("973" Program, 2010CB226905);the National Natural Science Foundation of China (Grant Nos. 21006128 and 21106185);the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100133120007);the Shandong Provincial Natural Science Foundation of China (ZR2011BQ002);the Fundamental Research Funds for the Central Universities and the Graduate Innovation Project of China University of Petroleum (Grant No. CXZD11-06)

摘　　要：A simple method for preparation of presulfided eggshell CoMoS/γ-Al2O3 catalysts with sharp boundary is developed, through which the eggshell thicknesses of Co and Mo could be easily regulated by controlling the impregnation time. According to the results characterized by EDS, XRD, HRTEM and FT-IR of adsorbed CO, the active component structures, the nature and/or the amount of active sites on the eggshell catalyst are similar to these on the uniform catalyst. The evaluation results of the catalytic performance in selective hydrodesulfurization （HDS） of FCC gasoline show the presence of significant internal diffusion inhibition effect on HDS of S-compounds especially in the uniform catalyst. Compared with uniform catalyst, the eggshell catalyst could remarkably reduce such an internal diffusion inhibition effect due to a shortened diffusion path of the reactants, thus showing higher HDS activity and selectivity.A simple method for preparation of presulfided eggshell CoMoS/γ-Al2O3 catalysts with sharp boundary is developed, through which the eggshell thicknesses of Co and Mo could be easily regulated by controlling the impregnation time. According to the results characterized by EDS, XRD, HRTEM and FT-IR of adsorbed CO, the active component structures, the nature and/or the amount of active sites on the eggshell catalyst are similar to these on the uniform catalyst. The evaluation results of the catalytic performance in selective hydrodesulfurization （HDS） of FCC gasoline show the presence of significant internal diffusion inhibition effect on HDS of S-compounds especially in the uniform catalyst. Compared with uniform catalyst, the eggshell catalyst could remarkably reduce such an internal diffusion inhibition effect due to a shortened diffusion path of the reactants, thus showing higher HDS activity and selectivity.

关 键 词：CoMoS/γ-Al2O3 eggshell catalyst uniform catalyst internal diffusion HYDRODESULFURIZATION 

分 类 号：O643.36[理学—物理化学] TE624.41[理学—化学]