Potassium Stability in Soot Combustion Perovskite Catalysts

The activity for soot combustion in NOx/O-2 and stability, under reaction conditions, of two potassium-perovskite catalysts (K/SrTiO3 and Sr0.8K0.2TiO3) and a potassium-copper perovskite catalyst (K-Cu/SrTiO3) has been studied. In fresh catalysts, potassium is more active than copper. However copper is stable under reaction conditions while potassium-catalysts are progressively deactivated due to the loss of this metal during consecutive TPR cycles.