Direct decomposition of NO into N2 and O2 on SrFe0.7Mg0.3O3 perovskite oxide

Hideharu Iwakuni, Yusuke Shinmyou, Hiroshige Matsumoto, Tatsumi Ishihara

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Abstract

NO direct decomposition on doped SrFeO3 perovskite oxide was investigated. The ability of SrFeO3 for direct decomposition of NO is strongly affected by the dopant in Fe sites. Among the examined dopants and compositions, the highest yield of N2 was achieved on SrFe 0.7Mg0.3O3. When SrFe0.7Mg 0.3O3 was loaded with Pt, the N2 yield further improved, and the light-off temperature fell by 100K. On this catalyst, the yields of N2 and O2 were 56 and 35%, respectively, at 1123 K. On the Pt-loaded SrFe0.7Mg0.3O3 catalyst, the NO decomposition rate increased with increase in the NO partial pressure with PNO1.31. The presence of oxygen slightly decreased the N2 yield with Poo2-0.12 Therefore, the effect of oxygen poisoning on NO decomposition upon Pt-loaded SrFe0.7Mg0.3O3 is small. From the result of O2-TPD, Pt loading possibly weakens the adsorption strength of surface oxygen and enhances NO adsorption. In summary, this study shows that the substitution of Fe with lower valence cation in SrFeO3 and also loading a small amount of Pt are highly effective for increasing the NO decomposition activity.

Original languageEnglish
Pages (from-to)2039-2046
Number of pages8
JournalBulletin of the Chemical Society of Japan
Volume80
Issue number10
DOIs
Publication statusPublished - Dec 1 2007

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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