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

Abstract

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

CLC Number:

O614

TrendMD:

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[J]. Chem. J. Chinese Universities, 2003, 24(8): 1351.

References

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