Formation of Intermediate Phases during Crystallization of Aluminophosphate and Silicoaluminophosphate Sieves with the AEL Structure

• Published in: Petroleum chemistry Vol. 60; no. 4; pp. 451 - 458
• Main Authors: Agliullin, M. R., Kuvatova, R. Z., Kutepov, B. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2020; Springer; Springer Nature B.V
• Subjects: Aluminum phosphate; Chemistry; Chemistry and Materials Science; Crystallization; Industrial Chemistry/Chemical Engineering; Molecular sieves; NMR; Nuclear magnetic resonance; Silicoaluminophosphates; X ray powder diffraction; Zeolites; silicoaluminophosphate molecular sieves; zeolites; hydroisomerization; intermediate phases
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544120040027

Using X-ray powder diffraction analysis,
27
Al and
31
P magic angle spinning nuclear magnetic resonance, and nitrogen adsorption–desorption, it has been shown that, during the crystallization of AlPO
4
-11 and SAPO-11 molecular sieves, the use of pseudoboehmite as an aluminum source leads to the formation of intermediate phases, which are crystalline aluminophosphates AlPO
4
· 2H
2
O and isostructural silicoaluminophosphates with a mesoporous structure.