TY - JOUR
T1 - Crystallization of high silica BEA by dry gel conversion
AU - Hari Prasad Rao, P. R.
AU - Ueyama, K.
AU - Matsukata, M.
N1 - Funding Information:
P.R.H. thanks Japan Society for Promotion of Science, Japan, for a research fellowship. We thank GHAS laboratory for providing XRD facility.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1998/1/2
Y1 - 1998/1/2
N2 - Zeolite with BEA structure was prepared using a new crystallization method called 'Dry Gel Conversion Technique'. This dry gel conversion technique is a convenient method to prepare zeolites and enables one to synthesize zeolite BEA with SiO2/Al2O3 ratios from 30 to infinity using tetraethylammonium hydroxide (TEAOH) as a structure directing agent. Zeolite BEA with SiO2/Al2O3 ratios from 30 to 730 were rapidly crystallized in 3 and 12 h, respectively. The 27Al NMR spectrum for BEA with SiO2/Al2O3 ratio of 30 confirmed the absence of octahedrally coordinated aluminum. The crystallization rates were higher for BEA with low SiO2/Al2O3 ratios than for those with high SiO2/Al2O3 ratios. BEA crystallized by this method had uniform particles of about 60 nm. Higher Na+ ion concentrations in the gel promoted the formation of high silica BEA. Elimination of occluded TEA cations took place at lower temperatures (around 623 K) in high silica BEA than that in BEA with low SiO2/Al2O3 ratios (around 900 K). This method also allowed to synthesize BEA in the form of self-bonded pellets.
AB - Zeolite with BEA structure was prepared using a new crystallization method called 'Dry Gel Conversion Technique'. This dry gel conversion technique is a convenient method to prepare zeolites and enables one to synthesize zeolite BEA with SiO2/Al2O3 ratios from 30 to infinity using tetraethylammonium hydroxide (TEAOH) as a structure directing agent. Zeolite BEA with SiO2/Al2O3 ratios from 30 to 730 were rapidly crystallized in 3 and 12 h, respectively. The 27Al NMR spectrum for BEA with SiO2/Al2O3 ratio of 30 confirmed the absence of octahedrally coordinated aluminum. The crystallization rates were higher for BEA with low SiO2/Al2O3 ratios than for those with high SiO2/Al2O3 ratios. BEA crystallized by this method had uniform particles of about 60 nm. Higher Na+ ion concentrations in the gel promoted the formation of high silica BEA. Elimination of occluded TEA cations took place at lower temperatures (around 623 K) in high silica BEA than that in BEA with low SiO2/Al2O3 ratios (around 900 K). This method also allowed to synthesize BEA in the form of self-bonded pellets.
KW - Crystallization
KW - Dry gel conversion
KW - High silica zeolite
KW - Self-bonded zeolite pellet
KW - Zeolite BEA (beta)
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U2 - 10.1016/S0926-860X(98)80005-7
DO - 10.1016/S0926-860X(98)80005-7
M3 - Article
AN - SCOPUS:0042416808
SN - 0926-860X
VL - 166
SP - 97
EP - 103
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1
ER -