The effect of Ni in Pd-Ni/(Ce,Zr)O-x/Al2O3 catalysts used for stoichiometric CO and NO elimination. Part 2: Catalytic activity and in situ spectroscopic studies

A B Hungria, M Fernandez-Garcia, J A Anderson, A Martinez-Arias

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Pd-Ni catalysts supported on Al2O3, (Ce,Zr)O-X/Al2O3, and (Ce,Zr)O-X, were examined with the principle objective of determining the effects of Ni on catalytic activity for CO oxidation and NO reduction reactions under stoichiometric conditions. Catalytic activity findings for the CO + O-2 and CO + O-2 + NO reactions were analyzed in conjunction with in situ DRIFTS and XANES results to obtain information on the processes occurring in the catalysts during the course of the reactions. The results reveal a significant dependence on the nature of the support in terms of the catalytic changes produced by nickel. In the absence of significant nickel-induced electronic perturbations of palladium, these are related to indirect effects on palladium distribution over the catalysts or to a certain impediment of the interactions between active palladium and Ce-Zr mixed-oxide components. Significant promotion of CO oxidation was observed for the (Ce,Zr)O-X/Al2O3-supported catalyst, which reveals a relevant role for the particle size of the nanostructured Ce-Zr mixed oxide in this reaction. (c) 2005 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)262-271
Number of pages10
JournalJournal of Catalysis
Volume235
DOIs
Publication statusPublished - 2005

Keywords

  • Pd-Ni catalysts
  • TWC
  • CeO2-ZrO2
  • Al2O3
  • CO oxidation
  • NO reduction
  • DRIFTS
  • PdK-edge XANES
  • REFLECTION-ABSORPTION SPECTROSCOPY
  • CEO2-ZRO2 MIXED OXIDES
  • 3-WAY CATALYSTS
  • INFRARED-SPECTROSCOPY
  • CERIUM OXIDE
  • ELECTRICAL-CONDUCTIVITY
  • ALUMINATE SUPPORT
  • MODEL CATALYSTS
  • PD
  • ADSORPTION

Cite this

The effect of Ni in Pd-Ni/(Ce,Zr)O-x/Al2O3 catalysts used for stoichiometric CO and NO elimination. Part 2: Catalytic activity and in situ spectroscopic studies. / Hungria, A B ; Fernandez-Garcia, M ; Anderson, J A ; Martinez-Arias, A .

In: Journal of Catalysis, Vol. 235, 2005, p. 262-271.

Research output: Contribution to journalArticle

@article{838696d54bff4357899880843ceff481,
title = "The effect of Ni in Pd-Ni/(Ce,Zr)O-x/Al2O3 catalysts used for stoichiometric CO and NO elimination. Part 2: Catalytic activity and in situ spectroscopic studies",
abstract = "Pd-Ni catalysts supported on Al2O3, (Ce,Zr)O-X/Al2O3, and (Ce,Zr)O-X, were examined with the principle objective of determining the effects of Ni on catalytic activity for CO oxidation and NO reduction reactions under stoichiometric conditions. Catalytic activity findings for the CO + O-2 and CO + O-2 + NO reactions were analyzed in conjunction with in situ DRIFTS and XANES results to obtain information on the processes occurring in the catalysts during the course of the reactions. The results reveal a significant dependence on the nature of the support in terms of the catalytic changes produced by nickel. In the absence of significant nickel-induced electronic perturbations of palladium, these are related to indirect effects on palladium distribution over the catalysts or to a certain impediment of the interactions between active palladium and Ce-Zr mixed-oxide components. Significant promotion of CO oxidation was observed for the (Ce,Zr)O-X/Al2O3-supported catalyst, which reveals a relevant role for the particle size of the nanostructured Ce-Zr mixed oxide in this reaction. (c) 2005 Elsevier Inc. All rights reserved.",
keywords = "Pd-Ni catalysts, TWC, CeO2-ZrO2, Al2O3, CO oxidation, NO reduction, DRIFTS, PdK-edge XANES, REFLECTION-ABSORPTION SPECTROSCOPY, CEO2-ZRO2 MIXED OXIDES, 3-WAY CATALYSTS, INFRARED-SPECTROSCOPY, CERIUM OXIDE, ELECTRICAL-CONDUCTIVITY, ALUMINATE SUPPORT, MODEL CATALYSTS, PD, ADSORPTION",
author = "Hungria, {A B} and M Fernandez-Garcia and Anderson, {J A} and A Martinez-Arias",
year = "2005",
doi = "10.1016/j.jcat.2005.08.012",
language = "English",
volume = "235",
pages = "262--271",
journal = "Journal of Catalysis",
issn = "0021-9517",
publisher = "ACADEMIC PRESS INC ELSEVIER SCIENCE",

}

TY - JOUR

T1 - The effect of Ni in Pd-Ni/(Ce,Zr)O-x/Al2O3 catalysts used for stoichiometric CO and NO elimination. Part 2: Catalytic activity and in situ spectroscopic studies

AU - Hungria, A B

AU - Fernandez-Garcia, M

AU - Anderson, J A

AU - Martinez-Arias, A

PY - 2005

Y1 - 2005

N2 - Pd-Ni catalysts supported on Al2O3, (Ce,Zr)O-X/Al2O3, and (Ce,Zr)O-X, were examined with the principle objective of determining the effects of Ni on catalytic activity for CO oxidation and NO reduction reactions under stoichiometric conditions. Catalytic activity findings for the CO + O-2 and CO + O-2 + NO reactions were analyzed in conjunction with in situ DRIFTS and XANES results to obtain information on the processes occurring in the catalysts during the course of the reactions. The results reveal a significant dependence on the nature of the support in terms of the catalytic changes produced by nickel. In the absence of significant nickel-induced electronic perturbations of palladium, these are related to indirect effects on palladium distribution over the catalysts or to a certain impediment of the interactions between active palladium and Ce-Zr mixed-oxide components. Significant promotion of CO oxidation was observed for the (Ce,Zr)O-X/Al2O3-supported catalyst, which reveals a relevant role for the particle size of the nanostructured Ce-Zr mixed oxide in this reaction. (c) 2005 Elsevier Inc. All rights reserved.

AB - Pd-Ni catalysts supported on Al2O3, (Ce,Zr)O-X/Al2O3, and (Ce,Zr)O-X, were examined with the principle objective of determining the effects of Ni on catalytic activity for CO oxidation and NO reduction reactions under stoichiometric conditions. Catalytic activity findings for the CO + O-2 and CO + O-2 + NO reactions were analyzed in conjunction with in situ DRIFTS and XANES results to obtain information on the processes occurring in the catalysts during the course of the reactions. The results reveal a significant dependence on the nature of the support in terms of the catalytic changes produced by nickel. In the absence of significant nickel-induced electronic perturbations of palladium, these are related to indirect effects on palladium distribution over the catalysts or to a certain impediment of the interactions between active palladium and Ce-Zr mixed-oxide components. Significant promotion of CO oxidation was observed for the (Ce,Zr)O-X/Al2O3-supported catalyst, which reveals a relevant role for the particle size of the nanostructured Ce-Zr mixed oxide in this reaction. (c) 2005 Elsevier Inc. All rights reserved.

KW - Pd-Ni catalysts

KW - TWC

KW - CeO2-ZrO2

KW - Al2O3

KW - CO oxidation

KW - NO reduction

KW - DRIFTS

KW - PdK-edge XANES

KW - REFLECTION-ABSORPTION SPECTROSCOPY

KW - CEO2-ZRO2 MIXED OXIDES

KW - 3-WAY CATALYSTS

KW - INFRARED-SPECTROSCOPY

KW - CERIUM OXIDE

KW - ELECTRICAL-CONDUCTIVITY

KW - ALUMINATE SUPPORT

KW - MODEL CATALYSTS

KW - PD

KW - ADSORPTION

U2 - 10.1016/j.jcat.2005.08.012

DO - 10.1016/j.jcat.2005.08.012

M3 - Article

VL - 235

SP - 262

EP - 271

JO - Journal of Catalysis

JF - Journal of Catalysis

SN - 0021-9517

ER -