含钒SBA-15介孔分子筛的制备及丙烷选择氧化反应  

Synthesis of V-SBA-15 Catalysts Employed for Selective Oxidation of Propane

作　　者：唐慜[1] 裴素朋[1] 岳斌[1] 贺鹤勇[1] 

机构地区：[1]复旦大学化学系,上海市分子催化和功能材料重点实验室,上海200433

出　　处：《复旦学报（自然科学版）》2012年第5期670-677,共8页Journal of Fudan University：Natural Science

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623506);上海市优秀学科带头人计划资助项目(10XD1400300);上海市重点学科建设资助项目(B108)

摘　　要：采用"pH-调节法"共合成得到不同钒含量的V-SBA-15催化剂,通过X射线粉末衍射、N_2吸附、透射电镜、拉曼光谱、^(51)V魔角旋转核磁共振谱、NH_3-程序升温脱附、H_2-程序升温还原等手段对催化剂进行表征,并研究了其丙烷选择氧化反应的催化活性.结果表明,V-SBA-15催化剂保持SBA-15介孔分子筛的两维六方孔道结构,低含量时钒以高分散的孤立态四面体形式存在于分子筛的骨架中,高含量时出现聚集态的氧钒八面体物种.低钒含量的催化剂具有低酸量的弱酸性位和较低温度下的还原性,在丙烷选择氧化脱氢反应中表现出较高的催化活性.V-SBA-15 catalysts with different content of vanadium were prepared through a ＂pH-adjusting＂ co-synthesis method. The catalysts were characterized with XRD, Nz sorption, TEM, Raman, slV NMR, NHz-TPD, and Hz-TPR techniques and their catalytic activity in selective oxidation of propane was investigated. The results indicated that the V-SBA-15 catalysts exhibited the ordered hexagonal structure similar to SBA-15. For the low V-loading catalysts with high catalytic activity the vanadium species were highly dispersed and mainly 4-coordinated. With increase of the loading, the appearance of octahedral vanadium species was observed which accounted for the decrease of catalytic activity.

关 键 词：共合成 V-sBA-15 高分散 丙烷 选择氧化 

分 类 号：O643.3[理学—物理化学]