Extremely Stable Zeolites Developed via Designed Liquid-Mediated Treatment

Kenta Iyoki, Kakeru Kikumasa, Takako Onishi, Yasuo Yonezawa, Anand Chokkalingam, Yutaka Yanaba, Taiji Matsumoto, Ryota Osuga, Shanmugam P. Elangovan, Junko N. Kondo, Akira Endo, Tatsuya Okubo, Toru Wakihara

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Improving the stability of porous materials for practical applications is highly challenging. Aluminosilicate zeolites are utilized for adsorptive and catalytic applications, wherein they are sometimes exposed to high-temperature steaming conditions (∼1000 °C). As the degradation of high-silica zeolites originates from the defect sites in their frameworks, feasible defect-healing methods are highly demanded. Herein, we propose a method for healing defects to create extremely stable high-silica zeolites. High-silica (SiO2/Al2O3 > 240) zeolites with*BEA-, MFI-, and MOR-type topologies could be stabilized by significantly reducing the number of defect sites via a liquid-mediated treatment without using additional silylating agents. Upon exposure to extremely high temperature (900-1150 °C) steam, the stabilized zeolites retain their crystallinity and micropore volume, whereas the parent commercial zeolites degrade completely. The proposed self-defect-healing method provides new insights into the migration of species through porous bodies and significantly advances the practical applicability of zeolites in severe environments.

本文言語English
ページ(範囲)3931-3938
ページ数8
ジャーナルJournal of the American Chemical Society
142
8
DOI
出版ステータスPublished - 2020 2 26
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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