Nanometric CeO2-supported perovskite-liked La1.7Rb0.3CuO4 oxide catalysts with different loading amounts were obtained by the method of ultrasonic-assisted incipient-wetness impregnation. All of the catalysts were calcined at 700 degrees C for 6 h and characterized by means of BET, XRD, IR, and UV-vis-NIR. These materials were tested for the simultaneous removal of NOx and soot in the temperature range from 200 to 600 degrees C. As compared to nanometric CeO2 support particles (nmCeO(2)) or pure La1.7Rb0.3CuO4 perovskite-liked catalyst, the catalytic activities of all of the supported catalysts were remarkably enhanced. The temperatures for soot combustion of T-m decreased and the productivities of N-2 increased, and the activities of the catalysts increased with the perovskite-liked oxide loading amount. On the basis of in situ DRIFT characterization, NO oxidation, and O-2-TPD results, a reaction mechanism for the simultaneous removal of NOx and soot over (La1.7Rb0.3CuO4)(x)/nmCeO(2) was proposed.