Enhanced activity and sulfur resistance for soot combustion on three-dimensionally ordered macroporous-mesoporous MnxCe1-xOδ/SiO2 catalysts

•MnxCe1-xOδ/3DOM-m SiO2 catalysts were purposefully designed and successfully prepared by simple method.•The as-prepared catalysts exhibit high catalytic activity and good stability for soot combustion.•Macropore, mesopore and synergistic effect between Mn and Ce are benefit for soot combustion.•The synergistic effect between Mn and Ce is in favor of maintaining catalytic activity under atmosphere of SO2 and H2O.