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Binderless zeolite NaX microspheres with enhanced CO2 adsorption selectivity
Nanjing Tech University, Nanjing, China.
Nanjing Tech University, Nanjing, China.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Luleå University of Technology.ORCID iD: 0000-0003-2656-857x
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2019 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 278, p. 267-274Article in journal (Refereed) Published
Abstract [en]

Zeolite NaX@NaA core-shell microspheres were prepared via a post-treatment secondary growth of zeolite NaA films on outer surface of binderless zeolite NaX microspheres. The obtained core-shell microspheres were composed of intergrown octahedral NaX particles inside, with particles size of ca. 500–750 nm, and continuous zeolite NaA films on the outer surface with the thickness of about 2 μm. Higher CO2 separation performance was observed for the core-shell microspheres comparing to the parental binderless zeolite NaX microspheres. The ideal separation factors of zeolite NaX@NaA core-shell microspheres for CO2/CH4 and CO2/N2 were 13 and 47, and the adsorption selectivities for the corresponding binary mixtures were 308 and 923, significantly higher than the binderless zeolite NaX microspheres of 9 and 19 as well as 264 and 735, respectively. After K+ ion exchanging, the core-shell zeolite microspheres have even higher adsorption selectivities of 326 and 1109 for CO2/CH4 and CO2/N2 binary mixtures. The crushing strength of the binderless zeolite NaX microspheres was increased from 0.46 MPa to 3.42 MPa after the secondary growth. In addition, the growth of zeolite A film was resultant from interzeolite conversion and the interzeolite conversion was investigated by the conversion of zeolite NaX to NaA crystals in NaA membrane synthesis gel.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 278, p. 267-274
Keywords [en]
Zeolite, Core-shell microsphere, Membrane, Interzeolite conversion, CO2 separation
National Category
Chemical Engineering Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-72574DOI: 10.1016/j.micromeso.2018.12.002ISI: 000459841900032Scopus ID: 2-s2.0-85057613263OAI: oai:DiVA.org:ltu-72574DiVA, id: diva2:1279134
Note

Validerad;2019;Nivå 2;2019-01-25 (svasva)

Available from: 2019-01-15 Created: 2019-01-15 Last updated: 2019-04-12Bibliographically approved

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Yu, Liang

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