Changes of intermediate-range structure in the course of crystallization of zeolite beta

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

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume101
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2007 Apr 19

Keywords

  • Dry gel
  • Silicate-ring structure
  • Steam-assisted crystallization
  • Zeolite beta

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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