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Towards understanding mesopore formation in zeolite Y crystals using alkaline additives via in situ small-angle X-ray scattering

Gu, Junwen; Lin, Jiaqi; Smith, Andrew J; Soontaranon, Siriwat; Rugmai, Supagorn; Kongmark, Chanapa; Coppens, Marc-Olivier; (2022) Towards understanding mesopore formation in zeolite Y crystals using alkaline additives via in situ small-angle X-ray scattering. Microporous and Mesoporous Materials , 338 , Article 111867. 10.1016/j.micromeso.2022.111867. Green open access

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Abstract

The formation of micro/mesoporous zeolites by treating zeolite crystals with alkaline hydroxides has received a lot of interest, but fundamental understanding is still lacking. Here, we study the reactivity of a crystalline zeolitic material with various alkaline hydroxides, to close this knowledge gap. The use of ex situ and in situ small-angle X-ray scattering has allowed us to determine the reactivity of faujasite (FAU) type zeolite Y at different pH and Si/Al ratio (SAR), with a variety of different organic ammonium hydroxides. Supplemented with ex situ XRD and BET isotherm measurements, we show that the pH of the starting mixture and SAR of the zeolite significantly influence the stability of the microporous structure and the extent of formation of mesoporous material.

Type: Article
Title: Towards understanding mesopore formation in zeolite Y crystals using alkaline additives via in situ small-angle X-ray scattering
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.micromeso.2022.111867
Publisher version: https://doi.org/10.1016/j.micromeso.2022.111867
Language: English
Additional information: © 2022 Published by Elsevier Ltd. This is an open access article under the CC BY 4.0 license Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
Keywords: Microporous, Mesoporous, SAXS, Hierarchical and in situ
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10148910
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