Gliding arc plasma processing of CO2 conversion.

Area of Science:

• Plasma Science
• Chemical Engineering
• Environmental Science

Background:

• Carbon dioxide (CO2) conversion is crucial for mitigating greenhouse gas emissions.
• Nonthermal plasma methods offer potential for CO2 conversion but often face challenges with power efficiency.

Purpose of the Study:

• To investigate the conversion of CO2 using gliding arc plasma.
• To evaluate the impact of varying total gas flow rates and auxiliary gases (N2, O2, air, water) on CO2 conversion.
• To assess the system's power efficiency compared to other nonthermal plasma methods.

Main Methods:

• Utilized a gliding arc plasma system for CO2 conversion.
• Varied total gas flow rates.
• Introduced auxiliary gases including nitrogen (N2), oxygen (O2), air, and water (H2O).

Main Results:

• Achieved up to 18% CO2 conversion at a total gas flow rate of 0.8 L/min, producing CO and O2.
• Nitrogen (N2) was the only auxiliary gas to positively influence CO2 conversion.
• At 95% N2 concentration and 2 L/min total flow rate, power efficiency increased approximately threefold compared to pure CO2.

Conclusions:

• Gliding arc plasma is an effective method for CO2 conversion with higher power efficiency than other nonthermal plasma techniques.
• Nitrogen addition significantly enhances both CO2 conversion and power efficiency, indicating its potential as a beneficial co-reactant.
• The findings suggest a promising pathway for utilizing CO2 as a feedstock in chemical synthesis.