Abstract
MnO x -TiO 2, CeO 2-MnO x -TiO 2 and V 2O 5-MnO x -TiO 2 catalysts for low-temperature NH 3-SCR were prepared by sol-gel method. The results showed that both cerium and vanadium prevented the transformation of anatase TiO 2 to the rutile phase. The addition of vanadium oxide induced the segregation of crystalline Mn 2O 3, which contributed little to low-temperature SCR and ammonia oxidation, from the MnO x -TiO 2 solid solutions. However, the selectivity of the V-containing catalyst was almost 100% due to the decreased ammonia consumption and enhanced adsorption capacity of ammonia on Brønsted acid sites at relatively high temperatures. The electron-donating effect of cerium reduced the Mn 4+/Mn 3+ ratio to some extent, resulting in a decreased activity for ammonia oxidation. This, in combination with the enhanced ammonia adsorption capacity by Ce n+ as additional Lewis acid sites, endowed the Ce-doped catalyst a higher N 2 selectivity than MnO x -TiO 2 despite the slightly elevated light-off temperature for NO conversion.
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