De-NOx Characteristics of V2O5 SCR according to the Ratio of TiO2 Crystal Structures

Title & Authors
De-NOx Characteristics of V2O5 SCR according to the Ratio of TiO2 Crystal Structures
Seo, Choong-Kil; Bae, Jaeyoung;

Abstract
The purpose of this study is to investigate the de-NOx performance characteristics according to the $\small{TiO_2}$ crystal structures ratio of $\small{V_2O_5}$ SCR catalysts. The anatase(100%) SCR catalyst showed the highest desorption peak of 80ppm at about $\small{250^{\circ}C}$, and $\small{NH_3}$ was not desorbed at $\small{500^{\circ}C}$. It can be confirmed that there was many $\small{NH_3}$ desorbed at a high temperature among other various crystal structures, which is because the catalyst was more acidized to increase the intensity of acid sites as the content of subacid sulfate ions($\small{NH_2SO_4}$) in the rutile phase increases. The anatase/rutile(7%/93%) SCR had the smallest width of de-NOx performance drop according to thermal aging, and had strong durability against thermal aging.
Keywords
Diesel engine;Catalyst;SCR;$\small{TiO_2}$;Structure;
Language
English
Cited by
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