Synthesis and characterization of gallium-beta zeolite from fluoride-containing media

✍ Scribed by J.E. Hazm; P. Caullet; J.L Paillaud; M. Soulard; L. Delmotte

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 335 KB
• Volume: 43
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(00)00334-6

✦ Synopsis

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 ¯uoride-containing aqueous gels having Si/Ga ratios between 5 and in®nity. 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.