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Sol-Gel Precursors and the Oxygen Storage Capacity of PrOy-ZrO2 Materials

Published online by Cambridge University Press:  10 February 2011

C. K. Narula
Affiliation:
Chemistry Department, Ford Motor Co., MD 3083, P.O. Box 2053, Dearborn, MI 48121
K. L. Taylor
Affiliation:
Chemistry Department, Ford Motor Co., MD 3083, P.O. Box 2053, Dearborn, MI 48121
L. P. Haack
Affiliation:
Chemistry Department, Ford Motor Co., MD 3083, P.O. Box 2053, Dearborn, MI 48121
L. F. Allard
Affiliation:
HTML, Oak Ridge National Laboratory, Oak Ridge, TN 37831
A. Datye
Affiliation:
Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, NM 87131
M. Yu. Sinev
Affiliation:
Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 11334, Russia
M. Shelef
Affiliation:
Chemical Engineering Department, Ford Motor Co., MD 3179, P.O. Box 2053, Dearborn, MI 48121
R. W. McCabe
Affiliation:
Chemical Engineering Department, Ford Motor Co., MD 3179, P.O. Box 2053, Dearborn, MI 48121
W. Chun
Affiliation:
Chemical Engineering Department, Ford Motor Co., MD 3179, P.O. Box 2053, Dearborn, MI 48121
G. W. Graham
Affiliation:
Chemical Engineering Department, Ford Motor Co., MD 3179, P.O. Box 2053, Dearborn, MI 48121
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Abstract

The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4iC3H7OH, upon hydrolysis and pyrolysis, furnish single-phase PrOy-ZrO2 materials crystallized in the fluorite structure. These materials can be coated onto high-surface-area γ-alumina powders or deposited onto dense α-alumina coupons in the form of thin films from a solution of parent alkoxides modified with 2,4-pentanedione in THF. The fluorite structure of the PrOy-ZrO2 in the films appears to be thermally stable in air up to 1200°C. Temperature-programmed-reduction (TPR) measurements show that the bulk PrOy-ZrO2 material with a Pr. Zr molar ratio of 1:1 can store and release oxygen while that with a molar ratio of 1:3 cannot.

The precursors play an important role in determining phase composition of the resulting PrOy-ZrO2 material. A mixture of monoclinic and cubic or tetragonal phases was found in PrOy-ZrO2 prepared from a new single-source heterometallic alkoxide, Pr2Zr64-O)2(μ-OAc)6(μ-OiPr)10(OiPr)10, whereas a mixture of cubic and tetragonal phases was present in PrOy-ZrO2 made previously by coprecipitation from aqueous solutions of the metal nitrates.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

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Sol-Gel Precursors and the Oxygen Storage Capacity of PrOy-ZrO2 Materials
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