Abstract
Single-phase cubic fluorite-type YO 1.5(10)–PrO x (30)–ZrO 2 and YO 1.5(10)–CeO 2(15)–PrO x (15)–ZrO 2 solids were obtained by coprecipitation technique. Temperature-programmed reduction of these materials has been carried out in the different temperature ranges (293–1220 and 293–1470 K). The reducibility of Pr-containing samples was compared with YO 1.5–CeO 2–ZrO 2. 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 YO 1.5–CeO 2–ZrO 2 material. The gradual substitution of Ce by Pr leads to the progressive decrease of specific surface area ( S sp) and reduces its thermostability, while the cubic structure retains during heating in hydrogen up to 1470 K.
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