The effect of the calcination temperature on the structure and the catalytic performance of a CeMoOxmixed oxide catalyst in the selective catalytic reduction (SCR) of NOx with NH3has been investigated.Compared to the catalyst calcined at 400◦C, the one calcined at 500◦C shows a performance of a slightlylower NOx conversion in the reaction temperature range below 200◦C, and a higher NOx conversionabove 350◦C. However, further increase of the calcination temperature to 600 and 700◦C leads to a dropof the NOx conversion and the N2selectivity in both the low and high reaction temperature ranges. Forthe samples calcined at 600 and 700◦C, Mo significantly enriches on the surface. These samples alsofavor the formation of N2O, and show a poor redox ability in NO oxidation reaction. The low ratio and lowmobility of the surface chemisorbed oxygen correlates to the poor redox ability of the samples calcinedat high temperatures. Furthermore, an abrupt drop of the surface area for the sample calcined at 600◦Cis observed and the destruction of acid sites during the high temperature calcination also recorded
Effect of the calcination temperature on the performance of a CeMoOxcatalyst in the selective catalytic reduction of NOx with ammoniaJihui