Solvent/OSDA-free interzeolite transformation of FAU into CHA zeolite with quantitative yield

An efficient and simple methodology was proposed to synthesize CHA zeolite without the use of solvent and OSDA. The synthesis strategy is based on a mechanochemical-assisted interzeolite transformation using only Na-type FAU zeolite and KOH as starting materials, for ease of handling and large-scale...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2019-04, Vol.278, p.219-224
Main Authors: Miyagawa, Sana, Miyake, Koji, Hirota, Yuichiro, Nishiyama, Norikazu, Miyamoto, Manabu, Oumi, Yasunori, Tanaka, Shunsuke
Format: Article
Language:English
Subjects:
CHA
FAU
High yield
Interzeolite transformation
OSDA-Free
Solvent-free
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Summary:An efficient and simple methodology was proposed to synthesize CHA zeolite without the use of solvent and OSDA. The synthesis strategy is based on a mechanochemical-assisted interzeolite transformation using only Na-type FAU zeolite and KOH as starting materials, for ease of handling and large-scale production. The role of KOH on crystal transformation behaviors and adsorption characteristics of the obtained CHA zeolite were investigated. The important factor was the loading KOH into the cages of starting FAU zeolite with adjusted appropriate amount. In this method, vapor-solid interzeolite transformation occurs by local rearrangement of silicon and aluminum species without accompanying macroscopic dissolution of FAU zeolite, resulting in formation of CHA zeolite maintaining the Si/Al ratio of the starting FAU zeolite. [Display omitted] •Highly versatile methodology to transform FAU zeolite into CHA zeolite without the use of solvent and OSDA.•CHA zeolite with the same Si/Al ratio as starting FAU zeolite could be achieved.•Mechanochemical-assisted interzeolite transformation using only Na-FAU and KOH for easy-to-use and large-scale production.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2018.11.037