Removal Of Pollutants From Cooking Fume By Coupling Electric Fields And Catalysts

The pollution caused by the cooking emission(particulate matters,aerosol,VOCs,etc.)has been paid more and more attention,because they are dangerous to human health and cause harm to the environment.Therefore,the control technology of cooking emission should be developed.Taking advantage of high-voltage electrostatic field is one of the best technology methods of particulate matters(PM)removal,and plasma technology is one of the most efficient ways of dissolving VOCs.However,both of the two methods have the disadvantage of producing ozone,the secondary pollutants.With the purpose of achieving the cooking fume removal with the coupling of high-voltage electrostatic fields and catalysts,this paper studied the effects on one-pass ozone removal with the coupling of different catalysts and carriers,and it chose manganese oxide octahedral molecular sieves(OMS-2)prepared in different ways to couple with plasma fields,so as to remove caproaldehyde,the representative of VOCs in cooking fume;and then it chose supported cobalt manganese compound metallic oxides,Co-MnOx/ZSM-5 loaded on the cordierite honeycomb ceramics to make the preliminary study of practical cooking fume pollution removal with the coupling with the high-voltage electrostatic fields.It was found from experiments that ozone removal onmanganese oxide octahedral molecular sieves and supported manganese cobalt composite metal-oxides could be acquired.The removal efficiency of ozone was dependent not only on the active constituents of catalysts,but also on the carriers and the ways of supporting.Under the same circumstances,OMS-2 worked better than Co-MnOx did,possible owing to relative larger specific surface area of OMS-2.After nickel foam net got the pre-oxidization,it could get a specific surface area of a different size,with relatively low influence on the supporting of fashioned powder catalysts.There was an obvious effect in the caproaldehyde removal with the coupling of catalysts and plasmas,and compared to individual plasma technology,this coupling could realize a high selectivity of CO2;gx-OMS-2 in solvent free method showed stronger activity in the experiment compared with the samples produced by hydrothermal method and reflux method,which was probably owing to the relatively larger specific surface area and stronger mobility of the oxygen species.The coupling of high-voltage electrostatic fields and Co-MnOx could enormously enhance the removal efficiency of cooking fume pollution.High-voltage electrostatic fields was more efficient for the removal of particulate matters with larger diameters,while for the PM1 removal,the result was less satisfactory;the removal efficiency of TVOCs in oil-smoke was greatly enhanced with the coupling of catalysts and high-voltage electrostatic fields.