Nonthermal Plasma‐Assisted CO2‐H2O Conversion over NiO and Co3O4 Supported on CeO2

Abstract

AbstractTransformation of CO2 into value‐added chemicals remains a key challenge. Herein, nonthermal plasma (NTP)‐activated CO2‐H2O conversion over BaTiO3‐mixed NiO/CeO2 (Ni/Ce+) and Co3O4/CeO2 (Co/Ce+) catalysts is demonstrated. In a continuous‐flow dielectric barrier discharge reactor and under ambient conditions, optimum Co/Ce+ showed formation rates of CO and O2 of (43.6 ± 3.1) and (20.8 ± 0.7) μmol g−1h−1, respectively. CO2 conversion was found to be dependent on a combination of the basicity of the catalyst surface, CO2 flow rate, plasma input power, and relative humidity. Subsequently, kinetic analysis suggested that the activation energies over Ni/Ce+, Co/Ce+, and NiCo/Ce+ are 35.68, 15.61, and 25.88 kJ mol−1, respectively. By combining these findings, a plausible reaction mechanism that can facilitate understanding the trend of product formation is also provided.