新型有机-无机杂化碱性介孔材料的合成——空间位阻对催化性能的影响  

Synthesis and Characterization of New Organic-inorganic Based Catalyst——Effect of Steric Hindrance on Catalytic Performance

作　　者：邵艳秋[1,2] 王虹苏[1] 管景奇[1] 于小芳[1] 刘恒[1] 阚秋斌[1] 

机构地区：[1]吉林大学化学学院,长春130021 [2]牡丹江师范学院化学系,牡丹江157012

出　　处：《高等学校化学学报》2010年第3期592-596,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20673046);牡丹江师范学院博士科研启动基金项目(批准号:MSB201001);青年学术骨干项目(批准号:G200902)资助

摘　　要：通过直接合成方法制备了2个二级胺功能化的SBA-15型有机-无机杂化碱性介孔材料.粉末X射线衍射分析、氮气吸附-脱附和透射电镜表征表明,合成的材料保持了SBA-15的有序介孔孔道结构,而热重、红外光谱和元素分析表明有机功能团被成功引入.在对硝基苯甲醛和丙酮的羟醛缩合反应中,相对于一级胺功能化的材料,二级胺功能化的SBA-15展示了极大改进的催化活性,这可能是由于具有更大空间位阻效应的有机功能团的引入导致了碱性胺中心催化活性增强.Two different hybrid secondary amine-functionalized mesoporous SBA-15 silica materials were synthesized by a direct synthesis method.X-ray diffraction（XRD）,N2 physisorption and transmission electron micrographs（TEM） showed that the prepared materials possessed similar mesoporous structure to pure siliceous SBA-15.Thermogravimetric analysis（TGA）,FTIR and elemental analysis of nitrogen indicated the successful introduction of corresponding organic functional groups into mesoporous materials.In the Aldol condensation of acetone with 4-nitrobenzaldehyde,two different hybrid secondary amine-functionalized mesoporous materials displayed enhanced catalytic performance in comparison to primary amine-functionalized materials.The possible reason is that the presence of organic functional groups with larger steric hindrance led to the enhanced catalytic performance of basic amino groups.

关 键 词：介孔 碱催化 空间位阻 

分 类 号：O643[理学—物理化学]