27Al NMR STUDY OF THE EFFECT OF AQUEOUS AND METHANOLIC MEDIA ON TETRAPHENYLAMMONIUM ALUMINOSILICATE SPECIES
N. Goudarzi
Shahrood University of Technology, P. O. Box 316, Shahrood, Iran
goudarzi@shahroodut.ac.ir
Ключевые слова: 27Al NMR spectroscopy, tetraphenylammonium hydroxide, evolution with time, methanolic aluminosilicate solutions
Страницы: 266-274
Подраздел: ИССЛЕДОВАНИЕ СТРОЕНИЯ МОЛЕКУЛ ФИЗИЧЕСКИМИ МЕТОДАМИ
Аннотация
The effects of tetraphenylammonium (TPhA) on the equilibrium distribution of aluminosilicate oligomers in aqueous and methanolic alkaline aluminosilicate solutions were investigated using
27Al NMR spectroscopy. Alkaline solutions containing both silicate and aluminate ions are of considerable research interest inter alia because of their involvement in the synthesis of zeolites. In the present work, we use
27Al NMR to characterize alkaline aqueous and methanolic tetraphenylammonium (TPhA) aluminosilicate solutions with different Al/Si ratios. Tetraphenylammonium (TPhA) used as a cation template and no alkaline metals are used for preparation of aluminosilicate solutions. The distribution of aluminosilicate species was affected by the presence of the alcohol such as methanol and the method of mixing the silicate and aluminosilicate solutions. To understand the reaction between silicate and aluminate ions in this system, the evolutions of
27Al NMR spectra with time are investigated.
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