介孔硅铝酸盐材料的合成、表征及催化应用  

Synthesis,Characterization and Application of Mesoporous Aluminosilicates Materials

作　　者：徐玲[1] 包呼和牧区乐[1] 王晓磊[1] 美春[1] 马媛媛[2] 刘宗瑞[1] 

机构地区：[1]内蒙古民族大学化学化工学院,内蒙古通辽028043 [2]吉林大学化学学院,长春130021

出　　处：《吉林大学学报（理学版）》2012年第6期1252-1256,共5页Journal of Jilin University:Science Edition

基　　金：内蒙古自治区自然科学基金(批准号:2011BS0203);内蒙古自治区高等学校科学研究项目(批准号:NJZY12121);内蒙古自治区高等学校青年科技英才支持计划项目

摘　　要：采用NaOH调节体系的pH值,通过改变造孔剂柠檬酸的加入量,制备了一系列新型介孔硅铝酸盐材料,并利用X射线衍射(XRD)、透射电镜(TEM)和N2吸附-脱附等进行表征,同时分析了不同柠檬酸加入量对材料孔结构的影响.结果表明:合成材料具有蠕虫状内交联的介孔结构,具有较强的酸性;柠檬酸与铝物质的量比为13的样品在苯酚与叔丁醇烷基化反应中具有较高的催化活性和对2,4-二叔丁基苯酚(2,4-DTBP)的选择性;较高的苯酚转化率和对2,4-DTBP的选择性主要归因于催化剂较强的酸性和较大的介孔孔径.A series of mesoporous aluminosilicate catalysts was synthesized from the synthesizing system with different amounts of citric acid （CA） as pore-forming agent and NaOH as pH adjusting agent. XRD, TEM and N2 adsorption characterization results confirm the presence of interconnected worm-like mesoporous structure in the mesoporous aluminosilicate catalysts. The effect of different amount CA on the porous structures of the mesoporous aluminosilicate materials was investigated. NH3-TPD characterization suggests that most of A1 was introduced into mesoporous framework and imparted acid sites. Catalytic test shows that the mesoporous aluminosilicate catalyst with n（CA）＂ n（A1）=13 exhibits higher catalytic activity than the other catalyst for the alkylation of phenol with tert-butanol. The excellent catalytic activity and high 2,4-di-TBP selectivity are mainly assigned to the acidity together with the large pore size of the mesoporous aluminosilicate catalyst.

关 键 词：介孔硅铝酸盐 柠檬酸 烷基化反应 苯酚叔丁基化 

分 类 号：O611[理学—无机化学]