TY - JOUR
T1 - Changes of intermediate-range structure in the course of crystallization of zeolite beta
AU - Inagaki, Satoshi
AU - Nakatsuyama, Kei
AU - Saka, Yuji
AU - Kikuchi, Eiichi
AU - Kohara, Shinji
AU - Matsukata, Masahiko
N1 - Funding Information:
The synchrotron radiation experiments were performed at the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal No. 2004A0434-ND1c-np and 2004B0025-ND1c-np). Analyses of HEXRD data were carried out using the software developed by Dr. Inamura (The University of Tokyo, Japan). We thank Prof. G. Sankar (The Royal Institution of Great Britain, London) and Prof. T. Okubo (The University of Tokyo, Japan) for their fruitful discussions. This study was partially supported by Grant-in-Aid for the 21COE Research Program “Practical Nano-Chemistry” from MEXT, Japan.
PY - 2007/4/19
Y1 - 2007/4/19
N2 - Silicate-ring structure in a dry silicate gel that can be transformed into zeolite beta by the steam-assisted crystallization (SAC) was investigated using high-energy X-ray diffraction (HEXRD). In total correlation function, T(r), determined from HEXRD data, a dry gel that was crystallized to zeolite beta exhibited a remarkable peak at 3.8 Å corresponding to second-neighbor Si-O separations in a 4-membered ring (4MR). The 29Si NMR results supported the existence of a large number of 4MRs in the dry gel with TEA+/Si = 0.37. The 4MRs in the dry gel, which are derived from double 3-memebered ring (D3R) structures stabilized by TEA+ in TEA+-silicate solution, are essential in the formation of zeolite beta by the SAC method.
AB - Silicate-ring structure in a dry silicate gel that can be transformed into zeolite beta by the steam-assisted crystallization (SAC) was investigated using high-energy X-ray diffraction (HEXRD). In total correlation function, T(r), determined from HEXRD data, a dry gel that was crystallized to zeolite beta exhibited a remarkable peak at 3.8 Å corresponding to second-neighbor Si-O separations in a 4-membered ring (4MR). The 29Si NMR results supported the existence of a large number of 4MRs in the dry gel with TEA+/Si = 0.37. The 4MRs in the dry gel, which are derived from double 3-memebered ring (D3R) structures stabilized by TEA+ in TEA+-silicate solution, are essential in the formation of zeolite beta by the SAC method.
KW - Dry gel
KW - Silicate-ring structure
KW - Steam-assisted crystallization
KW - Zeolite beta
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U2 - 10.1016/j.micromeso.2006.10.039
DO - 10.1016/j.micromeso.2006.10.039
M3 - Article
AN - SCOPUS:33947656519
SN - 1387-1811
VL - 101
SP - 50
EP - 56
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-2 SPEC. ISS.
ER -