Enhancing the Reaction of CO₂ and H₂O Using Catalysts within a Nonthermal Plasma

Area of Science:

• Catalysis
• Plasma Technology
• Renewable Energy

Background:

• Direct conversion of carbon dioxide (CO2) and water (H2O) into fuels is essential for achieving net-zero emissions.
• Nonthermal plasma (NTP) technology offers a promising pathway for activating CO2 and H2O.

Purpose of the Study:

• To investigate the synergistic effects of Ni- and Cu-based catalysts with NTP for CO2 and H2O conversion.
• To identify the most effective catalyst system for hydrogen (H2) production.

Main Methods:

• Utilized Ni- and Cu-based catalysts in conjunction with NTP.
• Performed comprehensive catalyst characterization.
• Employed in situ diffuse reflectance infrared spectroscopy (DRIFTS) and mass spectrometry (MS) for reaction analysis.

Main Results:

• Catalysis under NTP conditions significantly enhanced CO2 conversion and product yield (nearly sixfold increase over plasma-only).
• Cu/ZSM5 catalyst achieved a maximum H2 concentration of ~2500 ppm at 17% CO2 conversion.
• Reduced copper species were identified as key promoters for CO2 and H2O conversion to H2.

Conclusions:

• Copper catalysts, particularly Cu/ZSM5, are highly effective for CO2 and H2O conversion to H2 when combined with NTP.
• CO is a major active species in the water-gas shift reaction pathway for H2 formation.
• Metal-support interactions play a crucial role in optimizing CO adsorption and reactivity with water.