Synthesis of new microporous AlPO4 and substituted derivatives with the LTA structure

✍ Scribed by L. Sierra; C. Deroche; H. Gies; J.L. Guth

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 893 KB
• Volume: 3
• Category: Article
• ISSN: 0927-6513
• DOI: 10.1016/0927-6513(93)e0069-s

✦ Synopsis

Real AlPO, and (Si, Me = Co, Zn . . .)-substituted derivatives with the LTA structure crystallize from hydrogels containing tetramethylammonium cations, diethanolamine and fluoride anions under carefully controlled preparation conditions including mixing and aging steps. The structure determination from X-ray diffraction (XRD) data, obtained with a single crystal, shows that four different templates are located in four sites of the cages and cavities: F-in the D4R, N(CH,):

in the sodalite cage, diethanolamine and water in the eight-ring and near the six-ring of the large a cage, respectively. Chemical analysis, thermogravimetry (TG), difference temperature analysis (DTA) and magic-angle spinning nuclear magnetic resonance (MAS NMR) of 19F, 31P, 27A1 29Si and 13C results agree with the , structure determination results.