Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 17, Pages 14149-14156Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj01184b
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Funding
- University Grants Commission (UGC), New Delhi
- DST-Science and Engineering Research Board (SERB) [PDF/2016/003661]
- Department of Atomic Energy (DAE), Mumbai
- UGC-Dr D S Kothari Postdoctoral Fellowship (DSKPDF) Scheme, New Delhi
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The present work reports the synthesis and characterization of a ceria-based hybrid nano-catalyst composed of a Snx+ dopant incorporated in the CeO2 crystal lattice and a finely dispersed CoOx phase on its surface. Characterization studies showed that the Ce, Sn, and Co cations were present in their multivalent oxidation states. The CoOx was confirmed to be Co3O4. A HRTEM image depicted the presence of a stepped catalyst surface, which has a special importance in enhancing the heterogeneous catalytic reaction rate carried out on the solid catalyst surface. The prepared materials were subjected to diesel soot oxidation catalysis. Model soot was combusted in the presence of air under both tight and loose contact conditions of the catalyst and soot. The hybrid catalyst exhibited improved performance compared to the Sn-doped nano-CeO2 and nano-CeO2 supported CoOx catalysts. The improved catalytic activity was attributed to the existence of synergism among the multivalent cations and the stepped surface of the hybrid catalyst, which act as the potential active sites for oxidation catalysis.
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