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

Abstract

Transformation of CO 2 into value-added chemicals remains a key challenge. Herein, nonthermal plasma (NTP)-activated CO 2 -H 2 O conversion over BaTiO 3mixed NiO/CeO 2 (Ni/Ce + ) and Co 3 O 4 /CeO 2 (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 O 2 of (43.6 ± 3.1) and (20.8 ± 0.7) μmol g -1 h -1 , respectively. CO 2 conversion was found to be dependent on a combination of the basicity of the catalyst surface, CO 2 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.

Characterizing catalyst function and transformations in the plasma reduction of CO2 on atomic layer deposition-synthesized catalysts

“…Particles are generally deposited onto the support by capillary solvent adsorption or vapor deposition techniques. [19][20][21][22] The structure of the support and catalyst has been shown to influence the overall CO 2 conversion by affecting the true active catalytic surface area, the flow dynamics of reactant gases, and the electric field inside the discharge region. 9,[23][24][25] Specifically, the effects of macroscopic catalyst loading and morphology on plasma-catalyst interactions have been explored in other works.…”

Characterizing Catalyst Function and Transformations in the Plasma Reduction of CO 2 on Atomic Layer Deposition-Synthesized Catalysts

“…Particles are generally deposited onto the support by capillary solvent adsorption or vapor deposition techniques. [19][20][21][22] The structure of the support and catalyst has been shown to influence the overall CO2 conversion by affecting the true active catalytic surface area, the flow dynamics of reactant gases, and the electric field inside the discharge region. 9,[23][24][25] While the use of chemically synthesized, particulate catalysts may allow for convenient control during synthesis, the heterogeneity of the distribution can have significant effects on the process.…”