Elucidation of medium-range structure in a dry gel-forming *BEA-type zeolite

Satoshi Inagaki, Kei Nakatsuyama, Yuji Saka, Eiichi Kikuchi, Shinji Kohara, Masahiko Matsukata*

*この研究の対応する著者

研究成果: Article査読

39 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)10285-10293
ページ数9
ジャーナルJournal of Physical Chemistry C
111
28
DOI
出版ステータスPublished - 2007 7月 19

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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