硅铝胶气相法合成MCM-22分子筛工艺条件的影响  

Effect of Synthesis of Zeolite MCM-22 by Vapor-Phase Transport Method with Aluminosilicate Gel

作　　者：刘星生[1] 金映[1] 李英霞[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《化学反应工程与工艺》2007年第5期416-421,共6页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(20676011)

摘　　要：以硅酸和偏铝酸钠为硅源和铝源制备硅铝胶,采用气相法合成MCM-22分子筛。考察了硅铝比、钠离子含量、模板剂六亚甲基亚胺(HMI)和水用量等工艺条件对合成的影响。结果发现,与水热晶化法相比,气相法合成中硅铝比范围变窄,所需Na^+含量大大降低,合成的MCM-22分子筛结晶更完整,晶粒直径较大。原料组成为SiO_2:(0.02～0.033)Al_2O_3:(0.085～0.1)Na^+:1.2HMI:20H_2O,晶化温度和时间分别为150℃和5～7d的实验合成条件较为适宜。Zeolite MCM-22 was synthesized by vapor-phase transport method （VPT） with silicic acid as silicon source and sodium aluminate as aluminum source. The effects of synthesis conditions, such as ratios of Si to Al, Na^＋ content, dosages of hexamethylene imine （HMI） and water, were investigated. The experiment results showed that narrower ratio of SiO2 to Al2O3 and lower Na＋ content were needed in VPT to synthesis more complete and larger grain diameter crystalline zeolite MCM-22, compared to the hydrothermal synthesis （HTS）. The suitable conditions for synthesis of zeolite MCM-22 were the feed with SiO2 ： （0.02-0. 033）Al2O3 ： （0. 085-0.1）Na^＋ ： 1.2HMI ： 20H2O, crystallization temperature 150 ℃ and crystallization time 5-7 days.

关 键 词：硅铝胶 气相法 工艺条件 MCM-22分子筛 

分 类 号：O643[理学—物理化学]