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Physico-chemical effects of cerium oxide on catalytic activity of CeO 2 -TiO 2 prepared by sol-gel method for NH 3 -SCR

The effects of CeO2 on catalytic activity of CeO2-TiO2 for the selective catalytic reduction (SCR) of NOx were investigated in terms of structural, morphological, and physico-chemical analyseis. CeO2-TiO2 catalysts were synthesized with three different additions, 10, 20, and 30 wt% of CeO2, by the sol-gel method. The XRD peaks of all specimens were assigned to a TiO2 phase (anatase) and the peaks became broader with the addition of CeO2 because it was dispersed as an amorphous phase on the surface of TiO2 particles. The specific surface area of TiO2 increased with the addition of CeO2 from 60.6306 m 2 /g to 116.2791 m 2 /g due to suppression of TiO2 grain growth by CeO2. The 30 wt% CeO2-TiO2 catalyst, having the strongest catalytic acid sites (BrΦnsted and Lewis), showed the highest NOx conversion efficiency of 98 % at 300 o C among the specimens. It was considered that CeO2 contributes to the improvement of the NOx conversion of CeO2-