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Preparation of $WO_3/TiO_2$ and $V_2O_5/TiO_2$ powders and their catalytic performances in the SCR of $NO_x$  

Lee, Tae-Suk (Department of Materials Engineering, Korea Maritime University)
Lee, In-Gyu (Department of Materials Engineering, Korea Maritime University)
Lee, Byeong-Woo (Department of Materials Engineering, Korea Maritime University)
Shin, Dong-Woo (School of Nano and Advanced Materials Engineering, Gyeongsang National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.16, no.5, 2006 , pp. 216-221 More about this Journal
Abstract
An investigation of the influence of $WO_3$ and $V_2O_5$ catalysts on the microstructure, phase formation and selective catalytic reduction (SCR) efficiency of the synthesized SCR powders has been carried out. A commercial anatase-$TiO_2$ was used as the catalysts support. For $WO_3(10wt%)/TiO_2$, the W loading to the $TiO_2$ support led to the lower in anatase to rutile transition temperature from $1200^{\circ}C$ of $TiO_2$ support to ${\sim}900^{\circ}C$. The transition temperature was also lowered to below $650^{\circ}C$ in the $V_2O_5$(5 and 10 wt%) added composition. The $WO_3(10wt%)/TiO_2$ SCR powder obtained at $450^{\circ}C$ showed near 100% of $NO_x$ conversion efficiency at $350{\sim}400^{\circ}C$ and for the powder prepared at $650^{\circ}C$ the same efficiency was achieved in wider temperature range $300{\sim}400^{\circ}C$. The highest $NO_x$ conversion efficiency of 100% was obtained in the $V_2O_5(5wt%)/TiO_2$ SCR composition calcined at $650^{\circ}C$ in the relatively wider temperature range $250{\sim}350^{\circ}C$, while the catalytic efficiency considerably decreased for the $V_2O_5(10wt%)/TiO_2$. The lowered conversion efficiency of $NO_x$ observed in the $V_2O_5(10wt%)/TiO_2$ composition calcined at $650^{\circ}C$ was considered to be correlated with the lowered surface area resulting from the increased crystallite growth by highly reactive vanadium loading.
Keywords
Selective catalytic reduction(SCR); $WO_3/TiO_2$; $V_2O_5/TiO_2$; $NO_x$ conversion; anatase $TiO_2$;
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