Microstructural evolution of condensed aggregates during the crystallization of ZSM-5 from a heterogeneous system

Document identifier: oai:DiVA.org:ltu-76317
Access full text here:10.1016/j.jcrysgro.2021.126188
Keyword: Engineering and Technology, Chemical Engineering, Chemical Process Engineering, Teknik och teknologier, Kemiteknik, Kemiska processer, Characterization, Crystal morphology, Hydrothermal crystal growth, Zeolite, Engineering Materials, Materialteknik, Chemical Technology, Kemisk teknologi
Publication year: 2021
Abstract:

The microstructural evolution of precursors of ZSM-5 zeolite crystallized from a heterogeneous system using fumed silica, sodium aluminate and tetrapropylammonium ions as reagents is investigated. Entities previously described by Ren et al. (Chem. Mater. 2012, 24, 10, 1726–1737) as condensed aggregates, were extensively studied using scanning electron microscopy, and energy dispersive spectroscopy. It was observed that the condensed aggregates first comprise a core of nanocrystals that is enveloped by a shell of amorphous gel phase. During crystallization, the amorphous shell surrounding the core is converted into ZSM-5 crystals that grow to a film surrounding the core. The crystals in the film grow competitively with nutrients provided by the liquid phase from the surroundings, while the nanocrystals in the core show little or no signs of growth.

Authors

Edgar Cardenas

Chemistry Research Institute, San Andrés Mayor University, UMSA, La Paz, Bolivia
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Wilson Aguilar

Department of Chemistry, Science and technology Faculty, San Simon University, Cochabamba, Bolivia
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Cheuk-Wai Tai

Department of Environmental and Materials Chemistry, Stockholm University, 106 91 Stockholm, Sweden
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Saul Cabrera

Chemistry Research Institute, San Andrés Mayor University, UMSA, La Paz, Bolivia
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Jonas Hedlund

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Johanne Mouzon

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