Improving the accessible reaction sites of catalysts is vital to diesel soot elimination. Herein, hierarchical brushlike alpha-MnO, and Co3O4 nanoarrays were in situ grown on AISI304 stainless steel wire-mesh via a two-step hydrothermal method. Morphology investigation displayed that compared with sole alpha-MnO2 or Co3O4 nanoarrays, alpha-MnO2 and Co3O4 nanoarrays provided 8-fold reaction sites. XRD, Raman spectroscopy, XPS, H-2-TPR, and soot-TPR techniques proved the synergistic effect between cobalt and manganese, namely, weaker Mn-O bonds, more surface active oxygen species, and better redox ability. Kinetic data also showed that the activation energy was decreased, and the pre-exponential factor was increased. alpha-MnO2 and Co3O4 nanoarrays displayed superior catalytic performance (T-50 = 354 degrees C, T-90 = 395 degrees C), durability, and isothermal regeneration activity. In a simulated diesel exhaust at 400 degrees C, 90% of soot would be eliminated at 12 min, and the regeneration would be finished within 30 min. Finally, the catalyst coating was tightly anchored on the substrate without exfoliation or crazing.