期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 6, 期 1, 页码 128-138出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee23337a
关键词
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资金
- Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy (DoE)
- U.S. DoE [DE-AC02-06CH11357]
- NSF
- NIST National Research Council Postdoctoral Fellowship Research Associate program
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 N-2 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/N-2 selectivity than Mg-2(dobdc) (dobdc(4-) = 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.
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