The performance of V2O5/TiO2-based commercial SCR catalyst for the oxidation of gaseous elemental mercury (Hg°) with respect to reaction conditions was examined to understand the mechanism of Hg° oxidation on SCR catalyst. It was observed that a much larger amount of Hg° adsorbed on the catalyst surface under oxidation condition than under SCR condition. The activity of commercial SCR catalyst for Hg° oxidation was negligible in the absence of HCl, regardless of reaction conditions. The presence of HCl in the reactant gases greatly increased the activity_x000D_ of SCR catalyst for the oxidation of Hg° to oxidized mercury (Hg2+) such as HgCl2 under oxidation condition. However, the effect of HCl on the oxidation of Hg° was much less under SCR condition than oxidation condition. The activity for Hg° oxidation increased with the decrease of NH3/NO ratio under SCR condition. This might be attributed to the strong adsorption of NH3 prohibiting the adsorption of HCl which was vital species promoting the oxidation of Hg° on the catalyst surface under SCR condition.

Mercury Oxidation Selective Catalytic Reduction Hydrogen Chloride Elemental and Oxidized Mercury

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