Abstract
Vanadium oxide-based catalysts were developed for the destruction of vapour phase PCDD/Fs (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans). A vapour phase PCDD/Fs generating system was designed to supply stable PCDD/Fs steam with initial concentration of 3.2 ng I-TEQ Nm−3. Two kinds of titania (nano-TiO2 and conventional TiO2) and alumina were used as catalyst supports. For vanadium-based catalysts supported on nano-TiO2, catalyst activity is enhanced with operating temperature increasing from 160 to 300 °C and then reduces with temperature rising further to 350 °C. It is mainly due to the fact that high volatility of organic compounds at 350 °C suppresses adsorption of PCDD/Fs on catalysts surface and then further inhibits the reaction between catalyst and PCDD/Fs. The optimum loading of vanadium on nano-TiO2 support is 5 wt.% where vanadium oxide presents highly dispersed amorphous state according to the Raman spectra and XRD patterns. Excessive vanadium will block the pore space and form microcrystalline V2O5 on the support surface. At the vanadium loading of 5 wt.%, nano-TiO2-supported catalyst performs best on PCDD/Fs destruction compared to Al2O3 and conventional TiO2. Chemical states of vanadium in the fresh, used and reoxidized VOx(5 %)/TiO2 catalysts at different operating temperature are also analysed by XPS.
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This work is supported by the National Basic Research Development Program of China (973 Program No. 2011CB201500), National High Technology Research and Development Key Program of China (No. 2012AA062803), Public Technology Application Research project of Zhejiang Province (No. 2015C31009), Research Fund for International Young Scientists by NSFC (No. 51550110228) and National Natural Science Foundation of China (No. 51406182).
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Responsible editor: Santiago V. Luis
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Yu, Mf., Lin, Xq., Li, Xd. et al. Catalytic destruction of PCDD/Fs over vanadium oxide-based catalysts. Environ Sci Pollut Res 23, 16249–16258 (2016). https://doi.org/10.1007/s11356-016-6807-x
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DOI: https://doi.org/10.1007/s11356-016-6807-x