介孔硅层柱蒙脱石材料合成的新方法与表征  

A Novel Method for Preparing Mesoporous Silica Pillared Montmorillonite Material and Its Structure Characterization

作　　者：周春晖[1] 李庆伟[1] 葛忠华[1] 李小年[1] 倪哲明[1] 

机构地区：[1]浙江工业大学化工学院,多相催化浙江省重点实验室,杭州310014

出　　处：《高等学校化学学报》2003年第8期1351-1355,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 970 6 0 11);浙江省自然科学基金 (批准号 :2 0 10 5 7)资助

摘　　要：利用十六烷基三甲基溴化铵 (CTAB)将天然钠基蒙脱石改性成有机蒙脱石 ,以十二烷胺为模板剂 ,正硅酸乙酯为层柱前驱体 ,在室温下合成了新型介孔硅层柱蒙脱石材料 .用 XRD,TG,FTIR以及 N2 等温吸附 -脱附等技术对产物进行了表征 .结果表明 ,合成材料具有大通道 (净层间距为 2 .75 nm)、介孔孔径且孔分布窄 (平均孔径为 2 .1 7nm)、比表面积高 (SBET=82 1 .6 m2 /g)、热稳定性高 (大于 80 0℃ )等特征 .同时 ,通过改变中性胺的链长 ,研究了孔结构的调变规律 ,分析了材料的成孔机理和热稳定性提高的原因 .The mesoporous silica pillared clays, with porous montmorillonite(MMT) heterostructures, were synthesized by pillaring and template-assembly techniques. The purified MMT is modified by cetyltrimethylammonium bromide(CTAB). Mixtures of the modified MMT, dodecylamine(DDA) and tetraethylorthosilicate(TEOS) at MMT/DDA/TEOS molar ratios of 1∶20∶150 were allowed to react for 8 h. Then the resulted intercalates were centrifuged and dried in air. Finally after calcination at 540 ℃ for \{4 h\} to remove the organic templates, the novel silica porous MMT heterostructures(PMHs) were obtained. The resulted PMHs were characterized by XRD, TG, FTIR and N 2 adsorption-desorption isotherms. The results indicate that the PMHs possess mesopore(average pore size of 2.17 nm), super-gallery height of 2\^75 nm, a large BET specific surface area of 821.6 m 2/g and high thermal stability up to 800 ℃. Through changing the chain length of neutral amine used, the adjustment of pore and gallery height of PMHs has been explored. The mechanism of pore formation through gallery template-assembly was postulated, and the higher thermal stability of PMHs was ascribed to uniformity of pillars.

关 键 词：介孔硅层柱蒙脱石材料 合成方法 表征 催化材料 正硅酸乙酯 大通道 介孔孔径 孔结构 

分 类 号：TQ426.6[化学工程]