Al_2O_3性质对加氢脱硫催化剂Co-Mo/Al2O3活性相形成的影响  

Effect of Alumina Supports on the Formation of Active Phase of Selective Hydrodesulfurization Catalysts Co-Mo/Al_2O_3

作　　者：齐和日玛[1,2] 李会峰[3] 袁蕙[3] 张韫宏[1] 徐广通[3] 

机构地区：[1]北京理工大学化学物理研究所,北京100081 [2]内蒙古医学院药学院,内蒙古呼和浩特010059 [3]中国石化石油化工科学研究院,北京100083

出　　处：《催化学报》2011年第2期240-249,共10页

基　　金：国家重点基础研究发展计划(973计划,2006CB202506);国家科技支撑计划(2007BAE43B01);石油化工催化材料与反应工程国家重点实验室2009年开放课题

摘　　要：以两种商用Al2O3为载体,制备了汽油选择性加氢脱硫催化剂Co-Mo/Al2O3,并采用红外光谱、X射线衍射、N2吸附-脱附、透射电镜、扫描透射-能谱和X射线光电子能谱等手段系统研究了载体物化性质对催化剂活性相形成的影响.结果表明,表面羟基数量少和结晶程度高的载体与活性金属间相互作用减弱,促进了Mo物种的硫化还原,使MoS2片晶的尺寸和层数增加,且其硫化态催化剂上CoMoS活性位更多,CoMoS/MoS2比更大,因而显著提高了相应Co-Mo催化剂加氢脱硫活性和选择性.Two different commercial alumina supports were used for the preparation of selective hydrodesulfurization（HDS） catalysts Co-Mo/Al2O3. The effect of support properties on the HDS activity and selectivity of the corresponding Co-Mo catalysts were studied by X-ray diffraction,Fourier transform infrared spectroscopy,transmission electron microscopy,scanning transmission electron microscopy-energy dispersive X-ray spectroscopy,and X-ray photoelectron spectroscopy. The HDS activity and selectivity were measured using a con-tinuous flow fixed-bed microreactor. The Al2O3 support with higher crystallinity and fewer hydroxyl groups had a moderate metal-support interaction,which resulted in an increase of the average slab length and stacking number of MoS2. This gave more formation of the active CoMoS phase and an increase in HDS activity and selectivity.

关 键 词：氧化铝 物化性质 钴 钼 加氢脱硫 活性相 

分 类 号：O643.36[理学—物理化学]