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Vanadia/titania catalysts were prepared containing 6.0 or 8.0 wt% V 2 O 5  via the impregnation method. The samples as prepared were calcined at 400°C or 600°C, respectively. Selective catalytic reduction (SCR) of NO with NH 3  was carried out at 257°C over the prepared catalysts. NO conversion as a function of time was followed and the stationary conversion versus the amount of catalyst employed was also investigated.    It was found that the vanadia/titania catalysts calcined at 400°C were more active in the SCR of NO with NH 3  relative to those calcined at 600°C. This was attributed to such catalysts possessing complete monolayer coverage of vanadia on the titania substrate. It was established that V 5+  was not the active vanadia species but V 4+  and V 3+  may act as such for the SCR of NO with NH 3 .

Physicochemical and Catalytic Properties of Vanadia/Titania Catalysts. V. Selective Catalytic Reduction of NO with NH3

Physicochemical and Catalytic Properties of Vanadia/Titania Catalysts. V. Selective Catalytic Reduction of NO with NH₃