DEVELOPMENT OF A FLUOROCARBON DECOMPOSITION SYSTEM BY A FUNCTIONAL CERAMIC REACTOR WITH HIGH FREQUENCY SURFACE DISCHAGE

点击翻译按钮获取中文摘要

The aim of this research which was continued for three years is to establish the environmental air control system, that is, the decomposition system of diluted gaseous organic compounds in environmental air by using a alumina-based ceramic reactor with high frequency surface discharge on the inner wall of a cylindrical reactor. The non-equilibrium low temperature plasma prosuced by the surface discharge is found to be very effective to decompose many voltile compounds, such as CFC22 (chloro-difluorohydromethane : CHClF_2), CFC113 (trichlorotrifluoroethane : CF_2ClCFCl_2) and other halogenated organic compounds (trichloroethylene, 113-truchloroethane, 12-dichloroethane, dichloromethane). Inevery case, very high decomposition performance by the device was very well and more than 90% of dilute contaminants in air was removed. Other acetone in air was also decomposed by the surface discharge plasma as normal contaminated VOC.Acetone is found to be very difficult to be destroyed by the discharge. Alcohol (isopropylalcohol) is found to be oxidized by the discharge and some part is changed to acetone. By GCMS (Gas-Chromatograph Mass Spectrometer) analysis, the intermediate halogenated compounds and phosgen are observed when the decomposition is half (-50% decomposition rate). However, at the high decomposition rate of 95% or more, the intermediate products are decomposed and residual gasses are chlorohydrogen and carbon-dioxide. Production of NOx by the air discharge is not yet observed. UV is also found to be effective to decompose trichloroethylene.