title: Ozone-enhanced oxidation of PCDD/Fs over V(2)O(5)-TiO(2)-based catalyst.
abstract: The catalytic oxidation of PCDD/Fs (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans) vapors was studied in a temperature range of 180-220°C on a honeycomb V2O5-TiO2-based catalyst, in the presence and the absence of ozone. A stable dioxin-generating system was established to support the experimental program and this system could adjust the concentration of PCDD/Fs by injecting appropriate mother liquors. At 220°C the removal efficiency(1) (RE) of PCDD/Fs reaches up to 97% and the degradation efficiency (DE) up to 90%. Both values diminish at lower operating temperatures. In the presence of ozone, however, these values rise to 99% and 98% at 220°C. Especially at low temperatures the effect of ozone is obvious. Catalytic oxidation with ozone thus offers a low-temperature solution to achieve higher rates and low activation energies. The morphology and microstructure of the catalysts changes after ozone treatment and some of their characteristics seem closely related with DE-values.
authors.affiliation: State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China. 11027050@zju.edu.cn
authors.forename: Sha-Sha
authors.initials: SS
authors.lastname: Ji
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Ren
authors.forename: Tong
authors.initials: T
authors.lastname: Chen
authors.forename: Ke-Fa
authors.initials: KF
authors.lastname: Cen
authors.forename: Ming-Jiang
authors.initials: MJ
authors.lastname: Ni
authors.forename: Alfons
authors.initials: A
authors.lastname: Buekens
mesh_terms: D001572:Benzofurans / Q000737:chemistry*; D002384:Catalysis; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D000072317:Polychlorinated Dibenzodioxins; D017968:Vanadium Compounds; C009495:titanium dioxide; D010126:Ozone; C066075:vanadium pentoxide; D014025:Titanium