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A sponge-like small pore zeolite with great accessibility to its micropores

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Abstract

Small pore zeolites, due to pore size constraint, have limited applications. Post-modification on the materials is therefore important to widen their use. A CHA-type zeolite (SSZ-13) with a unique sponge-like structure is obtained by fluoride leaching. The development of macroporosity started from the crystal surfaces and continued progressively into the crystal by prolonging the treatment. Nitrogen physisorption measurements showed an increase in micropore volume and specific surface area as a consequence of the dissolution of the low crystallinity part of the zeolite. The effect of etching on the accessibility through the pore network, evaluated by means of breakthrough experiments on CO2/N2 and CO2/CH4 binary mixtures, showed an improved accessibility thanks to the interconnected macropores which shorten the diffusion pathlength. The set of experimental data shows the sponge-like SSZ-13 crystals retaining the intrinsic zeolitic properties but having an improved accessibility and crystallinity.

Graphical abstract: A sponge-like small pore zeolite with great accessibility to its micropores

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Supplementary files

Article information


Submitted
28 Feb 2020
Accepted
02 Apr 2020
First published
02 Apr 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

A sponge-like small pore zeolite with great accessibility to its micropores

K. Haw, S. Moldovan, L. Tang, Z. Qin, Q. Fang, S. Qiu and V. Valtchev, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00261E

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