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Decomposition of tetrachloromethane by pulsed dielectric-barrier discharge

Krawczyk K., Karpiński L., Magierska A.

Polish Journal of Applied Chemistry

2005

Vol. 49, nr 1-2

167-175

Non-thermal plasma of pulsed dielectric-barrier discharge (PDBD) was used for the decomposition of tetrachloromethane. The study was carried out using air or oxygen as carrier gas. The effect of the initial concentration of CCl4, flow rate of gas mixture and presence of the packing in the discharge gap on conversion rate of CCl4 was studied. The pulsed dielectric-barrier discharge combined with the packing of TiO2, Pt/SiO2 or SiO2 (quartz glass) has been applied for tetrachloromethane conversion. It has been concluded that the granular packing in the discharge gap increases the conversion rate of tetrachloromethane.

Plasma-catalytic processing for environmental protection

Krawczyk K.

Polish Journal of Chemical Technology

2002

Vol. 4, nr 2

17-20

Plasma-catalytic processing may be an efficient way for the decomposition of tetrachloromethane and nitrous oxide. The silent and the gliding discharges combined with a catalytic bed have been applied. The gliding arc discharge combined with TiO" SiO2 (ąuartz glass), and y-Al,O, beds packing has been used for nitrous oxide processing in oxygen. The silent discharge stabilized dielectric barrier combined with TiO, bed packing has been applied for tetrachloromethane conversion to chlorine in argon and oxygen. The conversion ratę of nitrous oxide, as well as the coiwersion ratę of nitrous oxide to NO, was studied as a funetion of specific energy. The conversion ratę of nitrous oxide to elements and NO and the conversion ratę of nitrous oxide to NO increased when granular dielectric materials TiO,, SiO, (ąuartz glass), and y-Al,O3 were introduced into the discharge space. The effect of interelectrode space filling with granulated TiO2 on conversion ratę of CC14 to chlorine in silent discharge was observed.

Decomposition of tetrachloromethane and nitrous oxide under low-temperature plasma condition

Krawczyk K., Ruszniak J., Młotek M., Czernichowski A., Schmidt-Szałowski K.

Polish Journal of Applied Chemistry

1998

Vol. 42, nr 2

151-157

Two methods for decomposition of stable gaseous compounds were studied:1) by means of silent electric discharge stabilized with a dielectric barrier and 2) by gliding electrical discharge (Glid-Arc). Both the silent and the gliding discharges may be used under atmospheric pressure. The advantage of these methods is their low energy consumption and high yield of free radicals. They can be used for decomposition of stable toxical gases or liquids like chlorinated organic compounds, NOX etc. The effect of the both kinds of discharge on transformation of tetrachloromethane and of nitrous oxide was examined.