Effect of structural aluminium on the mesoporous structure of MCM-41

Z H LUAN, H Y HE, W Z ZHOU, C F CHENG, J KLINOWSKI

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153 Citations (Scopus)

Abstract

X-Ray diffraction (XRD), Al-27 magic-angle-spinning (MAS) NMR, N-2 adsorption measurements and transmission electron microscopy (TEM) show that the one-dimensional channels of the mesoporous aluminosilicate MCM-41 containing only structural (four-coordinate) aluminium are much shorter in the sample with an Si/Al ratio of 34.1 (ca. 160 Angstrom) than in purely siliceous MCM-41 (ca. 400 Angstrom). The quality of the XRD patterns rapidly deteriorates as the aluminium content of the solid increases. However, aluminosilicate MCM-41 still preserves a perfect mesoporous structure with an average pore diameter of ca. 30 Angstrom, a surface area of 990 m(2) g(-1) and a pore volume of 0.74 cm(3) g(-1). When the Na+ form of aluminosilicate MCM-41 is transformed into the Bronsted acidic H+ form, and some of the aluminium is removed from the structure, the uniform hexagonal mesopores partially collapse and macropores 20-2000 Angstrom in diameter are formed.

Original languageEnglish
Pages (from-to)2955-2959
Number of pages5
JournalJournal of the Chemical Society, Faraday Transactions
Volume91
Issue number17
DOIs
Publication statusPublished - 7 Sept 1995

Keywords

  • LIQUID-CRYSTAL TEMPLATE
  • SOLID-STATE

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