Al MCM-41介孔分子筛的合成及表征

doi:10.3866/PKU.WHXB20101140

Abstract

Abstract:

Al MCM-41 mesoporous molecular sieves were synthesized by a hydrothermal method at 110 °C using the cationic surfactant cetyltrimethylammonium bromide as a template, sodium silicate as the silicon source, and pseudoboehmite as the aluminum source. The obtained Al MCM-41 molecular sieve was characterized by X-ray powder diffraction (XRD), N₂ adsorption-desorption, solid-state ²⁹Si, ²⁷Al magic angle spinning nuclear magnetic resonance (MAS NMR), scanning electron microscopy (SEM), and pyridine adsorption in Fourier transform infrared (FTIR) spectroscopy. The results showed that the Al MCM-41 molecular sieves had an ordered hexagonal packed structure, high relative crystallinity, high BET surface area, large pore volume, and a narrow pore size distribution. Furthermore, strong bonding between the silicon atoms in the Al MCM-41 framework resulted in good crystallization. The presence of the four-coordinate aluminum in the framework resulted in higher acidity.

Key words: Pseudoboehmite, Al MCM-41 mesoporous molecular sieves, Magic angle spinning nuclear magnetic resonance, Framework aluminum, Acidity

MSC2000:

O643

LIU Bai-Jun, MENG Qing-Lei, WANG Hui, MENG Qing-Min. Synthesis and Characterization of Al MCM-41 Mesoporous Molecular Sieves[J].Acta Phys. -Chim. Sin., 2010, 26(12): 3257-3262.

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Synthesis and Characterization of Al MCM-41 Mesoporous Molecular Sieves

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