Investigation on the cyclic CO₂ capture behaviour and degradation mechanism of molten salt promoted MgO derived from commercial hydromagnesite
File(s)
Published version
Author(s)
Chakraborty, Sumit
Fennell, Paul
Type
Journal Article
Abstract
This study examines the cyclic CO2 capture performance and degradation mechanism of molten salt-promoted MgO, a low-cost and scalable precursor, derived from commercially available hydromagnesite. The material was modified using different nitrate-based molten salt compositions to enhance CO2 uptake. Among the formulations, single- and double-salt-promoted MgO exhibited the highest initial capture capacities; however, performance declined with repeated cycling. Notably, the single-salt system demonstrated comparatively better stability over 10–22 cycles than others. The observed reduction in CO2 capture capacity is attributed to the gradual loss and transformation of nitrate species, which reduces the effective molten phase and pore blockage. Thermodynamic analysis supports the conversion of active nitrate phases into less effective forms during cycling, while X-ray diffraction and ICP-MS confirm a decrease in nitrate content despite minimal change in overall sodium levels. These findings highlight the critical role of molten salt stability in sustaining CO2 capture performance and provide insight into the design of more durable MgO-based sorbents.
Date Issued
2026-06-19
Date Acceptance
2026-05-19
Citation
Carbon Capture Science & Technology, 2026, 19
ISSN
2772-6568
Publisher
Elsevier
Journal / Book Title
Carbon Capture Science & Technology
Volume
19
Copyright Statement
© 2026 The Authors. Published by Elsevier Ltd on behalf of Institution of Chemical Engineers (IChemE). This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ ).
License URL
Publication Status
Published
Article Number
100633
Date Publish Online
2026-05-19