Abstract
Ordered hexagonal mesoporous silica material (JLU-30) has been successfully synthesized in alkaline media at high temperature (>160 °C), using cationic (1,3-dimethyl-2-imidazolidin-2-ylidene)hexadecylmethylammonium bromide (DIHAB) as a template, and characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption−desorption isotherms, differential thermal analysis (DTA), and thermogravimetric analysis (TG), as well as 27Al and 29Si nuclear magnetic resonance (NMR) spectroscopy. Mesoporous JLU-30 shows much higher hydrothermal stability than MCM-41. 29Si NMR spectra indicate that the pore walls of JLU-30 samples synthesized at high temperature (160 °C) are fully condensed, giving a Q4/Q3 ratio as high as 6.2. In contrast, MCM-41 synthesized at relatively low temperature (100 °C) shows the Q4/Q3 + Q2 ratio at 1.1. Such unique structural feature might be responsible for the observed highly hydrothermal stability of the mesoporous silica materials (JLU-30). Furthermore, ...
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