One-step template-free hydrothermal synthesis of partially Sr-incorporated hierarchical K-CHA zeolite microspheres

Kim, Min-Zy, Sharma, Pankaj ORCID: https://orcid.org/0000-0003-2319-260X, Kim, YoungJin, Alam, Syed Fakhar, Lee, Hye Ryeon and Cho, Churl Hee 2019. One-step template-free hydrothermal synthesis of partially Sr-incorporated hierarchical K-CHA zeolite microspheres. Microporous and Mesoporous Materials 286 , pp. 65-76. 10.1016/j.micromeso.2019.05.007

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Abstract

Partially Sr-incorporated hierarchical K-CHA zeolite microsphere of primary truncated bi-pyramidal crystallites was hydrothermally synthesized by one-step template-free hydrothermal process and the formation mechanism was investigated in detail. Its crystallization was accelerated by addition of strontium, and it was formed by three distinct steps: formation and aggregation of amorphous hollow nanospheres, collapse of agglomerated hollow nanospheres to multilayered disc, and rotational intergrowth into thread ball shape microsphere. The hollow nanosphere was formed by thermal expansion of Sr-coated solid silica nanoparticle, and the multilayered disc, by collapse of spherically aggregated hollow nanospheres. The collapse took place to minimize total surface energy by flattening sticky hollow spheres and oriented attachment of crystallites nucleated in the shell of hollow spheres. The multilayered disc grew finally to be thread ball shape microspheres. K-CHA zeolite microspheres displayed hierarchical character and showed excellent 298 K adsorptions for water (316 cm3 g−1), and CO2 (167.0 mg g−1 at 10 bar). The CO2/N2 adsorption selectivity was 10 due to incorporated potassium ions. Evidently, partially Sr-incorporated K-CHA zeolite microsphere was a good adsorbent for solvent dehydration and carbon capture.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	1387-1811
Date of Acceptance:	5 May 2019
Last Modified:	15 Nov 2022 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/153552

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