Abstract
The purpose of this study is to investigate the de-NOx performance characteristics according to the TiO₂ crystal structures ratio of V₂O 5 SCR catalysts. The anatase(100%) SCR catalyst showed the highest desorption peak of 80ppm at about 250℃, and NH₃ was not desorbed at 500℃. It can be confirmed that there was many NH₃ 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(NH₂SO₄) 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.
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