Abstract
A gallosilicate beta zeolite was prepared in the 150–200°C temperature range in the presence of the tetraethylammonium cation as the structuring agent from almost neutral fluoride-containing aqueous gels having Si/Ga ratios between 5 and infinity. Pure and fully crystallized beta samples could only be obtained from the gels with Si/Ga molar ratios higher than or equal to 20. The samples of zeolite beta were characterized by the usual techniques, i.e. powder XRD, SEM, chemical analysis, thermal analysis, N 2 adsorption isotherms and 29 Si , 71 Ga , 19 F and 13 C NMR spectroscopy.
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