Defective structure, oxygen mobility, oxygen storage capacity, and redox properties of RE-based (RE = Ce, Pr) solid solutions

H. He; H. X. Dai; C. T. Au

doi:10.1016/j.cattod.2004.04.033

Defective structure, oxygen mobility, oxygen storage capacity, and redox properties of RE-based (RE = Ce, Pr) solid solutions

H. He^*, H. X. Dai, C. T. Au

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Conference article › peer-review

252 Citations (Scopus)

Abstract

Defective structures, surface textures, oxygen mobility, oxygen storage capacity (OSC), and redox properties of RE_0.6Zr_0.4O ₂ and of RE_0.6Zr_0.4-xY_xO₂ (RE=Ce, Pr; x=0, 0.05) solid solutions have been investigated using X-ray diffraction (XRD), temperature-programmed desorption (TPD), temperature- programmed reduction (TPR), O₂-H₂ and O₂-CO titration, ¹⁸O/¹⁶O isotope exchange, CO pulsing reaction, and X-ray photoelectron spectroscopy (XPS) techniques. The effects of doping noble metal onto RE_0.6Zr_0.4-xY_xO₂ on oxygen mobility and surface oxygen activities have also been studied. Based on the experimental outcomes, we conclude that: (i) a Pr-based solid solution has better redox behavior than a Ce-based one; (ii) incorporation of yttrium ions in the lattices of CZ and PZ solid solutions could result in an enhancement in oxygen vacancy concentration, Ce⁴⁺/Ce³⁺ and Pr ⁴⁺/Pr³⁺ redox properties, lattice oxygen mobility, and oxygen storage capacity; and (iii) doping the noble metal (Rh, Pt, and Pd) onto RE-based solid solution has positive effect on the properties concerned in this work.

Original language	English
Pages (from-to)	245-254
Number of pages	10
Journal	Catalysis Today
Volume	90
Issue number	3-4
DOIs	https://doi.org/10.1016/j.cattod.2004.04.033
Publication status	Published - 1 Jul 2004
Event	Environmental Catalysis and Eco-Materials - Beijing, China Duration: 7 Oct 2003 → 7 Oct 2003

User-Defined Keywords

O/ O isotope exchange
CeO-ZrO
Lattice oxygen mobility
Oxygen storage capacity
PrO-ZrO
Redox property

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10.1016/j.cattod.2004.04.033

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title = "Defective structure, oxygen mobility, oxygen storage capacity, and redox properties of RE-based (RE = Ce, Pr) solid solutions",

abstract = "Defective structures, surface textures, oxygen mobility, oxygen storage capacity (OSC), and redox properties of RE0.6Zr0.4O 2 and of RE0.6Zr0.4-xYxO2 (RE=Ce, Pr; x=0, 0.05) solid solutions have been investigated using X-ray diffraction (XRD), temperature-programmed desorption (TPD), temperature- programmed reduction (TPR), O2-H2 and O2-CO titration, 18O/16O isotope exchange, CO pulsing reaction, and X-ray photoelectron spectroscopy (XPS) techniques. The effects of doping noble metal onto RE0.6Zr0.4-xYxO2 on oxygen mobility and surface oxygen activities have also been studied. Based on the experimental outcomes, we conclude that: (i) a Pr-based solid solution has better redox behavior than a Ce-based one; (ii) incorporation of yttrium ions in the lattices of CZ and PZ solid solutions could result in an enhancement in oxygen vacancy concentration, Ce4+/Ce3+ and Pr 4+/Pr3+ redox properties, lattice oxygen mobility, and oxygen storage capacity; and (iii) doping the noble metal (Rh, Pt, and Pd) onto RE-based solid solution has positive effect on the properties concerned in this work.",

keywords = "O/ O isotope exchange, CeO-ZrO, Lattice oxygen mobility, Oxygen storage capacity, PrO-ZrO, Redox property",

author = "H. He and Dai, {H. X.} and Au, {C. T.}",

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T1 - Defective structure, oxygen mobility, oxygen storage capacity, and redox properties of RE-based (RE = Ce, Pr) solid solutions

AU - He, H.

AU - Dai, H. X.

AU - Au, C. T.

PY - 2004/7/1

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N2 - Defective structures, surface textures, oxygen mobility, oxygen storage capacity (OSC), and redox properties of RE0.6Zr0.4O 2 and of RE0.6Zr0.4-xYxO2 (RE=Ce, Pr; x=0, 0.05) solid solutions have been investigated using X-ray diffraction (XRD), temperature-programmed desorption (TPD), temperature- programmed reduction (TPR), O2-H2 and O2-CO titration, 18O/16O isotope exchange, CO pulsing reaction, and X-ray photoelectron spectroscopy (XPS) techniques. The effects of doping noble metal onto RE0.6Zr0.4-xYxO2 on oxygen mobility and surface oxygen activities have also been studied. Based on the experimental outcomes, we conclude that: (i) a Pr-based solid solution has better redox behavior than a Ce-based one; (ii) incorporation of yttrium ions in the lattices of CZ and PZ solid solutions could result in an enhancement in oxygen vacancy concentration, Ce4+/Ce3+ and Pr 4+/Pr3+ redox properties, lattice oxygen mobility, and oxygen storage capacity; and (iii) doping the noble metal (Rh, Pt, and Pd) onto RE-based solid solution has positive effect on the properties concerned in this work.

AB - Defective structures, surface textures, oxygen mobility, oxygen storage capacity (OSC), and redox properties of RE0.6Zr0.4O 2 and of RE0.6Zr0.4-xYxO2 (RE=Ce, Pr; x=0, 0.05) solid solutions have been investigated using X-ray diffraction (XRD), temperature-programmed desorption (TPD), temperature- programmed reduction (TPR), O2-H2 and O2-CO titration, 18O/16O isotope exchange, CO pulsing reaction, and X-ray photoelectron spectroscopy (XPS) techniques. The effects of doping noble metal onto RE0.6Zr0.4-xYxO2 on oxygen mobility and surface oxygen activities have also been studied. Based on the experimental outcomes, we conclude that: (i) a Pr-based solid solution has better redox behavior than a Ce-based one; (ii) incorporation of yttrium ions in the lattices of CZ and PZ solid solutions could result in an enhancement in oxygen vacancy concentration, Ce4+/Ce3+ and Pr 4+/Pr3+ redox properties, lattice oxygen mobility, and oxygen storage capacity; and (iii) doping the noble metal (Rh, Pt, and Pd) onto RE-based solid solution has positive effect on the properties concerned in this work.

KW - O/ O isotope exchange

KW - CeO-ZrO

KW - Lattice oxygen mobility

KW - Oxygen storage capacity

KW - PrO-ZrO

KW - Redox property

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DO - 10.1016/j.cattod.2004.04.033

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SN - 0920-5861

VL - 90

SP - 245

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JO - Catalysis Today

JF - Catalysis Today

IS - 3-4

T2 - Environmental Catalysis and Eco-Materials

Y2 - 7 October 2003 through 7 October 2003

ER -

Defective structure, oxygen mobility, oxygen storage capacity, and redox properties of RE-based (RE = Ce, Pr) solid solutions

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