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

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.