Unlocking the Potential of Cu/Ti3C2Tx MXene Catalyst in Plasma Catalytic CO2 Hydrogenation
Plasma catalytic CO 2 hydrogenation has emerged as a promising approach for converting CO 2 into valuable chemicals such as CO, offering a potential solution to mitigate greenhouse gas emissions. In this study, we investigate the synergistic effect between plasma and a Cu/Ti 3 C 2 T x MXene catalyst for CO 2 hydrogenation via the reverse water gas shift (RWGS) reaction in a dielectric barrier discharge (DBD) reactor. Our findings reveal a significant enhancement in CO 2 conversion (33.1%) and CO yield (31.9%) when using the Cu/Ti 3 C 2 T x catalyst compared to plasma alone or with a Ti 3 C 2 T x foam. Plasma treatment creates unsaturated Ti sites on the Ti 3 C 2 T x surface, dramatically improving CO 2 adsorption and activation, while Cu nanoparticles significantly enhances the activation and dissociation of H 2 molecules on the catalyst surface. These surface adsorbed hydrogen species readily hydrogenate adsorbed CO 2 molecules through the Langmuir-Hinshelwood mechanism. Furthermore, these surface hydrogen species can also participate in the conversion of gas-phase CO 2 molecules through the Eley-Rideal pathway. This work sheds light on the synergistic plasma catalytic mechanism and provide insights for optimizing CO 2 hydrogenation processes using MXene catalysts.
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