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Impact of individual flue gas component on mercury oxidation over V2O5-MoO3/TiO2 catalyst

Abstract

Titanium-vanadium-molybdenum (V2O5-MoO3/TiO2) SCR (Selective Catalytic Reduction) catalyst has been confirmed to be effective for mercury oxidation in 6% O2/N2 atmosphere, but the influence of the actual flue gas components on mercury oxidation over this catalyst had not been reported. Actually, the individual flue gas component could significantly influent the mercury oxidation ability of SCR catalyst. In this study, the effect of individual flue gas component on V2O5-MoO3/TiO2 for mercury oxidation was evaluated. It suggested that the mercury oxidation efficiency of V2O5-MoO3/TiO2 was over 95% with the presence of 20 ppm HCl. The process of mercury oxidization by HCl over V2O5-MoO3/TiO2 followed Langmuir-Hinshelwood mechanism. O2 was critical in this process, which could continue the catalytic recycle by re-oxidizing the reduced lattice oxygen. NH3 and H2O suppressed the mercury oxidation ability of the catalyst, especially H2O. The mercury oxidation ability of V2O5-MoO3/TiO2 was almost lost in the presence of 8% H2O. Even after the elimination of H2O, the mercury oxidation efficiency was only recovered to 55%. It was due to the competition of NH3 or H2O with Hg0 for the same active sites on the surface of the catalyst. Unfortunately, H2O caused irreversible damage to the active site. Additionally, the mercury oxidation efficiency was over 60% even with the existence of high SO2 content. It indicated that this catalyst displayed some degree of sulfur resistance.

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Publication details

The article was received on 07 Oct 2018, accepted on 09 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ05084H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Impact of individual flue gas component on mercury oxidation over V2O5-MoO3/TiO2 catalyst

    B. Zhao, J. Han, L. Qin, W. Chen, Z. Zhou and F. Xing, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05084H

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