Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava |
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Effect of Oxygen Content on VOC Abatement in DC-Driven DischargesMachala Z., Hensel K., Marode E. |
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Abstract: We investigate the effect of oxygen content in the carrier air on the VOC (toluene)abatement induced by DC-driven discharges in atmospheric pressure air and nitrogen. The dischargesused are a glow discharge and a transient spark, both generating non-thermal plasmas with gastemperatures of 1000-2000 K. The discharge properties, as well as the VOC abatement process aresensitive to the oxygen content. The removal efficiency related to the energy density increases withthe increasing oxygen content, leading to oxidation products such as COx, H2O and NOx. However,the VOC abatement is feasible at the reduced oxygen content, or even in nitrogen. In suchatmospheres, less oxidation products are formed, thus promoting the formation of unsaturatedhydrocarbons, and condensed products. Water vapours in the carrier gas optimize the process byslightly increasing the efficiency and significantly reducing the noxious outlet gases due to the effectof OH radicals.
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