Study on the reaction of CCl2F2 with CH4 in a dielectric barrier discharge nonequilibrium plasma
Kundu, S.K., Kennedy, E.M., Mackie, J.C., Holdsworth, C.I., Molloy, T.S., Gaikwad, V.V. and Dlugogorski, B.Z. (2013) Study on the reaction of CCl2F2 with CH4 in a dielectric barrier discharge nonequilibrium plasma. Plasma Processes and Polymers, 10 (10). pp. 912-921.
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The reaction of CCl2F2 (CFC-12) with methane (in an argon bath gas) in a dielectric barrier discharge (DBD) non-thermal plasma reactor at atmospheric pressure has been investigated. The reaction (where oxygen and nitrogen are excluded from the feed gas) produced a range of gas phase products, including H2, HCl, HF, CHF3, CF 3CH2F, CHClF2, CH3Cl, CH 2ClF, CH2Cl2, CHCl2F and CHCl 3 as well as solid products which were primarily non-crosslinked polymers. The conversion of CCl2F2 increased, from 44 to 71%, when the input energy density of the plasma was raised from 3 to 13 kJ · L-1 (applied voltage range is 13.4-14.8 kV, peak-peak). The relatively low input feed concentration of CCl2F2 and methane in the argon bath gas modifies the strong filamentary appearance of the pure argon discharge to a more diffuse appearance. The refrigerant CFC-12, harmful for atmospheric ozone layer and a major contributor to global warming, is treated with methane, in an argon bath gas and in the absence of oxygen and nitrogen using a dielectric barrier discharge nonequilibrium plasma reactor. Significant levels of CFC-12 conversion are achieved at temperatures below 100 °C and the process avoids producing toxic chemicals like CO and HCN. A simplified reaction mechanism is presented.
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