Al-MCM-41介孔分子筛的合成与表征

在碱性条件下,采用水热晶化法,以水玻璃为硅源,偏铝酸钠为铝源,十六烷基三甲基溴化铵为结构模板剂,成功合成出了含铝介孔分子筛Al-MCM-41.采用XRD,TEM,IR及N2吸附等表征手段研究了合成条件对Al-MCM-41介孔分子筛的的影响.结果表明,在pH值为11~13、模板剂与SiO2之比为0.07~0.20,120℃下晶化72h,以2℃/min的速率升温至550℃焙烧5h得到结晶度和有序性高的Al-MCM-41.N2吸附结果表明:合成的Al-MCM-41的孔容为0.942cm3/g,比表面积为1190m2/g,平均孔径为3.16nm,该分子筛具有较大的孔容、比表面积和较窄的孔径分布.

Synthesis and Characterization of mesoporous molecular sieve Al-MCM-41

Mesoporous molecular sieve Al-MCM-41 is synthesized in a basic medium by hydrothermal crystallization method,using sodium silicate as silicate source,sodium aluminate as aluminium source and cetyltrimethyl ammonium bromide as template.The effects of synthesis conditions on the quality of Al-MCM-41 are investigated by X-Ray ,TEM,IR and N2 adsorption-deadsorption .The results show that the mesoporous molecular sieve with good crystallization degree and ordered pore structure can be obtained when pH value is 11～13,the ratio of template to SiO2 is 0.07～0.20,the crystallizing time is 72 h at 120 ℃,the synthesized product is baked for 5 h to 550 ℃ at the heating rate of 2 ℃/min.The result of N2 adsorption-desadsorption shows pore-volume,BET special surface area and mean pore size of Al-MCM-41 are 0.942 cm3/g,1 190 m2/g and 3.16 nm separately.