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http://dx.doi.org/10.14478/ace.2020.1069

The Effect of Alkali Metal Ions (Na, K) on NH3-SCR Response of V/W/TiO2  

Yeo, Jonghyeon (Department of Environmental Energy Engineering, Graduate school of Kyonggi University)
Hong, Sungchang (Department of Environmental Energy Engineering, Kyonggi University)
Publication Information
Applied Chemistry for Engineering / v.31, no.5, 2020 , pp. 560-567 More about this Journal
Abstract
In this study, we investigated that the effect of alkali metals [Na(Sodium) and K(Potassium)], known as representative deactivating substances among exhaust gases of various industrial processes, on the NH3-SCR (selective catalytic reduction) reaction of V/W/TiO2 catalysts. NO, NH3-TPD (temperature programmed desorption), DRIFT (diffuse reflectance infrared fourier transform spectroscopy analysis), and H2-TPR analysis were performed to determine the cause of the decrease in activity. As a result, each alkali metal acts as a catalyst poisoning, reducing the amount of NH3 adsorption, and Na and K reduce the SCR reaction by reducing the L and B acid points that contribute to the reaction activity of the catalyst. Through the H2-TPR analysis, the alkali metal is considered to be the cause of the decrease in activity because the reduction temperature rises to a high temperature by affecting the reduction temperature of V-O-V (bridge oxygen bond) and V=O (terminal bond).
Keywords
$NH_3-SCR$; Catalyst; Alkali; Vanadium; Poisoning;
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