Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts

E. O. Jardim, S. Rico-Francés, F. Coloma, J. A. Anderson, Enrique V. Ramos-Fernandez*, J. Silvestre-Albero, A. Sepúlveda-Escribano

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A series of CeO2 -Nb2 O5 mixed oxides with different Nb content, as well as the pure oxides, have been synthesized by co-precipitation with excess urea. These materials have been used as supports for platinum catalysts, with [Pt(NH3) 4](NO3)2 as precursor. Both supports and catalysts have been characterized by several techniques: N2 physisorption at 77 K, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy, temperature-programmed reduction and temperature-programmed desorption (CO and H2), and their catalytic behaviour has been determined in the PROX reaction, both with an ideal gas mixture (CO, O2 and H2) and in simulated reformate gas containing CO2 and H2O. Raman spectroscopy analysis has shown the likely substitution of some Ce4+ cations by Nb5+ to some extent in supports with low niobium contents. Moreover, the presence of Nb in the supports hinders their ability to adsorb CO and to oxidize it to CO2. However, an improvement of the catalytic activity for CO oxidation is obtained by adding Nb to the support, although the Pt/Nb2O5 catalyst shows very low activity. The best results are found with the Pt/0.7CeO2-0.3Nb2O5 catalyst, which shows a high CO conversion (85%) and a high yield (around 0.6) after a reduction treatment at 523 K. The effect of the presence of CO2 and H2O in the feed has also been determined.

Original languageEnglish
Pages (from-to)201-211
Number of pages11
JournalApplied Catalysis A: General
Volume492
Early online date23 Dec 2014
DOIs
Publication statusPublished - 25 Feb 2015

Fingerprint

Carbon Monoxide
Catalyst supports
Oxidation
Catalysts
Raman spectroscopy
Oxides
Physisorption
Niobium
Temperature programmed desorption
Coprecipitation
Ultraviolet spectroscopy
Urea
Gas mixtures
Platinum
Catalyst activity
Substitution reactions
X ray photoelectron spectroscopy
Positive ions
Cations
Transmission electron microscopy

Keywords

  • Ceria
  • DRIFT
  • Niobia
  • Platinum
  • PROX

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Jardim, E. O., Rico-Francés, S., Coloma, F., Anderson, J. A., Ramos-Fernandez, E. V., Silvestre-Albero, J., & Sepúlveda-Escribano, A. (2015). Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts. Applied Catalysis A: General, 492, 201-211. https://doi.org/10.1016/j.apcata.2014.12.032

Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts. / Jardim, E. O.; Rico-Francés, S.; Coloma, F.; Anderson, J. A.; Ramos-Fernandez, Enrique V.; Silvestre-Albero, J.; Sepúlveda-Escribano, A.

In: Applied Catalysis A: General, Vol. 492, 25.02.2015, p. 201-211.

Research output: Contribution to journalArticle

Jardim, EO, Rico-Francés, S, Coloma, F, Anderson, JA, Ramos-Fernandez, EV, Silvestre-Albero, J & Sepúlveda-Escribano, A 2015, 'Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts', Applied Catalysis A: General, vol. 492, pp. 201-211. https://doi.org/10.1016/j.apcata.2014.12.032
Jardim EO, Rico-Francés S, Coloma F, Anderson JA, Ramos-Fernandez EV, Silvestre-Albero J et al. Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts. Applied Catalysis A: General. 2015 Feb 25;492:201-211. https://doi.org/10.1016/j.apcata.2014.12.032
Jardim, E. O. ; Rico-Francés, S. ; Coloma, F. ; Anderson, J. A. ; Ramos-Fernandez, Enrique V. ; Silvestre-Albero, J. ; Sepúlveda-Escribano, A. / Preferential oxidation of CO in excess of H2 on Pt/CeO2-Nb2O5 catalysts. In: Applied Catalysis A: General. 2015 ; Vol. 492. pp. 201-211.
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abstract = "A series of CeO2 -Nb2 O5 mixed oxides with different Nb content, as well as the pure oxides, have been synthesized by co-precipitation with excess urea. These materials have been used as supports for platinum catalysts, with [Pt(NH3) 4](NO3)2 as precursor. Both supports and catalysts have been characterized by several techniques: N2 physisorption at 77 K, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy, temperature-programmed reduction and temperature-programmed desorption (CO and H2), and their catalytic behaviour has been determined in the PROX reaction, both with an ideal gas mixture (CO, O2 and H2) and in simulated reformate gas containing CO2 and H2O. Raman spectroscopy analysis has shown the likely substitution of some Ce4+ cations by Nb5+ to some extent in supports with low niobium contents. Moreover, the presence of Nb in the supports hinders their ability to adsorb CO and to oxidize it to CO2. However, an improvement of the catalytic activity for CO oxidation is obtained by adding Nb to the support, although the Pt/Nb2O5 catalyst shows very low activity. The best results are found with the Pt/0.7CeO2-0.3Nb2O5 catalyst, which shows a high CO conversion (85{\%}) and a high yield (around 0.6) after a reduction treatment at 523 K. The effect of the presence of CO2 and H2O in the feed has also been determined.",
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AU - Ramos-Fernandez, Enrique V.

AU - Silvestre-Albero, J.

AU - Sepúlveda-Escribano, A.

N1 - The authors gratefully acknowledge the financial support from the MINECO (Spain, Project MAT2010-21147) and Generalitat Valenciana (PROMETEO/2009/002–FEDER and PROMETEOII/2014/004–FEDER). EVRF thanks the MINECO for his Ramón y Cajal Fellowship RYC-2012-11427. EOJ thanks the CNPq – Brazil for her grant. We thank Drs. S.B. Campbell and F.M. McKenna, University of Aberdeen for assistance in performing the DRIFT experiments.

PY - 2015/2/25

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N2 - A series of CeO2 -Nb2 O5 mixed oxides with different Nb content, as well as the pure oxides, have been synthesized by co-precipitation with excess urea. These materials have been used as supports for platinum catalysts, with [Pt(NH3) 4](NO3)2 as precursor. Both supports and catalysts have been characterized by several techniques: N2 physisorption at 77 K, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy, temperature-programmed reduction and temperature-programmed desorption (CO and H2), and their catalytic behaviour has been determined in the PROX reaction, both with an ideal gas mixture (CO, O2 and H2) and in simulated reformate gas containing CO2 and H2O. Raman spectroscopy analysis has shown the likely substitution of some Ce4+ cations by Nb5+ to some extent in supports with low niobium contents. Moreover, the presence of Nb in the supports hinders their ability to adsorb CO and to oxidize it to CO2. However, an improvement of the catalytic activity for CO oxidation is obtained by adding Nb to the support, although the Pt/Nb2O5 catalyst shows very low activity. The best results are found with the Pt/0.7CeO2-0.3Nb2O5 catalyst, which shows a high CO conversion (85%) and a high yield (around 0.6) after a reduction treatment at 523 K. The effect of the presence of CO2 and H2O in the feed has also been determined.

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