将四氯乙烯,间二甲苯气态混合物同时引入无声放电反应器,加工频正弦交流高压对混合污染物进行放电分解实验.结果发现:与单一组分污染物的降解特性相比,混合气体中四氯乙烯的降解率变化较大,最大降解率由单独处理时的76%下降到27%,而间二甲苯的降解率基本保持不变,最大降解率可达90%左右;相同条件下,不锈钢棒高压电极对污染物的降解效果要略好于螺纹钢棒电极;3种电极间距对混合气体的降解效果依次为5 mm>7.5 mm>10 mm.
Removal of single component and binary mixtures of benzene and m-xylene usinga multi-pin-mesh reactor was studied to find the decomposition characteristics,carbon balanceand CO_2 selectivity.The decomposition rate of benzene in mixture was approximately 16% lowerthan that of single component benzene.However,the decomposition rate of m-xylene in mixturewas slightly higher than that of single component m-xylene.Carbon balance of the mixturedecomposition process achieved a lower level than that of single component benzene/m-xylene.Increase in the specific input energy was helpful to improve CO_2 selectivity in the single componentdecomposition process,while the specific input energy had a negligible effect on CO_2 selectivity inthe mixture decomposition process.By changing the oxygen content in background gas,we foundthat different types of radicals showed different reaction activities toward benzene and m-xylene.Benzene was more likely to react with nitrogen-containing radicals,while m-xylene was more likelyto react with oxygen-containing radicals.
In this study,the improvement in the removal of chlorobenzene (C_6H_5Cl) in the airwas investigated by combining dielectric barrier discharge (DBD) driven by bipolar pulse-powerwith catalysts.Molecular sieve 4A (MS-4A) and MnO_2/γ-Al_2O_3 (MnO_2/ALP) an two kinds ofcatalysts were tested at different positions in a DBD reactor.Catalysts were located either in thedischarging area between two electrodes,or just behind the discharging area (in the afterglow area)cloned to the outlet.The results indicated that DBD reactor with a bipolar pulse power-supplyproduced strong instant discharge and energetic particles,which can effectively activate catalystsof MS-4A and MnO_2/ALP located in the afterglow area to achieve the synergistic effects oneffective fission of chemical bonds of chlorobenzene.It wan considered that the gas-chlorobenzeneand the chlorobenzene adsorbed on the catalysts were decomposed simultaneously.
