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

Research output: Contribution to journalArticle

30 Citations (Scopus)

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 languageEnglish
Pages (from-to)10285-10293
Number of pages9
JournalJournal of Physical Chemistry C
Volume111
Issue number28
DOIs
Publication statusPublished - 2007 Jul 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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