TY - JOUR
T1 - Direct decomposition of NO into N2 and O2 on SrFe0.7Mg0.3O3 perovskite oxide
AU - Iwakuni, Hideharu
AU - Shinmyou, Yusuke
AU - Matsumoto, Hiroshige
AU - Ishihara, Tatsumi
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
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U2 - 10.1246/bcsj.80.2039
DO - 10.1246/bcsj.80.2039
M3 - Article
AN - SCOPUS:42049099193
SN - 0009-2673
VL - 80
SP - 2039
EP - 2046
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 10
ER -