水热法合成4A沸石分子筛的影响因素及其合成机理  

Influencing factors and synthesis mechanism of 4A zeolite molecular sieve by hydrothermal method

作　　者：湛雪辉[1] 肖忠良[1] 李飞[1] 周随安[1] 廖立华[1] 

机构地区：[1]长沙理工大学化学与生物工程学院,湖南长沙410114

出　　处：《化工矿物与加工》2009年第5期1-3,7,共4页Industrial Minerals & Processing

基　　金：国家自然科学基金(50774016);湖南省科技攻关项目(05GK3015;05JT1079)资助

摘　　要：采用水热法制备了4A沸石分子筛,研究了煅烧温度、氢氧化钠浓度、凝胶形成时间、晶化时间等因素对4A沸石分子筛的晶型的影响。高岭土煅烧温度小于900℃时得到A型沸石,高于950℃时得到P型沸石;氢氧化钠浓度小于5 mol/L时以P型沸石为主,大于5 mol/L时出现了一种新的沸石(Na6[AlSiO4]6.4H2O);凝胶形成时间长对X型沸石形成有利;晶化时间大于14 h时,出现的几乎全是P型沸石相,仅有少量的X型沸石相。4A zeolite molecular sieve is prepared by hydrothermal method and effects of some factors such as calcining temperature, sodium hydroxide concentration, gelling time, crystallization time on the crystal form of 4A zeolite molecular sieve are studied. A type zeo- lite will be produced if the calcination temperature of kaolin is less than 900 ℃ and P type zeolite will be primarily produced if tempera- ture is more than 950℃ ; P type zeolite will be obtained if sodium hydroxide concentration is less than 5 mol/L and a new kind of zeolite（Na6[AlSiO4]6·4H2O） will be produced if sodium hydroxide concentration is more than 5 mol/L. Gelling time is favorable to develop X form zeolite. P form zeolite is almost entirely developed if crystallization time is more than 14 hours.

关 键 词：水热法 沸石分子筛 煅烧温度 晶型 

分 类 号：TB34[一般工业技术—材料科学与工程]