海泡石制备MCM-41和AlMCM-41介孔分子筛研究  

Study on Preparation of MCM-41 and AlMCM-41 Mesoporous Molecular Sieves from Sepiolite

作　　者：王宇菲[1] 常燕[2] 万翠凤[2] 杨敏[3] 金胜明[2] 

机构地区：[1]湖南冶金职业技术学院,湖南株洲412000 [2]中南大学资源加工与生物工程学院无机材料系,湖南长沙410083 [3]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《非金属矿》2007年第1期37-39,共3页Non-Metallic Mines

摘　　要：海泡石用盐酸处理后,在NaOH溶液或含铝的碱性溶液中100℃处理24h,得到具有MCM-41结构特征的介孔分子筛。两种溶液中形成的MCM-41的比表面积分别为804m2.g-1和470m2.g-1、孔径分别为3.0nm和2.8nm,且孔径分布窄;NaOH溶液中形成的MCM-41具有板状和圆形孔结构,而NaAlO2溶液中形成的AlMCM-41具有圆形孔结构。IR结果表明,海泡石脱镁后形成无定形二氧化硅,表面有游离羟基存在,晶化后,硅链表面的羟基缩聚成环状结构。Ordered hexagonal mcsoporous silica （MCM-41） is prepared directly from sepiolite using ball milling, acidic leaching and sequent template synthesis in the NaOH or NaAlO2 solution at 100℃ for 24h. The structure, pore size distribution and specific surface area （SSA） of MCM-41 arc investigated by means ofSAXRD, IR and BET adsorption methods. The SSA and pore size of MCM-41 formed in NaOH solution is 804 m2·g^-1 and 3.0 nm respectively, associated with spherical pores and slit-like pores. The SSA and pore size of MCM-41 formed in NaAlO2 solution is 470 m2·g^-1 and 2.8 nm respectively, associated with spherical pores uniformly. IR results demonstrate that the amorphous silica formed with fre Si-OH radical after Mg was removed from sepiolite and the -OH groups on amorphous silica was condensed to form Si-O ring during crystallization.

关 键 词：海泡石 介孔分子筛 酸性浸出 MCM-41 

分 类 号：TQ424.25[化学工程]