摘要
利用沸石前驱体溶液和介孔硅球(MSS)为原料,通过水热法成功制备了具有中强酸性介孔壳的中空介孔硅铝球形分子筛(HMAS)。利用透射电镜(TEM)、扫描电镜(SEM)、X射线衍射(XRD)、N2-吸脱附、27Al核磁共振(27Al NMR)及NH3程序升温脱附(NH3-TPD)对材料的结构和性能进行了表征。研究结果表明,在MSS的中空过程中伴随有物质再分配和介孔结构的逐渐演变。MSS介孔孔道中的十六烷基三甲基溴化铵(CTAB)分子,一方面保护MSS免遭强碱性沸石前驱体溶液的溶蚀,另一方面作为形成HMAS介孔壳层的模板剂。在此CTAB分子的作用下,沸石前驱体结构单元被引入到HMAS的介孔球壳上。所得材料具有介孔结构和中强酸性,在催化裂解1,3,5-三异丙苯反应中表现出优异的催化性能。
Hollow mesoporous aluminosilicate spheres （HMAS） with middle strong acidity have been successfully synthesized by a facile hydrothermal treatment on mesoporous silica spheres （MSS） in zeolite precursor solution. The as-prepared materials were characterized by TEM, SEM, XRD, N2 adsorption-desorption, 27A1 NMR and NH3- TPD. The results showed that the hollowing process was associated with a progressive mass redistribution and changes of pores structures. The surfactant cetyhrimethylammonium bromide （CTAB） located in the pores of MSS protected the mesoporous silica spheres from dissolving into strongly basic zeolite precursor solution and acted as the template for mesoporous shell. Under the templating function of CTAB, primary zeolite units were introduced into the mesopore walls of HMAS. The obtained material HMAS had moderate acid strength. Catalytic tests showed that the catalysts exhibited high catalytic activity compared with the MSS and H^3 zeolite for catalytic cracking of 1, 3, 5-triisopropylbenzene.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2013年第10期2049-2056,共8页
Chinese Journal of Inorganic Chemistry
基金
辽宁省教育厅项目(No.L2012222)
辽宁工业大学教师科研基金(No.X201115)资助项目
关键词
中空
介孔分子筛
沸石前驱体
催化裂解
hollow
mesoporous silica
zeolite precursors
catalytic cracking
