Enhancing MgO efficiency in CO2 capture: engineered MgO/Mg(OH)2 composites with Cl-, SO42-, and PO43- additives

Hasanthi L Senevirathna; Shunnian Wu; Cathie Lee; Jin-Young Kim; Sang Sub Kim; Kewu Bai; Ping Wu

doi:10.1039/d3ra04080a

Enhancing MgO efficiency in CO₂ capture: engineered MgO/Mg(OH)₂ composites with Cl^-, SO₄^2-, and PO₄^3- additives

RSC Adv. 2023 Sep 20;13(40):27946-27955. doi: 10.1039/d3ra04080a. eCollection 2023 Sep 18.

Authors

Hasanthi L Senevirathna¹, Shunnian Wu¹, Cathie Lee¹, Jin-Young Kim², Sang Sub Kim², Kewu Bai³, Ping Wu¹

Affiliations

¹ Entropic Interface Group, Engineering Product Development, Singapore University of Technology and Design 8 Somapah Road 487372 Singapore wuping@sutd.edu.sg.
² Department of Materials Science and Engineering, Inha University Incheon 22212 Korea.
³ Institute of High Performance Computing, Agency for Science, Technology and Research Fusionopolis Way, #16-16 Connexis Singapore 138632 Singapore.

Abstract

The formation of a MgCO₃ shell hampers CO₂ capture efficiency in MgO. Our previous studies developed MgO/Mg(OH)₂ composites to facilitate CO₂ diffusion, improving capture efficiency. However, MgCO₃ still formed along the interfaces. To tackle this issue, we engineered the MgO/Mg(OH)₂ interfaces by incorporating Cl^-, SO₄^2-, and PO₄^3- additives. Novel MgO-H₂O-MgX (X = Cl^-, SO₄^2-, and PO₄^3-) composites were synthesized to explore the role of additives in preventing MgCO₃ formation. MgO-Mg(OH)₂-MgCl₂ nano-composites displayed enhanced CO₂ adsorption and stability. This breakthrough paves the way for effective bio-inspired strategies in overcoming CO₂ transport barriers in MgO-based adsorbents.