TY - JOUR
T1 - Formation of Al-rich nanocrystalline ZSM-5 via chloride-mediated, abrupt, atypical amorphous-to-crystalline transformation
AU - Mortola, Vanessa B.
AU - Ferreira, Adriana P.
AU - Fedeyko, Joseph M.
AU - Downing, Christopher
AU - Bueno, Jose M.C.
AU - Kung, Mayfair C.
AU - Kung, Harold H.
PY - 2010/9/21
Y1 - 2010/9/21
N2 - The efficient hydrothermal synthesis of highly crystalline, nano ZSM-5 particles, rich in framework Al content (Si/Al = 25) and low in the degree of intergrowth, in a medium of unusually high NaCl concentration was followed by examining the solids formed with 29Si, 27Al, 13C MAS NMR, TEM, DRIFT, and XRD spectroscopies. ZSM-5, in the form of 60 nm primary crystallites present as 100-150 nm dispersed cubic clusters, were crystallized from an amorphous phase via an abrupt, solid state transformation within 15 min at 165 °C. A model of the crystallization process was proposed, different from the typical nucleation-crystal growth process, in which aluminosilicate oligomers of low connectivity was salted out as amorphous solid as a result of high NaCl concentration immediately upon mixing of the ingredients.
AB - The efficient hydrothermal synthesis of highly crystalline, nano ZSM-5 particles, rich in framework Al content (Si/Al = 25) and low in the degree of intergrowth, in a medium of unusually high NaCl concentration was followed by examining the solids formed with 29Si, 27Al, 13C MAS NMR, TEM, DRIFT, and XRD spectroscopies. ZSM-5, in the form of 60 nm primary crystallites present as 100-150 nm dispersed cubic clusters, were crystallized from an amorphous phase via an abrupt, solid state transformation within 15 min at 165 °C. A model of the crystallization process was proposed, different from the typical nucleation-crystal growth process, in which aluminosilicate oligomers of low connectivity was salted out as amorphous solid as a result of high NaCl concentration immediately upon mixing of the ingredients.
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U2 - 10.1039/c0jm01374a
DO - 10.1039/c0jm01374a
M3 - Article
AN - SCOPUS:77955952788
SN - 0959-9428
VL - 20
SP - 7517
EP - 7525
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 35
ER -