OSDA-free synthesis of MTW-type zeolite from sodium aluminosilicate gels with zeolite beta seeds

Yoshihiro Kamimura, Kenta Iyoki, Shanmugam Palani Elangovan, Keiji Itabashi, Atsushi Shimojima, Tatsuya Okubo*

*この研究の対応する著者

研究成果: Article査読

61 被引用数 (Scopus)

抄録

Seed-assisted methods have provided a new route for the organic structure-directing agent (OSDA)-free synthesis of industrially valuable zeolites. In the present study, we have reported the discovery of the OSDA-free synthesis of ZSM-12 (MTW-type zeolite) by adding calcined zeolite beta seed crystals to the OSDA-free Na-aluminosilicate gel. Various parameters in this synthesis have been comprehensively investigated. Characterization by XRD, FE-SEM, ICP-AES, and 27Al MAS NMR showed that the obtained MTW products without impurity (SiO 2/Al 2O 3 = 31.8-46.4) possessed high crystallinity and a well-defined rod-like morphology. Adsorption-desorption isotherm of water and NH 3-TPD profiles of MTW product showed enough adsorption capacity for water and ammonia molecules, respectively. Moreover, considering the crystallization behavior of seeded and non-seeded Na-aluminosilicate gels, the following key factors were found for inducing the crystallization of MTW by zeolite beta seeds under the hydrothermal condition: the structural similarity between seeds and target zeolite, and the initial gel compositions that provide specific aluminosilicate precursors for the crystallization of MTW prior to the spontaneous nucleation of other zeolite. This methodology provides a promising approach toward designed syntheses of valuable zeolites under environmentally benign conditions.

本文言語English
ページ(範囲)282-290
ページ数9
ジャーナルMicroporous and Mesoporous Materials
163
DOI
出版ステータスPublished - 2012 11月 15
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学

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