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Promoting Effect of CeO2 in Combustion Synthesized Pt/CeO2 Catalyst for CO Oxidation
Abstract
A 1% Pt/CeO 2 catalyst prepared by the solution combustion method shows a higher catalytic activity for CO oxidation by O 2 compared to Pt metal particles. At least six hydrogen atoms are taken up per Pt at −25 °C. The structure of 1% Pt/CeO 2 catalyst has been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. Rietveld refinement shows that Pt ions are incorporated into the CeO 2 matrix in the form of Ce 1 - x Pt x O 2 - δ solid solution. A decrease in oxygen content in 1% Pt/CeO 2 is seen in relation to pure CeO 2 . TEM studies show that Pt is dispersed as atoms or ions and only a small amount as Pt metal particles. The Pt(4f) core level region in XPS shows that Pt is present mostly in the Pt 2+ ionic state on CeO 2 surface. FTIR of 1% Pt/CeO 2 shows a strongly adsorbed CO peak at 2082 cm -1 corresponding to oxidized Pt. These structural studies show that Pt ions in the catalyst are substituted for Ce 4+ ions in the form of Ce 1 - x Pt x O 2 - δ, creating oxide ion vacancies leading to a strong Pt 2+ −CeO 2 interaction that is responsible for higher catalytic activity.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
Cited by
Nagaveni, K., Hegde, M. S., & Madras, G. (2004) · The Journal of Physical Chemistry B · doi:10.1021/jp047917v · Cited by 567
Self-citationLuo, Y., Calvillo, L., Daiguebonne, C., Daletou, M. K., Granozzi, G., & Alonso-Vante, N. (2016) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2016.02.028 · Cited by 72
Metadata
- Authors
- Bera, P., Gayen, A., Hegde, M. S., Lalla, N. P., Spadaro, L., Frusteri, F., & Arena, F.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-05-28
- Volume
- 107
- Issue
- 25
- Pages
- 6122-6130
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2284797707
- Cited by
- 295
- References
- 1
- FWCI
- 3.81
- Type
- journal article
- Language
- en
- Open access
- closed
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- Bera, P., Gayen, A., Hegde, M. S., Lalla, N. P., Spadaro, L., Frusteri, F., & Arena, F. (2003). Promoting Effect of CeO2 in Combustion Synthesized Pt/CeO2 Catalyst for CO Oxidation. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp022132f
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