Comparison of disordered mesoporous aluminosilicates with highly ordered Al-MCM-41 on stability, acidity and catalytic activity

Dongyuan Zhao, Cong Nie, Yaming Zhou, Shijing Xia, Limin Huang, Quanzhi Li

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59 Citations (Scopus)

Abstract

A simple procedure has been described to directly synthesize hydrothermally stable, disordered mesoporous aluminosilicate materials with strong surface acidity by using a polymer aluminosilicate precursor, and cationic surfactant cetyltrimethylammonium bromide (CTAB) as the structure-directing agent. The comparison of stability, acidity and catalytic activity for the disordered mesoporous materials and Al-MCM-41 has been studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption/desorption, infrared spectra, NH3-temperature program desorption (NH3-TPD) and 27Al MAS NMR techniques. The results show that the disordered mesoporous materials are very similar to mesoporous material MCM-41 as regards its uniform mesopore sizes at the mean value of 3.0 nm, while the mesoporous channel arrangement is fully disordered similar to that for KIT-1 prepared by the additive of organic salts. Scanning electron microscopic (SEM) images show that the products have regular microscopic arrays and layer sheet-like morphology. The disordered mesoporous materials are hydrothermally more stable than highly ordered MCM-41. Furthermore, they show stronger acid strength and higher cracking activities than Al-containing MCM-41.

Original languageEnglish
Pages (from-to)11-20
Number of pages10
JournalCatalysis Today
Volume68
Issue number1-3
DOIs
Publication statusPublished - 1 Jul 2001
Externally publishedYes

Keywords

  • Al-MCM-41
  • Mesoporous materials
  • Scanning electron microscope
  • X-ray diffraction

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