Abstract: | Three‐dimensionally ordered macroporous (3DOM) CuxCe‐M (x denote the mole ratio of Cu/Ce + Cu]) oxide catalysts with large pore sizes and interconnected macroporous frameworks were successfully synthesized using a polymethyl methacrylate template method. The 3DOM structure improves the contact efficiency between catalyst and soot, which benefits soot elimination in the low temperature range. The low redox barriers of the 3DOM Cu–Ce solid solution also facilitate the elimination of the soot. The 3DOM Cu0.1Ce catalysts exhibit the highest catalytic activity with maximum soot oxidation rate temperatures at 375 and 351 °C in the air and NO x atmosphere, respectively. The NO x‐TPD results demonstrate that the NO2 produced in the Ce0.1Cu‐M sample plays a curial role in improving the soot oxidation performance. Meanwhile, the NO‐DRIFTs reveal that the nitrates stored in the Cu0.1Ce‐M sample also had a promotional effect on the soot elimination. |