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Application of plasma catalysis system for C4F8 removal
Ya Sheng Chen1, Kuan Lun Pan1,2, Moo Been Chang3
1Graduate Institute of Environmental Engineering, National Central University, No.300, Zhongda Road, Zhongli District, Taoyuan City, 32001, Taiwan.
Summary
Octafluorocyclobutane (C4F8), a potent greenhouse gas, can be effectively decomposed using plasma catalysis. This combined system achieves 100% conversion efficiency, offering a promising solution for reducing C4F8 emissions.
Area of Science:
- Environmental Science and Engineering
- Chemical Engineering
- Plasma Science
Background:
- Octafluorocyclobutane (C4F8) is a potent greenhouse gas with a global warming potential (GWP100) 10,000 times that of CO2.
- Effective technologies for reducing C4F8 emissions are crucial due to its significant environmental impact.
Purpose of the Study:
- To investigate the decomposition of C4F8 using catalytic hydrolysis, non-thermal plasma, and plasma catalysis systems.
- To evaluate the efficiency and optimal conditions for C4F8 decomposition across different technological approaches.
Main Methods:
- Investigated three decomposition systems: catalytic hydrolysis, non-thermal plasma, and plasma catalysis.
- Optimized parameters including catalyst type (γ-Al2O3), temperature, water vapor concentration, applied voltage, gas flow rate, C4F8 concentration, O2 content, and Ar addition.
- Analyzed decomposition products such as CO2, NOx, COF2, and HF.
Main Results:
- Catalytic hydrolysis achieved a maximum efficiency of 20.1% under specific conditions (γ-Al2O3, 10% H2O(g), 800 °C).
- Non-thermal plasma reached 62% C4F8 conversion at 23 kV.
- Plasma catalysis demonstrated 100% C4F8 conversion efficiency at 22-23 kV, showing resilience to high gas flow rates and improved performance with Ar addition (20%) and optimal O2 content (0.5%).
Conclusions:
- Plasma catalysis is a highly effective method for C4F8 decomposition, achieving complete conversion under optimized conditions.
- The combined non-thermal plasma and catalyst system is feasible and shows significant potential for industrial development in greenhouse gas abatement.
- Understanding the reaction products (CO2, NOx, COF2, HF) is essential for process design and environmental safety.
