Three-dimensionally ordered macroporous (3DOM) spinel-type MCr2O4 (M = Co, Ni, Zn, Mn) catalysts were successfully prepared by colloidal crystal template strategy and characterized by means of XRD, FE-SEM, BET, FT-IR, H2-TPR and O2-TPD. The 3DOM catalysts exhibited superior activity compared to their corresponding bulk counterparts, which were used as reference benchmarks in this study, owning to the enlarged contact between catalyst and soot particle and improved mass transfer caused by the unique well-defined 3DOM structures. Meanwhile, the influencing factors of catalytic activity for 3DOM catalysts on soot combustion were also optimized such as metallic cations and feed compositions. Furthermore, the 3DOM catalysts displayed strong durability due to the robust 3DOM structure against the structural collapse, demonstrating their promising potential in view of practical working conditions of diesel engines.

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