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http://dx.doi.org/10.7464/ksct.2017.23.2.172

Simultaneous Removal of Mercury and NO by Metal Chloride-loaded V2O5-WO3/TiO2-based SCR catalysts  

Ham, Sung-Won (Department of Chemical Engineering, Kyungil University)
Publication Information
Clean Technology / v.23, no.2, 2017 , pp. 172-180 More about this Journal
Abstract
Thermodynamic evaluation indicates that nearly 100% conversion of elemental mercury to oxidized mercury can be attained by HCl of several tens of ppm level at the temperature window of SCR reaction. Cu-, Fe-, Mn-chloride loaded $V_2O_5-WO_3/TiO_2$ catalysts revealed good NO removal activity at the operating temperature window of SCR process. The catalysts with high desorption temperature indicating adsorption strength of $NH_3$ revealed higher NO removal activity. The HCl fed to the reaction gases promoted the oxidation of mercury. However, the activity for the oxidation of elemental mercury to oxidized mercury by HCl was suppressed by $NH_3$ inhibiting the adsorption of HCl to catalyst surface under SCR reaction condition containing $NH_3$ for NO removal. Metal chloride loaded $V_2O_5-WO_3/TiO_2$ catalysts showed much higher activity for mercury oxidation than $V_2O_5-WO_3/TiO_2$ catalyst without metal chloride under SCR reaction condition. This is primarily attributed to the participation of chloride in metal chloride on the catalyst surface promoting the oxidation of elemental mercury.
Keywords
Metal chloride-loaded SCR catalyst; $V_2O_5-WO_3/TiO_2$ catalyst; Mercury oxidation; NO removal by SCR; Hydrogen chloride;
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Times Cited By KSCI : 2  (Citation Analysis)
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