| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4407712 | Chemosphere | 2016 | 9 Pages |
•Various transition metal oxide catalysts are developed for PCDD/Fs destruction.•Multi-metallic VOx/TiO2 catalysts are also investigated to destroy PCDD/Fs.•A PCDD/Fs generating system is installed to supply PCDD/Fs steam with stable concentration.•Chemical states of various metals in the fresh and used catalysts are discussed.
Various transition metal oxide and vanadium-containing multi-metallic oxide catalysts were developed for the destruction of PCDD/Fs (polychlorinated dibenzo-p-dioxins and furans). A stable PCDD/Fs generating system was installed to support the catalytic destruction tests in this study. Nano-titania supported vanadium catalyst (VOx/TiO2) showed the highest activity, followed by CeOx, MnOx, WOx and finally MoOx. Multi-metallic oxide catalysts, prepared by doping WOx, MoOx, MnOx and CeOx into VOx/TiO2 catalysts, showed different activities on the decomposition of PCDD/Fs. The highest destruction efficiency of 92.5% was observed from the destruction test over VOxCeOx/TiO2 catalyst. However, the addition of WOx and MoOx even played a negative role in multi-metallic VOx/TiO2 catalysts. Characterizations of transition metal oxides and multi-metallic VOx/TiO2 catalysts were also investigated with XRD and TPR. After the catalysts were used, the conversion from high valent metals to low valence states was observed by XPS.
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