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.
出处
《化学反应工程与工艺》
EI
CAS
CSCD
北大核心
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)
关键词
硅铝胶
气相法
工艺条件
MCM-22分子筛
luminosilicate gel
vapor-phase transport
conditions of synthesis
MCM-22 zeolite,
