Journal
NANOSCALE
Volume 8, Issue 11, Pages 5857-5864Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr05310b
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Funding
- National Natural Science Foundation of China [U1232118, 21276184, U1332102]
- 973 program [2014CB932403]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120032110014]
- Program of Introducing Talents of Discipline to China Universities [B06006]
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Crossed Fe2O3 nanosheets supported cobalt oxide nanoparticles on three-dimensionally macroporous nickel foam substrate (xCo/Fe-NF) was designed and successfully prepared through a facile hydrothermal and impregnation route. These catalysts showed high catalytic soot combustion activities under selfcapture contact mode. The three-dimensional macroporous structures of Ni foam and the crossed Fe2O3 nanosheets constituted macroporous voids can greatly increase the contact efficiency between soot particulates and catalysts. The interaction between Co and Fe facilitated the activation of the Fe-O bond and increased the amounts of active oxygen species, thus improving the redox property of the catalysts. The 0.6Co/Fe-NF catalyst exhibited the highest turnover frequency (TOF) for soot combustion, which is in good accordance with the largest amount of active oxygen species. Based upon the catalytic performance and multiple characterization results, two reaction pathways for soot oxidation are identified, namely, the direct oxidation by the activated oxygen species via oxygen vacancies and the NOx-aided soot oxidation.
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