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Issue 1, 2013
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Evaluation of cation-exchanged zeolite adsorbents for post-combustion carbon dioxide capture

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Abstract

A series of zeolite adsorbents has been evaluated for potential application in post-combustion CO2 capture using a new high-throughput gas adsorption instrument capable of measuring 28 samples in parallel. Among the zeolites tested, Ca-A exhibits the highest CO2 uptake (3.72 mmol g−1 and 5.63 mmol cm−3) together with an excellent CO2 selectivity over N2 under conditions relevant to capture from the dry flue gas stream of a coal-fired power plant. The large initial isosteric heat of adsorption of −58 kJ mol−1 indicates the presence of strong interactions between CO2 and the Ca-A framework. Neutron and X-ray powder diffraction studies reveal the precise location of the adsorption sites for CO2 in Ca-A and Mg-A. A detailed study of CO2 adsorption kinetics further shows that the performance of Ca-A is not limited by slow CO2 diffusion within the pores. Significantly, Ca-A exhibited a higher volumetric CO2 uptake and CO2/N2 selectivity than Mg2(dobdc) (dobdc4− = 1,4-dioxido-2,5-benzenedicarboxylate; Mg-MOF-74, CPO-27-Mg), one of the best performing adsorbents. The exceptional performance of Ca-A was maintained in CO2 breakthrough simulations.

Graphical abstract: Evaluation of cation-exchanged zeolite adsorbents for post-combustion carbon dioxide capture

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Publication details

The article was received on 31 Aug 2012, accepted on 28 Sep 2012 and first published on 16 Oct 2012


Article type: Paper
DOI: 10.1039/C2EE23337A
Citation: Energy Environ. Sci., 2013,6, 128-138
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    Evaluation of cation-exchanged zeolite adsorbents for post-combustion carbon dioxide capture

    T. Bae, M. R. Hudson, J. A. Mason, W. L. Queen, J. J. Dutton, K. Sumida, K. J. Micklash, S. S. Kaye, C. M. Brown and J. R. Long, Energy Environ. Sci., 2013, 6, 128
    DOI: 10.1039/C2EE23337A

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