A Cu-added Zr-Ce-Sn-Pr-O mixed oxide phase with a high oxygen storage capacity
Tadatoshi Murota; Kosuke Sogawa; Shinya Otsuka-Yao-Matsuo; Takahisa Omata; Tadatoshi Murota; Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka, 565–0871, Japan; Kosuke Sogawa; Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka, 565–0871, Japan; Shinya Otsuka-Yao-Matsuo; Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka, 565–0871, Japan; Takahisa Omata; Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2–1 Yamada-oka, Suita, Osaka, 565–0871, Japan
Журнал:
Journal of Physics: Conference Series
Дата:
2009-05-01
Аннотация:
Phases, oxygen release and absorption behaviour was investigated for Zr-Ce-Sn-Pr-O mixed oxides (Zr<sub>2/8</sub>Ce<sub>x/8</sub>Sn<sub>y/8</sub>Pr<sub>(6-x-y)/8)</sub>O<sub>2-z</sub> (x=1.5, 4.5, y=0.5) together with the effect of Cu addition. Major phases of Sn-added samples were similar to those of Sn-free (Zr<sub>2/8</sub>Ce<sub>x/8</sub>Pr<sub>(6-x)/8)</sub>O<sub>2-z</sub> phases, that is, CaF<sub>2</sub>-like λ and C phases for Pr-rich and Ce-rich compounds, respectively. All samples contained a SnO<sub>2</sub> or a Sn phase. When Cu was added, repetitive oxidation and reduction appeared to promote the fine dissolution of Sn and Cu through bulk phases. OSC values of both (Zr<sub>2/8</sub>Ce<sub>1.5/8</sub>Sn<sub>0.5/8</sub>Pr<sub>4/8)</sub>O<sub>2-z</sub> and (Zr<sub>2/8</sub>Ce<sub>4.5/8</sub>Sn<sub>0.5/8</sub>Pr<sub>1/8)</sub>O<sub>2-z</sub> were larger than those of the corresponding Sn-free samples. For the Ce-rich sample, Cu addition improved both the OSC value and its on-set temperature.
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