Sol-gel preparation of mesoporous cerium-doped FeTi nanocatalysts and its SCR activity of NOx with NH3 at low temperature

A series of cerium-doped mesoporous FeTi nanocatalysts were synthesized through a sol-gel method, and their performances for the selective catalytic reduction (SCR) of NOx with NH3 were explored. The mesoporous Ce(0.2) FeTi catalyst exhibited excellent low-temperature catalytic activity and high resistance to sulfur poisoning. A NOx conversion higher than 95 % was achieved at 200 A degrees C over the Ce(0.2) FeTi catalyst. The strong interactions between cerium, iron oxides and titania in the Ce(0.2) FeTi catalyst resulted in a large amount of Ce3+, more active chemisorbed oxygen and more Bronsted acid sites, which contributed to the high catalytic activity for the SCR of NOx in the low-temperature region. The enhanced BET surface area and pore volume of its mesoporous structure also played an important role in its catalytic performance. Based on the DRIFTS analysis, an Eley-Rideal mechanism was proposed for the SCR over the Ce(0.2) FeTi mesoporous catalyst.