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.
Original language | English |
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Pages (from-to) | 245-254 |
Number of pages | 10 |
Journal | Catalysis Today |
Volume | 90 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 1 Jul 2004 |
Event | Environmental Catalysis and Eco-Materials - Beijing, China Duration: 7 Oct 2003 → 7 Oct 2003 |
Scopus Subject Areas
- Catalysis
- Chemistry(all)
User-Defined Keywords
- O/ O isotope exchange
- CeO-ZrO
- Lattice oxygen mobility
- Oxygen storage capacity
- PrO-ZrO
- Redox property