以体系自催化作用有效制备高分散的纳米AlMCM-41  

Facile synthesis of highly dispersed nanometer-sized mesoporous aluminosilicates via self-catalytic effect of specific system

作　　者：张建强[1] 赵吉祥[2] 翟尚儒[2] 武贺娟[2] 陈传东[2] 

机构地区：[1]天津华北地质勘查局五一四地质大队,河北承德067000 [2]大连工业大学化工与材料学院,辽宁大连116034

出　　处：《大连工业大学学报》2010年第3期205-208,共4页Journal of Dalian Polytechnic University

摘　　要：以阳离子型表面活性剂十六烷基三甲基溴化铵(CTAB)作为模板剂,利用体系中引入的硝酸铝原位水解生成的弱酸性环境可有效催化正硅酸乙酯(TEOS)快速水解的特点,再通过引入无机前驱体聚合催化剂氨水的合成路线制得高度分散和孔道规整的纳米级含铝介孔分子筛材料。借助于扫描电镜、高分辨透射电镜、X光衍射谱、等温N2-吸附-脱附以及固体铝核磁共振技术等有效测试手段对产物进行了详尽表征,并探讨了研究条件下硅源前驱体的水解-缩聚过程机理。研究结果证实,通过分步引入适量酸性铝盐和碱性氨水的技术路线可方便得到长程有序的纳米AlMCM-41介孔材料,体现出设计路线的可控性特点。Highly dispersed nanometer-sized mesostructured aluminosilicates with ordered framework structures have been facilely prepared via a novel two-step synthetic process,in which the pre-hydrolysis and afterward fast-assembly of inorganic species（TEOS） can be conveniently promoted by acidic aluminum salt and basic catalyst,respectively,in the presence of cationic surfactant（CTAB） as template.The product was characterized by advanced techniques as FE-SEM,HRTEM,XRD,N2-adsorption/desorption isotherms and 27Al MAS NMR etc.,and the plausible mechanism involved on the hydrolysis and condensation of silica species during this system was also discussed.Characterization results showed that highly ordered nanoscale AlMCM-41 mesoporous materials could be facilely prepared by introducing determined amount of acidic aluminum salt and basic ammonia water with a controllable manner.

关 键 词：纳米材料 介孔材料 缩聚 自组装 

分 类 号：TQ252.3[化学工程—有机化工]