| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4409259 | Chemosphere | 2013 | 8 Pages |
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 efficiency1 (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.
► Stable PCDD/Fs generating system is established and tested. ► The Destruction and Removal Efficiency (DRE) is composed of destruction proper. ► Adsorption on catalyst and reactor walls is considered. ► Oxidation is enhanced by higher temperature (220 °C) and addition of ozone (500 ppm). ► The characteristics of fresh and used catalyst are compared.
