Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

Rima Isaifan, William D. Penwell, Joao O C Filizzola, Javier B. Giorgi, Elena A. Baranova

Research output: Contribution to journalArticle

Abstract

The novel Sm1-xCexFeO3-δ (x = 0, 0.01, 0.05) (SCF) perovskites with and without 1 wt% of Pt nanoparticles (NPs) were investigated for carbon monoxide and ethylene oxidation in the temperature range of 25-350 °C. All perovskites were predominantly ionic conductors, with ionic conductivities two orders of magnitude higher than the electronic contribution. Furthermore, the cerium doping increases the ionic conductivity of these materials at high temperatures. The bare SCF perovskites possessed catalytic activity for both reactions; however the Pt-supported catalysts had 50-100 °C lower light-off temperatures than the corresponding perovskites. More significantly, the enhancement in the catalytic activity of the Pt/SCF family with respect to other Pt-supported catalysts was shown by the lower activation energies, which were 25.7 kJ/mol over Pt/Sm0.95Ce0.05FeO3-δ and 18.3 kJ/mol over Pt/Sm0.99Ce0.01FeO3-δ for CO and ethylene oxidation, respectively. The corresponding activation energies for Pt NPs supported on conventional γ-Al2O3 were 57.1 and 32 kJ/mol, and on ionically conductive yttria-stabilized zirconia (YSZ) were 35.8 and 22 kJ/mol for CO and C2H4 oxidation, respectively. The increased activity was attributed to the high ionic conductivity (O2-) of the perovskite supports at 100-400 °C that facilitates the spontaneous backspillover of O2- promoters from the lattice to the gas-exposed Pt nanoparticle surface. The promoters alter the adsorption strength of reactants similar to the electrochemical promotion mechanism observed under polarization.

Original languageEnglish
Pages (from-to)1218-1227
Number of pages10
JournalTopics in Catalysis
Volume58
Issue number18-20
DOIs
Publication statusPublished - 1 Nov 2015
Externally publishedYes

Fingerprint

Ionic conductivity
Carbon Monoxide
Carbon monoxide
Perovskite
Ethylene
Oxygen
Nanoparticles
Catalyst supports
Oxidation
Catalyst activity
Activation energy
Cerium
Yttria stabilized zirconia
Temperature
Gases
Doping (additives)
Polarization
Adsorption
ethylene
perovskite

Keywords

  • Carbon monoxide
  • Electrochemical promotion
  • Ethylene
  • Ionic conductivity
  • Perovskites
  • Platinum nanoparticles

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation. / Isaifan, Rima; Penwell, William D.; Filizzola, Joao O C; Giorgi, Javier B.; Baranova, Elena A.

In: Topics in Catalysis, Vol. 58, No. 18-20, 01.11.2015, p. 1218-1227.

Research output: Contribution to journalArticle

Isaifan, Rima ; Penwell, William D. ; Filizzola, Joao O C ; Giorgi, Javier B. ; Baranova, Elena A. / Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation. In: Topics in Catalysis. 2015 ; Vol. 58, No. 18-20. pp. 1218-1227.
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AU - Isaifan, Rima

AU - Penwell, William D.

AU - Filizzola, Joao O C

AU - Giorgi, Javier B.

AU - Baranova, Elena A.

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AB - The novel Sm1-xCexFeO3-δ (x = 0, 0.01, 0.05) (SCF) perovskites with and without 1 wt% of Pt nanoparticles (NPs) were investigated for carbon monoxide and ethylene oxidation in the temperature range of 25-350 °C. All perovskites were predominantly ionic conductors, with ionic conductivities two orders of magnitude higher than the electronic contribution. Furthermore, the cerium doping increases the ionic conductivity of these materials at high temperatures. The bare SCF perovskites possessed catalytic activity for both reactions; however the Pt-supported catalysts had 50-100 °C lower light-off temperatures than the corresponding perovskites. More significantly, the enhancement in the catalytic activity of the Pt/SCF family with respect to other Pt-supported catalysts was shown by the lower activation energies, which were 25.7 kJ/mol over Pt/Sm0.95Ce0.05FeO3-δ and 18.3 kJ/mol over Pt/Sm0.99Ce0.01FeO3-δ for CO and ethylene oxidation, respectively. The corresponding activation energies for Pt NPs supported on conventional γ-Al2O3 were 57.1 and 32 kJ/mol, and on ionically conductive yttria-stabilized zirconia (YSZ) were 35.8 and 22 kJ/mol for CO and C2H4 oxidation, respectively. The increased activity was attributed to the high ionic conductivity (O2-) of the perovskite supports at 100-400 °C that facilitates the spontaneous backspillover of O2- promoters from the lattice to the gas-exposed Pt nanoparticle surface. The promoters alter the adsorption strength of reactants similar to the electrochemical promotion mechanism observed under polarization.

KW - Carbon monoxide

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KW - Ethylene

KW - Ionic conductivity

KW - Perovskites

KW - Platinum nanoparticles

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