2015. 56, 2 – . 266 – 274 UDC 541.67:546.621:546.21 27Al NMR STUDY OF THE EFFECT OF AQUEOUS AND METHANOLIC MEDIA ON DISTRIBUTION OF TETRAPHENYLAMMONIUM ALUMINOSILICATE SPECIES N. Goudarzi Faculty of Chemistry, Shahrood University of Technology, P. O. Box 316, Shahrood, Iran E-mail: goudarzi@shahroodut.ac.ir, goudarzi10@gmail.com Received August, 27, 2013 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. <...> Keywords: 27Al NMR spectroscopy, tetraphenylammonium hydroxide, evolution with time, methanolic aluminosilicate solutions. <...> INTRODUCTION The cation of the organic or inorganic base is considered to play a structure directing role in the synthesis of zeolites, an interesting but as yet poorly understood phenomenon. <...> This role is commonly discussed in terms of the cation having a templating function during the formation of the aluminosilicate framework from mixing of silicate and aluminate solutions. <...> However, the importance of the initial solution chemistry for the preparation of a specific zeolite structure has long been recognized [ 1, 2 ]. <...> It is clear that nucleation for zeolite formation and crystal growth occurs through the co-polymerization of aluminate and silicate ions in a solution mixture. <...> In principle, NMR spectroscopy is powerful tool for detecting and characterizing aluminum and silicon containing species in aqueous solution. <...> Kinrade and Swaddle identified 29Si-NMR peaks due to low molecular weight aluminosilicate anions of sodium aluminate solutions by 29Si NMR spectroscopy [ 18 ]. <...> They also reported the correlation between the partial charge on Si atoms and chemical shift was used <...>