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http://dx.doi.org/10.14478/ace.2017.1083

Thermal Deactivation of Plate-type V2O5-WO3/TiO2 SCR Catalyst  

Cha, Jin-Sun (Material Technology Center, Korea Testing Laboratory)
Park, Jin-Woo (Nano Co., Ltd.)
Jeong, Bora (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology)
Kim, Hong-Dae (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology)
Park, Sam-Sik (Nano Co., Ltd.)
Shin, Min-Chul (Material Technology Center, Korea Testing Laboratory)
Publication Information
Applied Chemistry for Engineering / v.28, no.5, 2017 , pp. 576-580 More about this Journal
Abstract
In the present paper, the thermal deactivation characteristics of plate-type commercial $V_2O_5-WO_3/TiO_2$ SCR catalyst were investigated. For this purpose, the plate-type catalyst was calcined at different temperatures ranging from $500^{\circ}C$ to $800^{\circ}C$ for 3 hours. Structural and morphological changes were characterized byXRD, specific surface area, porosity, SEM-EDS and also NOx conversion with ammonia according to the calcine temperature. The NOx conversion decreased with increasing calcine temperature, especially when the catalysts were calcined at temperatures above $700^{\circ}C$. This is because the crystal phase of $TiO_2$ changed from anatase to rutile, and the $TiO_2$ grain growth and $CaWO_4$ crystal phase were formed, which reduced the specific surface area and pore volume. In addition, $V_2O_5$, which is a catalytically active material, was sublimated or vaporized over $700^{\circ}C$, and a metal mesh used as a support of the catalyst occurred intergranular corrosion and oxidation due to the formation of Cr carbide.
Keywords
deNOx; SCR; $V_2O_5-WO_3/TiO_2$; plate type catalyst; thermal deactivation;
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