Activity and characterization of Ce–Mo–Ti mixed oxide catalysts prepared by a homogeneous precipitation method for selective catalytic reduction of NO with NH 3

A series of Ce–Mo–Ti mixed oxide catalysts prepared by a homogeneous precipitation method were evaluated for selective catalytic reduction (SCR) of NO with NH3. These catalysts were characterized by BET, XRD, XPS, SEM, TEM and H2-TPR. The experimental results indicated that the optimal Ce–Mo–Ti mixed oxide catalyst (Ce40Mo10Ti) exhibited excellent SCR activity in a wide temperature range of 250–450°C as well as strong resistance to high gas hourly space velocity, 10% H2O or/and 1000 ppm SO2. The introduction of Mo could enhance redox property and increase the amount of Ce3+, accompanied by the increment of oxygen vacancies and adsorbed oxygen species on the catalyst surface, which were advantageous to the SCR reaction over Ce–Mo–Ti oxide catalyst. In addition, good dispersion of Ce and Mo species on TiO2 and their synergetic interaction also contributed to its remarkable NH3–SCR performance.