含有乙醚的无胺无氟反应物体系中高硅丝光沸石的合成  

Synthesis of High Silica MOR Zeolite in Amine-Free and Fluoride-Free Ether-Containing Reactant System

作　　者：汪靖[1] 程晓维[1] 杨晓蔚[1] 龙英才[1] 

机构地区：[1]复旦大学化学系上海市分子催化与新材料重点实验室,上海200433

出　　处：《化学学报》2008年第7期769-774,共6页Acta Chimica Sinica

摘　　要：研究含有乙醚的Na2O-Al2O3-SiO2-H2O反应物中高硅丝光沸石在413～453K下的水热合成.乙醚的存在能有效促进丝光沸石的结晶过程,且有助于提高产物结晶度和硅铝比.反应物胶体中硅铝比与碱度对产物的生成有关键作用.合成原料使用不同铝源,体系结晶规律相近,但产物的形貌和硅铝比有差异.在优化的反应条件下合成的高硅丝光沸石硅铝比达30左右.低温氮吸附与27Al魔角旋转核磁谱表征证实该沸石骨架结构完美,孔道开放畅通,其水热稳定性优于低硅丝光沸石.Hydrothermal synthesis of high-silica MOR type zeolite in the temperature range of 413 -433 K was investigated in amine-free and fluoride-fi-ee Na2O-Al2O3-SiO2-H2O reactant system using different alumina source in the presence of ether, which plays an effectively promoting role in the crystallization and the increment of the molar ratio of silica to alumina （SAR） for the zeolite. SAR and the alkalinity in the starting reactant gel make essential effects on the crystallization of the zeolite with a pure phase. The crystallization phenomena in the reactant prepared with different alumina sources are similar, except obvious differences in the morphology and SAR of the as-synthesized MOR zeolites. A pure phase MOR zeolite with SAR up to 30 was obtained in the reactant with optimum compositions under a certain reaction condition. Characterized by nitrogen sorption and ^27Al magic-angle spinning nuclear magnetic resonance, perfect framework and open channel system of the zeolite have been proved. The high silica MOR zeolite exhibits much more excellent hydrothermal stability than the low SAR one.

关 键 词：高硅 丝光沸石 乙醚促进 结晶 无胺 无氟 

分 类 号：O621.2[理学—有机化学]