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Internal structure of a gel leading to NBA-ZSM-5 single crystals
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Department of Chemistry, Faculty of Science and Technology, San Simon University, Cochabamba, Bolivia.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-1053-4623
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-4582-0902
2018 (English)In: Journal of porous materials, ISSN 1380-2224, E-ISSN 1573-4854Article in journal (Refereed) Epub ahead of print
Abstract [en]

Porous gel structures are formed during the synthesis of the zeolite ZSM-5 due to the reaction between a source of aluminosilicate, sodium hydroxide, water and a structure directing agent, such as e.g. tetrapropylammonium (TPA) or n-butylamine (NBA). In the present work, the formation of the gel in a heterogeneous system leading to the crystallization of NBA-ZSM-5 zeolite from leached metakaolin was studied extensively. The solid and liquid phases obtained after separation were analyzed by inductively coupled plasma sector field mass spectrometry, dynamic light scattering, extreme high resolution-scanning electron microscopy, energy dispersive spectroscopy, high resolution-transmission electron microscopy, X-ray diffraction and nitrogen gas adsorption. The main gel phase formed after hydrothermal treatment exhibited a sponge-like structure resembling those forming in (Na, TPA)-ZSM-5-based systems. For the first time, the walls of the main gel were shown to be inhomogenous and to possess a biphasic internal structure consisting of a mesoporous skeleton of aluminosilicate nanoparticles embedded in a silicate-rich soluble matrix of soft matter. The data presented in this paper is of primary importance to understand the mechanism by which the gel is consumed and contributes to the growth process of the zeolite crystals.

Place, publisher, year, edition, pages
Springer, 2018.
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-67592DOI: 10.1007/s10934-018-0568-5OAI: oai:DiVA.org:ltu-67592DiVA, id: diva2:1181823
Available from: 2018-02-09 Created: 2018-02-09 Last updated: 2018-02-12

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