Issue 14, 2022

Structural modification of salt-promoted MgO sorbents for intermediate temperature CO2 capture

Abstract

MgO-based sorbents are a promising option for CO2 capture at intermediate temperatures. MgO-based sorbents are often hybridized with alkali metal salts to promote the CO2 capture performance. However, MgO-based sorbents often suffer a rapid decrement of CO2 capture performance during multicycle carbonation–calcination reactions due to the reduction of active sites. In this study, we attempted to enhance the durability of MgO-based sorbents by modifying their morphology. A tubular-shaped MgO-based sorbent was synthesized using a carbon nanotube template. Various characterization experiments and evaluations were performed with the synthesized MgO-based materials. The MgO sample with modified structure exhibited a specific morphology consisting of elongated plate-like structures separated by empty spaces. This separation is expected to prevent MgO agglomeration and preserve the modified morphology during iterative CO2 capture reactions. The MgO with modified structure achieved higher cycling stability with four times slower performance decay than the control MgO, even though identical chemical compositions were applied.

Graphical abstract: Structural modification of salt-promoted MgO sorbents for intermediate temperature CO2 capture

Supplementary files

Article information

Article type
Paper
Submitted
05 apr 2022
Accepted
09 iyn 2022
First published
10 iyn 2022
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2022,4, 3083-3090

Structural modification of salt-promoted MgO sorbents for intermediate temperature CO2 capture

D. Choi and Y. Park, Nanoscale Adv., 2022, 4, 3083 DOI: 10.1039/D2NA00213B

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