Enhanced
Activity of Ti-Modified V<sub>2</sub>O<sub>5</sub>/CeO<sub>2</sub> Catalyst for the Selective Catalytic Reduction
of NO<sub><i>x</i></sub> with NH<sub>3</sub>
- Publication date
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Abstract
A novel V<sub>2</sub>O<sub>5</sub>/CeTiO<sub><i>x</i></sub> catalyst showed excellent catalytic
performance in the selective
catalytic reduction (SCR) of NO<sub><i>x</i></sub> with
NH<sub>3</sub>. The addition of Ti into V<sub>2</sub>O<sub>5</sub>/CeO<sub>2</sub> enhanced catalytic activity, N<sub>2</sub> selectivity,
and resistance against SO<sub>2</sub> and H<sub>2</sub>O. These catalysts
were also characterized by N<sub>2</sub> adsorption, XRD, XPS, and
H<sub>2</sub>-TPR. The lower crystallinity, more reduced species,
better dispersion of surface vanadium species, and more acid sites
due to the modification of V<sub>2</sub>O<sub>5</sub>/CeO<sub>2</sub> with TiO<sub>2</sub> all improved the NH<sub>3</sub>–SCR
activity significantly. Based on <i>in situ</i> DRIFTS,
it was concluded that the NH<sub>3</sub>–SCR reaction over
V<sub>2</sub>O<sub>5</sub>/CeTiO<sub><i>x</i></sub> and
V<sub>2</sub>O<sub>5</sub>/CeO<sub>2</sub> mainly followed the Eley–Rideal
mechanism
