High-temperature stability of V2O5/TiO2-WO3-SiO2 SCR catalysts modified with rare-earths

Abstract The introduction of rare earth elements (RE = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er and Yb) into a V 2 O 5 /TiO 2 -WO 3 -SiO 2 system leads to a catalyst which shows a significant improvement in thermal stability by hindering transformation of TiO 2 (anatase) into TiO 2 (rutile). As a consequence, these novel compounds show high removal efficiencies for NO x even after aging at 1023 K, when the state of the art SCR catalysts loose activity and selectivity. This allows potential application of these catalysts in the removal of NO x from diesel or lean-burn automotive engines in addition to stationary applications at high temperatures.