Evaluation of Cation-Exchanged Zeolite Adsorbents for Post-Combustion Carbon Dioxide Capture

Published

October 15, 2012

Author(s)

Tae-Hyun Bae, Matthew Ross Hudson, Jarad A. Mason, Wendy Queen, J.J. Dutton, Kenji Sumida, Ken J. Micklash, Steven S. Kaye, Craig Brown, Jeffrey R. Long

Abstract

A series of zeolite adsorbents was evaluated for potential application in post-combustion (CO₂) capture. Among zeolites tested, Ca-A showed the highest CO₂ uptake together with an excellent CO₂ selectivity over N₂ at conditions relevant to capture from a dry flue gas stream. Calculated isosteric heats of adsorption indicated a strong interaction between CO₂ and the Ca-A framework. Neutron and x-ray powder diffraction studies revealed the precise adsorption sites of CO6d2^ in Ca-A. A detailed study of CO₂ adsorption kinetics revealed that the performance of Ca-A is not limited by slow CO₂ diffusion in pores. Significantly, Ca-A exhibited higher volumetric CO₂ uptake and CO₂/N₂ selectivity than Mg₂(dobdc), one of the best performing adsorbents. The excellent performance of Ca-A was also demonstrated in CO₂ breakthrough simulations.

Citation

Energy and Environmental Science

Volume

6

Issue

1

Pub Type

Journals

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Keywords

CO2 separation, zeolites, neutron diffraction, adsorption

Citation

Bae, T. , Hudson, M. , Mason, J. , Queen, W. , Dutton, J. , Sumida, K. , Micklash, K. , Kaye, S. , Brown, C. and Long, J. (2012), Evaluation of Cation-Exchanged Zeolite Adsorbents for Post-Combustion Carbon Dioxide Capture, Energy and Environmental Science, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911649 (Accessed May 10, 2024)