WIDE WINDOW DENITRIFICATION OF V2O5/MICROPOROUS TiO2 UNDER SYNERGISTIC EFFECT OF DIELECTRIC BARRIER DISCHARGE PLASMA
The narrow active window is one of the key limitations for vanadium-titanium based catalysts in selective catalytic reduction of NOx with NH3 under dielectric barrier discharge.The V2O5/microporous TiO2 catalyst prepared by the hydrothermal method exhibited obvious wide NH3-SCR active window characteristics under the synergistic effect of dielectric barrier discharge.By comparing the catalytic performance of empty tubes,4V/TiO2,and the vanadium-titanium based catalyst with the microporous carrier at room temperature,as well as the reaction behavior of the catalyst in N2/O2,N2/O2/NH3,N2/O2/NO atmosphere,the catalytic reaction mechanism of the catalyst was analyzed.The sulfur and water resistance of the microporous-carrier catalyst was tested,and the microstructure of the material was analyzed by XRD,SEM,BET,XPS,TGA and FTIR.The results showed that the denitrification efficiency of the 4V/MP-TiO2 catalyst was increased by 33.68％compared to conventional vanadium-titanium catalysts,and it maintained a denitrification efficiency of more than 80％in the range of 243 J/L to 442 J/L.It has good sulfur and water resistance while reducing energy consumption.This is due to the loose overall structure of microporous TiO2,which has a rich pore structure,improving the pore volume of the carrier,as well as the dispersion of the catalyst,and more active adsorption sites for NH3,which is conducive to broadening the active window.At the same time,microporous TiO2 enhances the ability of the catalyst to oxidize NO,which facilitates the rapid SCR reaction when the specific input energy is high.
dielectric barrier dischargefast SCRvanadium-titanium based catalystmicroporedenitrification
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