A new approach to the determination of atomic-architecture of amorphous zeolite precursors by high-energy X-ray diffraction technique.
The structure of amorphous precursor species formed under hydrothermal conditions, prior to the onset of crystallization of microporous aluminosilicate zeolites, is determined employing high-energy X-ray diffraction (HEXRD). The investigation, combined with the use of reverse Monte Carlo modelling suggests that even numbered rings, especially 4R (R: ring) and 6R, which are the dominant aluminosilicate rings in zeolite A, have already been produced in the precursor. The model implies that the formation of double 4Rs occurs at the final step of the crystallization of zeolite A.
Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Toru
T
Wakihara
Shinji
S
Kohara
Gopinathan
G
Sankar
Seijiro
S
Saito
Manuel
M
Sanchez-Sanchez
Arian R
AR
Overweg
Wei
W
Fan
Masaru
M
Ogura
Tatsuya
T
Okubo
D000465:Algorithms; D000538:Aluminum Silicates / Q000737:chemistry; D018360:Crystallography, X-Ray; D009010:Monte Carlo Method; D017641:Zeolites / Q000737:chemistry*
D000538:Aluminum Silicates; D017641:Zeolites; C049037:aluminosilicate