Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-28T02:02:27.219Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  10 February 2011

C. K. Narula ,
K. L. Taylor ,
L. P. Haack ,
L. F. Allard ,
A. Datye ,
M. Yu. Sinev ,
M. Shelef ,
R. W. McCabe ,
W. Chun  and
G. W. Graham
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
Get access

Abstract

The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4•iC3H7OH, 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, Pr2Zr6(μ4-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
Information
MRS Online Proceedings Library (OPL) , Volume 497: Symposium Z – Recent Advances in Catalytic Materials , 1997 , 15
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Narula, C.K., Allison, J.E., Bauer, D.R. and Gandhi, H.S., Chem. Mater. 8, p. 984 (1996).Google Scholar
Logan, A.D. and Shelef, M., J. Mater. Res. 9, p. 468 (1994).Google Scholar
Bradley, D.C., Mehrotra, R.C. and Gaur, D.P., Metal Alkoxides, Academic Press, London, 1978.Google Scholar
Krasil'nikov, M.D., Vinokurov, I.V., Nikitina, S.D., Fiz. Khim. Electrokhim. Rasplavl. Tverd. Electrolitov, Tezisy Dokl. Vses. Konf. Fiz. Khim. Ionnykh Rasplanov Tverd. Electrolitov 3, p. 123 (1979).Google Scholar
Sinev, M. Yu., Graham, G.W., Haack, L.P., and Shelef, M., J. Mater. Res. 11, p. 1960 (1996).10.1557/JMR.1996.0247Google Scholar
Trovarelli, A., Zamar, R., Llorca, J., de Leitenburg, C., Dolcetti, G., and Kiss, J.T., J. Catal. 169, p. 490 (1997).10.1006/jcat.1997.1705Google Scholar
Turova, N. Ya., Kozlova, N.I. and Novoselova, A.V., Russ. J. Inorg. Chem. 25, p. 1788 (1980).Google Scholar
Daneiele, S., Hubert-Pfalzgraf, L.G., Daran, J.C. and Toscano, R.A., Polyhedron 12, p. 2091 (1993).10.1016/S0277-5387(00)84370-3Google Scholar