| Abstrakt: |
Dichlorodifluoromethane (CCl2F2/CFC-12) is widely used as refrigerant, foaming agent and aerosol propellant in industry. Due to its chemical stability, CCl2F2 gradually diffuses from the troposphere to the stratosphere once released and catalyzes the destruction of ozone through photodegradation. In addition, CCl2F2 is listed as a potent greenhouse gas with a high global warming potential (GWP = 10.2). Current technologies for treating CCl2F2 include combustion, catalysis, and plasma destruction. This study aims to develop a catalyst with good activity and integrate it with plasma to form a hybrid system for the removal of CCl2F2 from gas streams. The results obtained show that combined plasma with catalyst (plasma catalysis system) is effective in removing CCl2F2 and the highest removal efficiency of 99.0% is achieved for the operating conditions of applied voltage 17 kV, gas flow rate 500 sccm, [CCl2F2] = 800 ppm and [O2] =1%. Nitrogen atoms, excited N2 molecules such as N2(A³ ∑u +) N* ( 4 S, 2 D, ² P) and high-energy electrons generated by plasma are beneficial for the removal mechanism of CFC-12. In the presence of oxygen, the main byproducts of CCl2F2 conversion include CO2, CClF3, N2O and NOX. This study confirms that addition of Mn into TiO2 greatly improves the removal efficiency of CCl2F2 and this system has good potential for industrial application. [ABSTRACT FROM AUTHOR] |
