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Fast synthesis of hierarchical Al-free Ti-BEA plate-like nanocrystals from low-templated dry gel via a steam-assisted conversion method

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Abstract

A hierarchical nanosized Ti-BEA zeolite was prepared via a green steam-assisted conversion (SAC) method taking inorganic titanium source as the raw material. Neither aluminum source nor hydrofluoric acid was required, instead, only a bit of template agent (TEAOH/SiO2 = 0.2) and 2 days period were sufficient, much less than that reported (TEAOH/SiO2 ≥ 0.55, 7–14 days). Comprehensively, the role of seeds, alkali ions, and ion exchange on the physicochemical properties of Ti-BEA products were investigated via a series of characterization. Innovatively, the tetracoordinated Ti active sites could be directly constructed by a simple ion exchange process instead of conventional acid washing; furthermore, the mechanism of ion exchange inducing Ti coordination transformation was also proposed to guide other titanosilicate zeolites. Excellent Ti active sites, surface properties, and textural properties endowed the Ti-BEA catalyst with excellent activity over cyclohexene epoxidation, while its synthesis procedure and cost were far better than reported.

Graphical abstract: Fast synthesis of hierarchical Al-free Ti-BEA plate-like nanocrystals from low-templated dry gel via a steam-assisted conversion method

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Article information


Submitted
11 Nov 2019
Accepted
06 Jan 2020
First published
08 Jan 2020

Green Chem., 2020, Advance Article
Article type
Paper

Fast synthesis of hierarchical Al-free Ti-BEA plate-like nanocrystals from low-templated dry gel via a steam-assisted conversion method

Y. Luo, Y. Zhu, J. Pan and X. Chen, Green Chem., 2020, Advance Article , DOI: 10.1039/C9GC03869H

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