Abstract
CeO 2 and CuO x -CeO 2 supported potassium catalysts were synthesized by wetness impregnation method. The catalysts were characterized by BET, NO-TPO, NO x -TPD and soot-TPO measurements. By the decoration of potassium and copper, the maximum soot combustion temperature of the ceria-based catalyst decreased to 338 and 379 °C in the presence and absence of NO under a loose contact mode, respectively. The pronouncedly enhanced NO oxidation ability by copper introduction and NO x storage capacity by potassium modification were especially important in the NO x -assisted soot oxidation reaction with the K/CuCe catalyst.
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