The effect of cyclic red-ox treatments on the reducibility and durability of properties of YO1.5-(CeO2)-PrOx-ZrO2 materials

Single-phase cubic fluorite-type YO1.5(10)-PrOx(30)-ZrO2 and YO1.5(10)-CeO2(15)-PrOx(15)-ZrO2 solids were obtained by coprecipitation technique. Temperature-programmed reduction of these materials was carried out in the temperature ranges 293-1220 and 293-1470 K. The reducibility of Pr-containing sa...

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Published in:Materials letters 2002-02, Vol.52 (4-5), p.283-288
Main Authors: IKRYANNIKOVA, Larisa N, MARKARYAN, Goar L, KOSTYUK, Boris G, LUNINA, Elena V, SINEV, Mikhail Yu
Format: Article
Language:English
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Summary:Single-phase cubic fluorite-type YO1.5(10)-PrOx(30)-ZrO2 and YO1.5(10)-CeO2(15)-PrOx(15)-ZrO2 solids were obtained by coprecipitation technique. Temperature-programmed reduction of these materials was carried out in the temperature ranges 293-1220 and 293-1470 K. The reducibility of Pr-containing samples was compared with YO1.5-CeO2-ZrO2. It was found that the substitution of cerium by praseodymium, partial or total, decreases the hydrogen uptake during reduction. The reproducibility of red-ox properties of praseodymium containing samples in sequential cycles also decreases in comparison with YO1.5-CeO2-ZrO2 material. The gradual substitution of Ce by Pr leads to the progressive decrease of specific surface area and reduces its thermostability, while the cubic structure retains during heating in hydrogen up to 1470 K. 14 refs.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(01)00407-4