Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX)

Erika O Jardim, Soledad Rico-Francés, Fernando Coloma, James A Anderson, Joaquín Silvestre-Albero, Antonio Sepúlveda-Escribano

Research output: Contribution to journalArticle

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Abstract

The effect of the metal precursor (presence or absence of chlorine) on the preferential oxidation of CO in the presence of H2 over Pt/CeO2 catalysts has been studied. The catalysts are prepared using (Pt(NH3)4)(NO3)2 and H2PtCl6, as precursors, in order to ascertain the effect of the chlorine species on the chemical properties of the support and on the catalytic behavior of these systems in the PROX reaction. The results show that chloride species exert an important effect on the redox properties of the oxide support due to surface chlorination. Consequently, the chlorinated catalyst exhibits a poorer catalytic activity at low temperatures compared with the chlorine-free catalyst, and this is accompanied by a higher selectivity to CO2 even at high reaction temperatures. It is proposed that the CO oxidation mechanism follows different pathways on each catalyst.

Original languageEnglish
Pages (from-to)45-55
Number of pages11
JournalJournal of Colloid and Interface Science
Volume443
Early online date10 Dec 2014
DOIs
Publication statusPublished - 1 Apr 2015

Fingerprint

Cerium compounds
Carbon Monoxide
Metals
Chlorine
Oxidation
Catalysts
Chlorination
Oxides
Chemical properties
Chlorides
Catalyst activity
Temperature

Keywords

  • metal precursor
  • Pt
  • Ceria
  • PROX
  • drifts

Cite this

Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX). / Jardim, Erika O; Rico-Francés, Soledad; Coloma, Fernando; Anderson, James A; Silvestre-Albero, Joaquín; Sepúlveda-Escribano, Antonio.

In: Journal of Colloid and Interface Science, Vol. 443, 01.04.2015, p. 45-55.

Research output: Contribution to journalArticle

Jardim, Erika O ; Rico-Francés, Soledad ; Coloma, Fernando ; Anderson, James A ; Silvestre-Albero, Joaquín ; Sepúlveda-Escribano, Antonio. / Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX). In: Journal of Colloid and Interface Science. 2015 ; Vol. 443. pp. 45-55.
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abstract = "The effect of the metal precursor (presence or absence of chlorine) on the preferential oxidation of CO in the presence of H2 over Pt/CeO2 catalysts has been studied. The catalysts are prepared using (Pt(NH3)4)(NO3)2 and H2PtCl6, as precursors, in order to ascertain the effect of the chlorine species on the chemical properties of the support and on the catalytic behavior of these systems in the PROX reaction. The results show that chloride species exert an important effect on the redox properties of the oxide support due to surface chlorination. Consequently, the chlorinated catalyst exhibits a poorer catalytic activity at low temperatures compared with the chlorine-free catalyst, and this is accompanied by a higher selectivity to CO2 even at high reaction temperatures. It is proposed that the CO oxidation mechanism follows different pathways on each catalyst.",
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N1 - Copyright © 2014 Elsevier Inc. All rights reserved. Acknowledgments The authors gratefully acknowledge financial support from Ministerio de Ciencia e Innovación (Project MAT2010-21147) and Generalitat Valenciana (PROMETEO/2009/002 – FEDER and PROMETEOII/2014/004) (Spain). EOJ thanks the CNPq – Brazil for her grant. We thank S.B. Campbell and F.M. McKenna (University of Aberdeen) for assistance in performing the DRIFT experiments.

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AB - The effect of the metal precursor (presence or absence of chlorine) on the preferential oxidation of CO in the presence of H2 over Pt/CeO2 catalysts has been studied. The catalysts are prepared using (Pt(NH3)4)(NO3)2 and H2PtCl6, as precursors, in order to ascertain the effect of the chlorine species on the chemical properties of the support and on the catalytic behavior of these systems in the PROX reaction. The results show that chloride species exert an important effect on the redox properties of the oxide support due to surface chlorination. Consequently, the chlorinated catalyst exhibits a poorer catalytic activity at low temperatures compared with the chlorine-free catalyst, and this is accompanied by a higher selectivity to CO2 even at high reaction temperatures. It is proposed that the CO oxidation mechanism follows different pathways on each catalyst.

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