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http://dx.doi.org/10.7464/ksct.2011.17.4.370

Activity of $V_2O_5-WO_3/TiO_2$-based SCR Catalyst for the Oxidation of Gas-phase Elemental Mercury  

Hong, Hyun-Jo (Department of Chemical Engineering, Kyungil University)
Ham, Sung-Won (Department of Chemical Engineering, Kyungil University)
Publication Information
Clean Technology / v.17, no.4, 2011 , pp. 370-378 More about this Journal
Abstract
Catalytic activity of $V_2O_5-WO_3/TiO_2$-based SCR catalyst was examined for the oxidation of gas-phase elemental mercury to oxidized mercury. Mercury species was not detected on the commercial SCR catalyst after the oxidation reaction of elemental mercury, regadless of the presence of HCl acting as oxidant and the reaction conditions. This suggests that elemental mercury oxidation by HCl could occur via a Eley-Rideal mechanism with gas phase or weakly-bound mercury on the surface of $V_2O_5-WO_3/TiO_2$ SCR catalyst. The activity for mercury oxidation was significantly increased with the increase of $V_2O_5$ loading, which indicates that $V_2O_5$ is the active site. However, turnover frequency for mercury oxidation was decreased with the increase of $V_2O_5$ loading, indicating the activity for mercury oxidation was strongly dependent on the surface structure of vanadia species. The activity for oxidation of elemental mercury under SCR condition was much less than that under oxidation condition at the same HCl concentration and reaction temperature.
Keywords
SCR catalyst; Mercury oxidation; Eley-Rideal mechanism; Turnover frequency;
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