Synthesis of microporous titano-alumino-silicate ETAS-10 with different framework aluminum contents

Optimized synthesis conditions for obtaining highly crystalline microporous titano-alumino-silicate ETAS-10 materials with different framework aluminu m contents (Al/Ti molar ratio 0.1-0.48) have been reported. Samples with lo w Al contents (Al/Ti - 0.10) have been prepared using anatase and pseudoboe hmite as, respectively, the Ti and Al sources. Good quality ETAS-10 materia ls with Al framework contents above 0.35 have been obtained using a modific ation of the synthesis procedure that involves drying and calcining the par ent gel prior to the hydrothermal treatment. Changing the K and Na cation c omposition of the parent gel allows the fine-tuning of the framework Al con tent. It has been found that Si-29 MAS NMR spectroscopy provides the best m eans of assessing the framework Al content of ETAS-10 materials. (C) 2001 E lsevier Science B.V. All rights reserved.