کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1649439 | 1007582 | 2010 | 4 صفحه PDF | دانلود رایگان |
SBA-3 mesostructured silica containing framework aluminum is reported here. This material was successfully synthesized using sodium aluminate via post synthesis method. The structural properties of this novel material were studied by X-ray diffraction and FTIR. The Al insertion was determined by 27Al-NMR and the acidity was monitored by infrared spectroscopy of Pyridine adsorption/desorption. The 27Al NMR results indicate that Al has been effectively incorporated into the framework of SBA-3 material by post-synthesis method. The bridging hydroxyl (Si3O–Al–OH) acid sites are observed after the adsorption of basic probe molecules, such as pyridine; this fact strongly supports the presence of Bronsted acid sites. The alumination of Si-SBA-3 produces stronger Brønsted acidity than the conventional mesoporous aluminosilicates.
Journal: Materials Letters - Volume 64, Issue 4, 28 February 2010, Pages 545–548