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A series of well-reported Cex–Ti catalysts with a low content of Ce species were synthesized by a sol–gel method. The aim of this study was to investigate the influence of different calcination atmospheres on the formation of the Ce–O–Ti structure that comprises active sites for the selective catalytic reduction (SCR) of NO by NH3. Catalytic activity tests showed that the Cex–Ti–N (calcined under a nitrogen atmosphere) catalysts exhibited a significantly higher NO removal efficiency than Cex–Ti–A (calcined under air). Characterization results confirmed that more Ce species could incorporate into the TiO2 lattice when calcined under a nitrogen atmosphere, thus, more Ce–O–Ti structures were obtained over the Cex–Ti–N surface. This improved the NH3 adsorption and electron transfer from Ti to Ce. Therefore, N2 calcination increased the acid sites and improved the redox ability for Cex–Ti–N catalysts. In addition, it was found that the redox ability was the critical factor, which effectively promoted the low temperature SCR performance. Amongst the Cex–Ti–N catalysts, Ce5–Ti–N revealed the best SCR activity, catalytic stability and resistance to H2O and SO2. This study demonstrated the feasibility of N2 calcination in the syntheses of doped SCR catalysts and also explored the SCR reaction mechanism over the well-reported Cex–Ti catalysts. We expect that this study could shed some light on the development of feasible preparative routes for the syntheses of Metal-Ti catalysts for SCR application.

rsc advances

The effects of calcination atmosphere on the catalytic performance of Ce-doped TiO<sub>2</sub> catalysts for selective catalytic reduction of NO with NH<sub>3</sub>

The effects of calcination atmosphere on the catalytic performance of Ce-doped TiO2 catalysts for selective catalytic reduction of NO with NH3

The effects of calcination atmosphere on the catalytic performance of Ce-doped TiO₂ catalysts for selective catalytic reduction of NO with NH₃