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Kinetic and structural studies of oxygen availability of the mixed oxides Pr1–xMxOy (M = Ce, Zr)

Published online by Cambridge University Press:  31 January 2011

M. Yu. Sinev ,
G. W. Graham ,
L. P. Haack  and
M. Shelef
M. Yu. Sinev
Affiliation:
Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow, 117334, Russia
G. W. Graham
Affiliation:
Ford Research Laboratory, MD3179/SRL, P.O. Box 2053, Dearborn, Michigan 48121–2053
L. P. Haack
Affiliation:
Ford Research Laboratory, MD3179/SRL, P.O. Box 2053, Dearborn, Michigan 48121–2053
M. Shelef
Affiliation:
Ford Research Laboratory, MD3179/SRL, P.O. Box 2053, Dearborn, Michigan 48121–2053
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Abstract

One composition of Pr–Ce mixed oxide and a range of compositions of Pr–Zr mixed oxide were prepared by coprecipitation methods and characterized by x-ray powder diffraction, thermogravimetric analysis, and x-ray photoelectron spectroscopy. Based on phases formed, the PrOy—ZrO2 system in an oxygen-containing atmosphere at moderate temperatures (up to 800–1000 °C) is analogous to that of CeO2–ZrO2. Addition of either Ce or Zr to pure Pr oxide affects both the total amount of oxygen that can be reversibly exchanged between oxide and gas phase and the kinetics of the redox processes. Ce dramatically increases the amount (per Pr atom) and lowers the temperature of exchange, Zr slightly decreases the amount and also lowers the temperature of exchange, and both modifiers speed up the rate. These observations are rationalized in terms of bulk and surface structural features of the mixed oxides.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 8 , August 1996 , pp. 1960 - 1971
Copyright
Copyright © Materials Research Society 1996

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