Keggin结构三维有序大孔PMo_(12)-SiO_2材料的制备与表征  

Preparation and characterization of three-dimensionally ordered macroporous PMo_(12)-SiO_2 with Keggin structure

作　　者：杨卫亚[1] 郑经堂[2] 沈智奇[1] 王丽华[1] 凌风香[1] 

机构地区：[1]抚顺石油化工研究院,辽宁抚顺113001 [2]中国石油大学重质油国家重点实验室,山东东营257061

出　　处：《应用化工》2007年第9期909-912,共4页Applied Chemical Industry

摘　　要：以三维有序大孔SiO2为载体,采用等体积浸渍法将Keggin结构的12-磷钼酸(PMo12)固载化,制备了三维有序大孔PMo12-SiO2材料,利用IR、TG-DTA、XRD、SEM及低温N2吸附等测试手段对制备的样品进行了表征。结果表明,负载后磷钼酸的热稳定性显著提高,经500℃焙烧后,其Keggin结构依然保持;负载后,样品具有三维有序的大孔结构;磷钼酸以微晶形式高度分散在载体的孔隙中,其对孔隙的填充作用使载体的比表面积由125.4 m2/g下降到24.4 m2/g。Three-dimensionally ordered macroporous SiO2 materials supported PMo12 with Keggin structure were successfully synthesized by incipient wetness method. The samples were characterized by TG-DTA, IR, SEM and N2 adsorption techniques. The thermal stability of composite was effectively improved and its Keggin structure was kept regardless of the calcinations at 500 ℃. The composite had a well-ordered array of hexagonally packed macropores by SEM observation. Phosphomolybdic acid in the form of crystallites was highly distributed in textural porosity consisting in the wall of 3 DOM, and its filling resulted into a steep decrease in BET surface area of 3DOM SiO2 from 125.4 m^2/g to 24.4 m^2/g.

关 键 词：磷钼酸 二氧化硅 三维有序大孔材料 KEGGIN结构 

分 类 号：O643[理学—物理化学]