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MgO-based double salt absorbent for warm temperature CO2 capture


EMSL Project ID
47698

Abstract

CO2 absorbent development also has gained attention for syngas clean up from fossil fuel power plants, and other industrial areas which produce a highly concentrated stream of CO2 as a byproduct, such as H2 production. For these warm syngas clean up processes, CO2 removal at warm temperature is preferred as it can eliminate the cooling/heating treatment of the gas stream and improve the thermal efficiency. MgO based absorbent was reported by S. G. Mayorga in a patent to be able to capture CO2 at 375 °C with a capacity of 11 mmol/g. This absorbent, however, is reported to have poor reproducibility and lack understanding on the absorption mechanism.
In this work, promoted MgO based double salt absorbents with novel structure and composition, catalyzed with newly identified compound, have been proposed which provide stable and regenerable 3.4~4.2 mmol/g capacity at 380 ~400 °C.. Further improvement is possible with the theoretical maximum capacity of 5.8 mmol/g for these absorbents. The focus of this proposal is to understand the mechanism of MgO reactivity activation with promoters in the absorbent mixture, and its reaction mechanism with CO2. Science of the interfacial phenomena at MgO and the promoter is expected to be critical for this study.

Project Details

Start Date
2012-10-01
End Date
2013-09-30
Status
Closed

Team

Principal Investigator

David King
Institution
Pacific Northwest National Laboratory

Co-Investigator(s)

Prabhakar Singh
Institution
University of Connecticut

Team Members

Keling Zhang
Institution
University of Connecticut

Mark Engelhard
Institution
Environmental Molecular Sciences Laboratory

Robert Dagle
Institution
Pacific Northwest National Laboratory

Xiaohong Li
Institution
Pacific Northwest National Laboratory

Related Publications

K. Zhang, X. Li, Y. Duan, D. L King, P. Singh, L. Li.; Roles of Double Salt Formation and NaNO3 in Na2CO3-Promoted MgO Absorbent for Intermediate Temperature CO2 Removal. Int. J. Greenhouse Gas Control, 12 (2013) 351-358.