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《Chemical Research In Chinese Universities》 2003-08
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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)  
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.
【Fund】: 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
【CateGory Index】: TB34
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