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 language | English |
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Pages (from-to) | 11-20 |
Number of pages | 10 |
Journal | Catalysis Today |
Volume | 68 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1 Jul 2001 |
Externally published | Yes |
Keywords
- Al-MCM-41
- Mesoporous materials
- Scanning electron microscope
- X-ray diffraction