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Engineering In2O3 catalysts using dielectric barrier discharge plasma for selective CO2 conversion to CO

Lookup NU author(s): Dr Kui Zhang

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Abstract

© 2025 Elsevier B.V.The conversion of carbon dioxide into valuable C₁ resources not only enhances its economic value but also represents a promising strategy for mitigating climate change. Non-thermal plasma technology has been demonstrated as an effective approach for the transformation of this molecule into high-value compounds. In this study, nanostructured In2O3 catalysts rich in oxygen vacancies and high surface area were synthesized through a novel method integrating chemical precipitation with dielectric barrier discharge (DBD) treatment. The synergistic effects on carbon dioxide conversion were explored through the combined application of DBD plasma and the In2O3 catalyst. The results demonstrate that oxygen vacancies in the catalyst play a crucial role in promoting this process. Notably, when laboratory-prepared catalyst was loaded into the reactor, the CO2 conversion efficiency can reach 29.7 % under optimal conditions, which is a 50.7 % increase compared to the CO2 conversion rate of the empty DBD plasma. Meanwhile, the CO selectivity can also be maintained at a high level of over 90 %. The commercial and home-made In2O3 catalyst samples were analyzed using XRD, SEM, XPS, EPR, and BET techniques. Furthermore, a mechanism for DBD plasma-enhanced CO2 conversion using the In2O3 catalyst was proposed, informed by both experimental outcomes and DFT calculations. The integration of these experimental and theoretical insights has refined the understanding of the microscopic reaction mechanisms involved in decomposing CO2 to CO and O2 on In2O3 catalyst facilitated by dielectric barrier discharge plasmas. This work not only bridges a gap in theoretical research but also provides important implications for future studies on plasma-mediated CO₂ conversion.

Publication metadata

Author(s): Li S, Wang Y, Zhang K, Zhu H, Liao G, Li Q, Jia S, Feng Q, Pan J, Tan R, Feng Z, Yang D

Publication type: Article

Publication status: Published

Journal: Journal of Alloys and Compounds

Year: 2025

Volume: 1039

Print publication date: 10/09/2025

Online publication date: 28/08/2025

Acceptance date: 25/08/2025

ISSN (print): 0925-8388

ISSN (electronic): 1873-4669

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.jallcom.2025.183304

DOI: 10.1016/j.jallcom.2025.183304

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