The effect of the calcination temperature on the structure and the catalytic performance of a CeMoOx mixed oxide catalyst in the selective catalytic reduction (SCR) of NOx with NH3 has been investigated. Compared to the catalyst calcined at 400 degrees C, the one calcined at 500 degrees C shows a performance of a slightly lower NOx conversion in the reaction temperature range below 200 degrees C, and a higher NOx conversion above 350 degrees C. However, further increase of the calcination temperature to 600 and 700 degrees C leads to a drop of the NOx conversion and the N-2 selectivity in both the low and high reaction temperature ranges. For the samples calcined at 600 and 700 degrees C, Mo significantly enriches on the surface. These samples also favor the formation of N2O, and show a poor redox ability in NO oxidation reaction. The low ratio and low mobility of the surface chemisorbed oxygen correlates to the poor redox ability of the samples calcined at high temperatures. Furthermore, an abrupt drop of the surface area for the sample calcined at 600 degrees C is observed and the destruction of acid sites during the high temperature calcination also recorded. (C) 2014 Elsevier B.V. All rights reserved.