Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 57, Issue 1, Pages 9-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1387-1811(02)00530-9
Keywords
synthesis; colloidal; silicalite-2; particle size; Si-29 MAS NMR; C-13 CP MAS NMR; FT-IR
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Colloidal TBA-silicalite-2 (MEL type) was hydrothermally synthesized in the reactant system TBAOH-TEOS-H2O. The influences of reactant composition, reaction temperature, and crystallization period on particle size of the zeolite were investigated. The colloidal silicalite-2 was characterized by XRD, SEM, TEM, FT-IR Si-29 MAS NMR, C-13 CP MAS NMR, thermogravimetric analysis and N-2 adsorption. The as-synthesized colloidal zeolite with a particle size of 100 nm is an agglomerate composed of nano-sized crystals of about 20 nm, displaying unique structural characteristics such as high content of silanol defects in the framework, splitting of the double-ring vibration in FT-IR spectrum and an unusual signal for methyl groups of TBA in C-13 CP MAS NMR spectrum. (C) 2002 Elsevier Science Inc. All rights reserved.
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