Study on the Reaction of CCl₂F₂with CH₄in a Dielectric Barrier Discharge Nonequilibrium Plasma

Abstract

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, CF3CH2F, CHClF2, CH3Cl, CH2ClF, CH2Cl2, CHCl2F and CHCl3 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.

Characterization of Polymer Synthesized from the Nonequilibrium Plasma Conversion of CFC-12 and Methane in a Dielectric Barrier Discharge Reactor

“…The mechanism in the formation of gaseous species has been described in detail in our earlier publication. 14 In this article, mechanistic discussions in the formation of various radicals in the plasma reactor as well as their reaction in the synthesis of polymers are presented.…”

“…The detailed procedure for calculating power input to the reactor can be found in our earlier publication, 16 with a slight modification as described in a later publication. 14 The feed gases were argon (99.999%, Coregas), CFC-12 (99.98%, Actrol), and methane (99.95%, Linde), and the feed streams were controlled by mass flow controllers (Brooks). The results presented in this article were generated with a feed condition of 1.25% CCl 2 F 2 and 1.25% CH 4 in argon at 100 cm 3 min −1 .…”

Experimental Study on the Reaction of CCl3F and CH4 in a Dielectric Barrier Discharge Nonequilibrium Plasma Reactor

“…A detailed description of our procedure for calculating power input to the reactor can be found in our earlier publication. 29 The input power can then be converted to estimate the input energy density (input energy density = P/F, where P is the average power dissipated by the reactor and F is the total volumetric feed rate). The input energy density range for this investigation was 3−13 kJ L −1 and the corresponding applied voltage range was 14.1−15.2 kV (peak−peak).…”

“…The power input to the plasma reactor was determined by the enclosed area of a voltage-charge Lissajous figure. A detailed description of our procedure for calculating power input to the reactor can be found in our earlier publication . The input power can then be converted to estimate the input energy density (input energy density = P / F , where P is the average power dissipated by the reactor and F is the total volumetric feed rate).…”

A Novel Wastewater Treatment Method Using Electrical Pulsed Discharge Plasma over a Water Surface

“…The Cl-H bonding energy of CH 2 Cl 2 is 4.28 eV and is lower than the energy of metastable Ar (11.55 eV) produced by electron impact, as shown in reaction ( 9) [99]. Therefore, CH 2 Cl 2 is also possibly decomposed by Penning ionization by the energy transfer collision of metastable Ar (Ar*) as shown in the following reactions: [99,100].…”