Aluminium-27 NMR investigation of the 2-hydroxyethyl(trimethyl)-ammonium aluminosilicate solution

Alkaline solutions containing both silicate and aluminate ions are of considerable research interest inter alia because of their involvement in the synthesis of zeolites. Al-27 NMR spectra of alkaline aluminosilicate solutions generally show a maximum of five broad bands. In the present work, we use Al-27 NMR to characterize aluminosilicate solutions with different Al/Si ratios using 2-hydroxyethyl(trimethyl)ammonium as a cation template, no alkaline metals are used for preparation of aluminosilicate solutions. To understand the reaction between silicate and aluminate ions in this system, the evolutions of Al-27 NMR spectra with time are investigated.