High Water Tolerance of a Core-Shell-Structured Zeolite for CO2 Adsorptive Separation under Wet Conditions

Manabu Miyamoto; Shumpei Ono; Kodai Kusukami; Yasunori Oumi; Shigeyuki Uemiya

doi:10.1002/cssc.201800063

High Water Tolerance of a Core-Shell-Structured Zeolite for CO₂ Adsorptive Separation under Wet Conditions

ChemSusChem. 2018 Jun 11;11(11):1756-1760. doi: 10.1002/cssc.201800063. Epub 2018 May 18.

Authors

Manabu Miyamoto¹, Shumpei Ono², Kodai Kusukami², Yasunori Oumi³, Shigeyuki Uemiya¹

Affiliations

¹ Department of Chemistry and Biomolecular Science, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
² Department of Materials Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
³ Division of Instrument Analysis, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.

PMID: 29673091
DOI: 10.1002/cssc.201800063

Abstract

Dehumidification in CO₂ adsorptive separation processes is an important issue, owing to its high energy consumption. However, available adsorbents such as low-silica zeolites show a significant decrease in CO₂ adsorption capacity when water vapor is present. A core-shell-structured MFI-type zeolite with a hydrophilic ZSM-5 coated with a hydrophobic silicalite-1 shell layer was applied in CO₂ adsorptive separation under wet conditions. This hybrid material demonstrated remarkably high water tolerance with stable CO₂ adsorption performance without additional thermal treatment for regeneration, whereas a significant decrease in the CO₂ adsorption amount because of water vapor was observed on the parent ZSM-5. The core-shell structure of zeolites with high pore volumes, such as LTA or CHA, could also be suitable candidates for high CO₂ adsorption capacity and high water tolerance for practical applications.

Keywords: carbon dioxide; core-shell structures; gas separation; microporous materials; zeolites.