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Mechanical performance and CO2 uptake of ion-exchanged zeolite A structured by freeze-casting

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)2607-2618
Number of pages12
JournalJournal of the European Ceramic Society
Volume35
Issue number9
DOIs
Publication statusPublished - 2015
Publication typeA1 Journal article-refereed

Abstract

Zeolite 4A has been freeze-cast into highly porous monoliths with a cylindrical shape. The brittle monoliths, with lamellar or columnar pores and wall thicknesses between 8 and 35μm, show a compressive mechanical response along the main pore axis that could be modeled by a buckling behavior. The failure strength is proportional to the density and the amount of transverse bridging across lamella, which was shown to be related to the pore cross-sectional aspect ratio. Monoliths with highly anisotropic pores with a cross-sectional aspect ratio higher than 3 yielded sequentially from the top surface, whereas monoliths with a pore aspect ratio lower than 3 were found to delaminate into longitudinal splinters. The freeze-cast monoliths show a sharp gas breakthrough front with a 1:9 mixture of CO<inf>2</inf> and N<inf>2</inf>, indicating rapid uptake kinetics of the lamellar structures.

Keywords

  • Freeze-casting, Laminate, Mechanical strength, Porous ceramics, Zeolite A

Publication forum classification

Field of science, Statistics Finland