Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
The catalysts in this work are primarily performed by Cr6+ adsorption on Fe3O4 via the water treatment process. During adsorption, Cr6+ could be transformed to Cr3+ via chemical reduction on Fe3O4 surface. In-situ/operando TRXAS approach is a useful technique to reveal the improvement in the catalytic activity of the Fe3O4 structure for CO2 reduction by Cr promotor. The Cr species adsorbed on Fe3O4 catalysts are determined by XAS analysis. Different Cr-structures on the Fe3O4 catalysts are observed depending on the adsorbed Cr-concentration. Catalytic activity and selectivity of CO2 reduction are determined by connecting GC and MS to TRXAS system. A low concentration of Cr-adsorbed Fe3O4 shows high catalytic activity to CO2 conversion and improves selectivity to CO production. In addition, the stability of the Fe3O4 structure in CO2 reduction process is improved by a low Cr-content promotor. On the contrary, a high Cr-content catalyst reveals fast re-oxidation of the reduced Fe3O4 structure.
This research was supported by the Fundamental Fund of Khon Kaen University (FF66). The experimental facilities were supported Department of Chemistry, Faculty of Science, Khon Kaen University, and the Synchrotron Light Research Institute, Thailand.
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