介孔硅层柱蒙脱石材料合成的新方法与表征

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (8): 1351.

介孔硅层柱蒙脱石材料合成的新方法与表征

周春晖, 李庆伟, 葛忠华, 李小年, 倪哲明

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

收稿日期:2002-09-18 出版日期:2003-08-24 发布日期:2003-08-24
通讯作者: 葛忠华(1941年出生),男,教授,博士生导师,从事催化新材料和非金属矿应用研究.
基金资助:
国家自然科学基金(批准号:29706011);浙江省自然科学基金(批准号:201057)资助

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

ZHOU Chun-Hui, LI Qing-Wei, GE Zhong-Hua, LI Xiao-Nian, NI Zhe-Ming

Zhejiang Provincial Key Laboratory of Heterogeneous Catalysis, College of Chemical Technology, Zhejiang University of Technology, Hangzhou 310014, China

Received:2002-09-18 Online:2003-08-24 Published:2003-08-24

摘要/Abstract

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2.75nm)、介孔孔径且孔分布窄(平均孔径为2.17nm)、比表面积高(SBET=821.6m²/g)、热稳定性高(大于800℃)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.

关键词: 介孔材料, 蒙脱石, 合成, 层柱

Abstract: The mesoporous silica pillared clays, with porous montmorillonite(MMT) heterostructures, were synthesized by pillaring and template-assembly techniques.The purified MMTis modified by cetyltrimethylammonium bromide(CTAB).Mixtures of the modified MMT, dodecylamine(DDA) and tetraethylorthosilicate(TEOS) at MMT/DDA/TEO Smolar ratios of 1∶20∶150 were allowed to react for₈h.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 MMTheterostructures(PMHs) were obtained.The resulted PMHs were characterized by XRD, TG, FTIRand N₂adsorption-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 BETspecific surface area of 821.6m₂/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.

Key words: Mesoporous material, Montmorillonite, Synthesis, Pillar

中图分类号:

O614

TrendMD:

周春晖, 李庆伟, 葛忠华, 李小年, 倪哲明. 介孔硅层柱蒙脱石材料合成的新方法与表征. 高等学校化学学报, 2003, 24(8): 1351.

ZHOU Chun-Hui, LI Qing-Wei, GE Zhong-Hua, LI Xiao-Nian, NI Zhe-Ming . A Novel Method for Preparing Mesoporous Silica Pillared Montmorillonite Material and Its Structure Characterization. Chem. J. Chinese Universities, 2003, 24(8): 1351.

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