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<p>Amid concerns about the progress of climate change, the development of effective utilization technologies of carbon dioxide (CO<sub>2</sub>) has gained significant attention as a means to sustainably reduce CO<sub>2</sub> concentration in the atmosphere. The reverse water-gas shift (RWGS) reaction (CO<sub>2</sub> + H<sub>2</sub> → CO + H<sub>2</sub>O) using CO<sub>2</sub> and hydrogen (H<sub>2</sub>) with a ratio of 1:1, which produces carbon monoxide (CO) employed as an essential feedstock in chemical industries, is a promising and practical strategy for effective utilization of CO<sub>2</sub>. This study investigates experimentally the non-catalytic RWGS reaction using microwave discharge plasma at atmospheric pressure. The microwave discharge plasma can be generated using a rod-electrode-type microwave plasma source (MPS). The CO<sub>2</sub> conversion, CO selectivity, CO yield, and specific energy input (SEI) are then evaluated in terms of the average transmission power to the rod-electrode-type MPS at a constant flow rate. The highest CO<sub>2</sub> conversion of 55.9%, CO selectivity of 90.6%, and CO yield of 50.7% are achieved at the SEI of approximately 2.5&#xa0;eV/molecule (equivalent to approximately 9.9&#xa0;kJ/L). On the other hand, the highest energy efficiency for the CO yield of 10.6% was achieved at the SEI of approximately 1.6&#xa0;eV/molecule (equivalent to approximately 6.5&#xa0;kJ/L). The findings highlight the potential of microwave discharge plasma as a viable approach for promoting the non-catalytic RWGS reaction at atmospheric pressure, offering a novel pathway for efficient CO<sub>2</sub> utilization.</p>

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Evaluation of Non-catalytic Reverse Water-Gas Shift Reaction Using Microwave Discharge Plasma at Atmospheric Pressure

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Hidenori Sekiguchi

摘要

Amid concerns about the progress of climate change, the development of effective utilization technologies of carbon dioxide (CO2) has gained significant attention as a means to sustainably reduce CO2 concentration in the atmosphere. The reverse water-gas shift (RWGS) reaction (CO2 + H2 → CO + H2O) using CO2 and hydrogen (H2) with a ratio of 1:1, which produces carbon monoxide (CO) employed as an essential feedstock in chemical industries, is a promising and practical strategy for effective utilization of CO2. This study investigates experimentally the non-catalytic RWGS reaction using microwave discharge plasma at atmospheric pressure. The microwave discharge plasma can be generated using a rod-electrode-type microwave plasma source (MPS). The CO2 conversion, CO selectivity, CO yield, and specific energy input (SEI) are then evaluated in terms of the average transmission power to the rod-electrode-type MPS at a constant flow rate. The highest CO2 conversion of 55.9%, CO selectivity of 90.6%, and CO yield of 50.7% are achieved at the SEI of approximately 2.5 eV/molecule (equivalent to approximately 9.9 kJ/L). On the other hand, the highest energy efficiency for the CO yield of 10.6% was achieved at the SEI of approximately 1.6 eV/molecule (equivalent to approximately 6.5 kJ/L). The findings highlight the potential of microwave discharge plasma as a viable approach for promoting the non-catalytic RWGS reaction at atmospheric pressure, offering a novel pathway for efficient CO2 utilization.