Synthesis of aluminophosphate and derived materials with the ZON structure-type

✍ Scribed by Ligia Sierra; Joël Patarin; Jean Louis Guth

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 509 KB
• Volume: 38
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(99)00259-0

✦ Synopsis

Materials with the ZON structure-type were synthesized between 120°C and 180°C from gels with the composition: v P 2 O 5 ; w Al 2 O 3 ; x SiO 2 ; y MeO; a (CH 3 ) 4 NCl; b HF; c (HOCH 2 CH 2 ) 2 NH; 80H 2 O. Diethanolamine was used as a pH modi®er without templating eects. The crystallization of AlPO 4 materials needs the presence of F À anions which compensate the M(CH 3 ) 4 N cationic template. The calcined AlPO 4 is stable and adsorbs water but not n-hexane, the eight-membered ring of the framework aperture being probably too distorted. Pure SAPO materials could be obtained with silica by decreasing the amount of F À in the gel in order to allow the formation of negative framework charges by the Si 6 P substitution. Nevertheless, sodalite-type SAPO is formed in the complete absence of F À . Co substituted easily for Al in the CoAPO-ZON, and the amount of F À necessary for the synthesis could be decreased to zero. No conditions were found for the preparation of a continuous series of materials with compositions between AlPO 4 and the completely substituted CoAPO. The substitution of Al by Zn was more dicult and no MgAPO-ZON could be obtained.