Interface interaction induced oxygen activation of cactus-like Co3O4/OMS-2 nanorod catalysts in situ grown on monolithic cordierite for diesel soot combustion

Herein, Co3O4 decorated manganese oxide octahedral molecular sieve (OMS-2) catalysts with cactus-like nanorod morphology are in situ constructed on industrial cordierite monoliths for soot combustion. The specific structure of the catalysts provides sufficient macroporous space to improve the soot-catalyst contact efficiency. Compared with traditional powder-coated catalysts, the consumption of the as-synthesized catalyst is saved by similar to 13 times with the same thickness, and the contact area is enlarged by -4 times with the same weight. Our findings show that the interface interaction between Co3O4 and OMS-2 promotes the generation of oxygen vacancies. The isotopic 1802 results reveal that the number of active sites for soot combustion on the Co3O4 modified catalyst is 3 times larger than that on OMS-2 alone. Additionally, this interaction accelerates the activation of gaseous oxygen, and especially enhances the intrinsic activity, as well. The above advantages improve the apparent soot oxidation activity by similar to 11 times.

Automated summary

The interface interaction between Co3O4 and OMS-2 promotes the generation of oxygen vacancies, enhancing the activity sites for soot combustion. With optimized catalyst structure design, the apparent soot oxidation activity is significantly improved.