Influence of CeO2 morphology on the catalytic activity of CeO2–Pt hybrids for CO oxidation

Nisha Singhania; E. A. Anumol; N. Ravishankar; Giridhar Madras

doi:10.1039/C3DT51364E

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Influence of CeO₂ morphology on the catalytic activity of CeO₂–Pt hybrids for CO oxidation†

Nisha Singhania,^a E. A. Anumol,^a N. Ravishankar*^a and Giridhar Madras^b

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* Corresponding authors

^a Materials Research Center, Indian Institute of Science, Bangalore 560012, India
E-mail: nravi@mrc.iisc.ernet.in
Tel: +91 8022933255

^b Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India

Abstract

Ceria, because of its excellent redox behavior and oxygen storage capacity, is used as a catalyst for several technologically important reactions. In the present study, different morphologies of nano-CeO₂ (rods, cubes, octahedra) were synthesized using the hydrothermal route. An ultrafast microwave-assisted method was used to efficiently attach Pt particles to the CeO₂ polyhedra. These nanohybrids were tested as catalysts for the CO oxidation reaction. The CeO₂/Pt catalyst with nanorods as the support was found to be the most active catalyst. XPS and IR spectroscopy measurements were carried out in order to obtain a mechanistic understanding and it was observed that the adsorbed carbonates with lower stability on the reactive planes of nanorods and cubes are the major contributor to this enhanced catalytic activity.

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Article information

DOI: https://doi.org/10.1039/C3DT51364E
Article type: Paper
Submitted: 25 May 2013
Accepted: 13 Aug 2013
First published: 14 Aug 2013

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Dalton Trans., 2013,42, 15343-15354

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Influence of CeO₂ morphology on the catalytic activity of CeO₂–Pt hybrids for CO oxidation

N. Singhania, E. A. Anumol, N. Ravishankar and G. Madras, Dalton Trans., 2013, 42, 15343 DOI: 10.1039/C3DT51364E

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Dalton Transactions