Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Synthesis and characterization of doped nano-sized ceria-zirconia solid solutions
AU - Weng, X.
AU - Perston, B.
AU - Wang, X.Z.
AU - Abrahams, I.
AU - Lin, T.
AU - Yang, S.
AU - Evans, J.R.G.
AU - Morgan, D.J.
AU - Carley, A.F.
AU - Bowker, M.
AU - Knowles, J.C.
AU - Rehman, I.
AU - Darr, J.A.
PY - 2009
Y1 - 2009
N2 - Two compositions Ce0.50Zr0.39La0.04Y0.07O2-δ and Ce0.25Zr0.65La0.04Y0.06O2-δ based on ceria-zirconia solid solutions were prepared as nanopowders using a continuous hydrothermal flow synthesis reactor, followed by either freeze-drying or hotplate-drying of the slurry. Each dried nanopowder was then subjected to 10 h heat-treatment at 1000 °C, 1100 °C or 1200 °C in air (to simulate accelerated ageing). The reducibility and hydrogen consumption of the oxidised samples were measured using temperature programmed reduction (TPR) up to 1000 °C. The effects of composition, drying method and heat-treatment temperature were evaluated on the TPR profiles of the materials. The powders were further investigated using a range of analytical methods including UV/Vis spectroscopy (which yielded colour data), Raman spectroscopy, powder X-ray diffraction, BET surface area measurements and X-ray photoelectron spectroscopy (XPS). Chemometric methods were used to investigate relationships between the spectroscopic and total oxygen storage capacity (OSC) data. Principal component analysis (PCA) was used to provide a simple interpretation of the effects of various synthesis and treatment parameters on Raman spectra. Principal component regression (PCR) was used to build regression models relating the Raman spectra and the temperature of hydrogen consumption peak at several set temperatures in the TPR. The total hydrogen consumption of the materials was generally high, while the drying and heat-treatment conditions appeared to have a significant effect on the final properties of the resulting powders, such as the surface area and total oxygen storage capacity. © 2009 Elsevier B.V.
AB - Two compositions Ce0.50Zr0.39La0.04Y0.07O2-δ and Ce0.25Zr0.65La0.04Y0.06O2-δ based on ceria-zirconia solid solutions were prepared as nanopowders using a continuous hydrothermal flow synthesis reactor, followed by either freeze-drying or hotplate-drying of the slurry. Each dried nanopowder was then subjected to 10 h heat-treatment at 1000 °C, 1100 °C or 1200 °C in air (to simulate accelerated ageing). The reducibility and hydrogen consumption of the oxidised samples were measured using temperature programmed reduction (TPR) up to 1000 °C. The effects of composition, drying method and heat-treatment temperature were evaluated on the TPR profiles of the materials. The powders were further investigated using a range of analytical methods including UV/Vis spectroscopy (which yielded colour data), Raman spectroscopy, powder X-ray diffraction, BET surface area measurements and X-ray photoelectron spectroscopy (XPS). Chemometric methods were used to investigate relationships between the spectroscopic and total oxygen storage capacity (OSC) data. Principal component analysis (PCA) was used to provide a simple interpretation of the effects of various synthesis and treatment parameters on Raman spectra. Principal component regression (PCR) was used to build regression models relating the Raman spectra and the temperature of hydrogen consumption peak at several set temperatures in the TPR. The total hydrogen consumption of the materials was generally high, while the drying and heat-treatment conditions appeared to have a significant effect on the final properties of the resulting powders, such as the surface area and total oxygen storage capacity. © 2009 Elsevier B.V.
KW - Ceria-zirconia solid solution
KW - Chemometric
KW - Hydrothermal synthesis
KW - Nano
KW - Supercritical water
KW - Accelerated ageing
KW - Analytical method
KW - BET surface area measurement
KW - Chemometric method
KW - Drying methods
KW - Flow synthesis
KW - Heat treatment temperature
KW - Hot plates
KW - Nano powders
KW - Nano-sized
KW - Powder X ray diffraction
KW - Principal component regression
KW - Raman spectra
KW - Regression model
KW - Surface area
KW - Synthesis and characterization
KW - Temperature-programmed reduction
KW - Total oxygen
KW - Treatment parameters
KW - UV/ Vis spectroscopy
KW - Cerium
KW - Cerium alloys
KW - Cerium compounds
KW - Chemical analysis
KW - Crystallization
KW - Dewatering
KW - Hydrogen
KW - Hydrogen storage
KW - Lanthanum
KW - Nanostructured materials
KW - Oxygen
KW - Powders
KW - Principal component analysis
KW - Raman scattering
KW - Raman spectroscopy
KW - Reaction kinetics
KW - Regression analysis
KW - Solid solutions
KW - Solidification
KW - Spectrum analysis
KW - X ray photoelectron spectroscopy
KW - X ray powder diffraction
KW - Zirconia
KW - Zirconium
U2 - 10.1016/j.apcatb.2009.03.031
DO - 10.1016/j.apcatb.2009.03.031
M3 - Journal article
VL - 90
SP - 405
EP - 415
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
IS - 3-4
ER -