Abstract
High-energy X-ray diffraction, 29Si nuclear magnetic resonance and Raman spectroscopy were applied to investigate medium-range structures in *BEA-type zeolite containing tetraethylammonium (TEA+) cation. In particular, the intermediates to form *BEA were focused the subject of focus. Double three-membered silicate rings (D3Rs) stabilized by TEA+ cation existed in the mother TEA+-silicate solution to prepare a dry gel that gave *BEA-type zeolite by the steam-assisted crystallization method. The D3R units transformed "4-2"-type secondary building units (SBUs) in the course of preparing the dry gel. Such "4-2"-type SBUs remained in the dry gel and played a significant role in the crystallization of *BEA-type zeolite. On the basis of these observations, we proposed that the presence of "4-2"-type SBUs in the dry gel is essential for the formation of *BEA-type zeolite in the steam-assisted crystallization, suggesting a plausible formation scheme of the periodic structure of *BEA-type zeolite in a long-range order via rearrangement of "4-2"-type SBUs.
| Original language | English |
|---|---|
| Pages (from-to) | 10285-10293 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry C |
| Volume | 111 |
| Issue number | 28 |
| DOIs | |
| Publication status | Published - 2007 Jul 19 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
Cite this
Elucidation of medium-range structure in a dry gel-forming *BEA-type zeolite. / Inagaki, Satoshi; Nakatsuyama, Kei; Saka, Yuji; Kikuchi, Eiichi; Kohara, Shinji; Matsukata, Masahiko.
In: Journal of Physical Chemistry C, Vol. 111, No. 28, 19.07.2007, p. 10285-10293.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Elucidation of medium-range structure in a dry gel-forming *BEA-type zeolite
AU - Inagaki, Satoshi
AU - Nakatsuyama, Kei
AU - Saka, Yuji
AU - Kikuchi, Eiichi
AU - Kohara, Shinji
AU - Matsukata, Masahiko
PY - 2007/7/19
Y1 - 2007/7/19
N2 - High-energy X-ray diffraction, 29Si nuclear magnetic resonance and Raman spectroscopy were applied to investigate medium-range structures in *BEA-type zeolite containing tetraethylammonium (TEA+) cation. In particular, the intermediates to form *BEA were focused the subject of focus. Double three-membered silicate rings (D3Rs) stabilized by TEA+ cation existed in the mother TEA+-silicate solution to prepare a dry gel that gave *BEA-type zeolite by the steam-assisted crystallization method. The D3R units transformed "4-2"-type secondary building units (SBUs) in the course of preparing the dry gel. Such "4-2"-type SBUs remained in the dry gel and played a significant role in the crystallization of *BEA-type zeolite. On the basis of these observations, we proposed that the presence of "4-2"-type SBUs in the dry gel is essential for the formation of *BEA-type zeolite in the steam-assisted crystallization, suggesting a plausible formation scheme of the periodic structure of *BEA-type zeolite in a long-range order via rearrangement of "4-2"-type SBUs.
AB - High-energy X-ray diffraction, 29Si nuclear magnetic resonance and Raman spectroscopy were applied to investigate medium-range structures in *BEA-type zeolite containing tetraethylammonium (TEA+) cation. In particular, the intermediates to form *BEA were focused the subject of focus. Double three-membered silicate rings (D3Rs) stabilized by TEA+ cation existed in the mother TEA+-silicate solution to prepare a dry gel that gave *BEA-type zeolite by the steam-assisted crystallization method. The D3R units transformed "4-2"-type secondary building units (SBUs) in the course of preparing the dry gel. Such "4-2"-type SBUs remained in the dry gel and played a significant role in the crystallization of *BEA-type zeolite. On the basis of these observations, we proposed that the presence of "4-2"-type SBUs in the dry gel is essential for the formation of *BEA-type zeolite in the steam-assisted crystallization, suggesting a plausible formation scheme of the periodic structure of *BEA-type zeolite in a long-range order via rearrangement of "4-2"-type SBUs.
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U2 - 10.1021/jp0668044
DO - 10.1021/jp0668044
M3 - Article
VL - 111
SP - 10285
EP - 10293
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 28
ER -