Direct Decomposition of NO into N2 and O2 on SrFe0.7Mg0.3O3 Perovskite Oxide.
Direct Decomposition of NO into N2 and O2 on SrFe0.7Mg0.3O3 Perovskite Oxide.
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NO 在 SrFe0.7Mg0.3O3 钙钛矿氧化物上直接分解为 N2 和 O2。
DOI：
10.1002/chin.200752019
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Ishihara
中科院分区：
文献类型：
--
作者：
H. Iwakuni;Yusuke Shinmyou;H. Matsumoto;T. Ishihara
研究了NO在掺杂SrFeO 3钙钛矿氧化物上的直接分解. SrFeO 3直接分解NO的能力受Fe位掺杂的影响很大。在所研究的掺杂剂和组合物中，N2的产率最高的是在SrFe0.7Mg0.3O3上实现的。当SrFe0.7Mg0.3O3负载Pt时，N2产率进一步提高，起燃温度下降了100 K。在该催化剂上，1123 K时N2和O2的产率分别为56%和35%。在Pt负载的SrFe0.7Mg0.3O3催化剂上，NO分解率随NO分压的增加而增加，P NO为1.31。氧的存在使N2的产率略有下降，PO 2为-0.12。因此，氧中毒对载铂SrFe0.7Mg0.3O3催化剂分解NO的影响不大。O2-TPD结果表明，Pt的负载可能减弱了表面氧的吸附强度，增强了NO的吸附。总之，本研究表明，在SrFeO 3中用低价阳离子取代Fe并负载少量Pt对于提高NO分解活性是非常有效的。
NO direct decomposition on doped SrFeO 3 perovskite oxide was investigated. The ability of SrFeO 3 for direct decomposition of NO is strongly affected by the dopant in Fe sites. Among the examined dopants and compositions, the highest yield of N 2 was achieved on Srfe 0.7 Mg 0.3 O 3 . When SrFe 0.7 Mg 0.3 O 3 was loaded with Pt, the N 2 yield further improved, and the light-off temperature fell by 100K. On this catalyst, the yields of N 2 and O 2 were 56 and 35%, respectively, at 1123 K. On the Pt-loaded SrFe 0.7 Mg 0.3 O 3 catalyst, the NO decomposition rate increased with increase in the NO partial pressure with P NO 1.31 . The presence of oxygen slightly decreased the N 2 yield with Po 2 -0.12 Therefore, the effect of oxygen poisoning on NO decomposition upon Pt-loaded SrFe 0.7 Mg 0.3 O 3 is small. From the result of O 2 -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 SrFeO 3 and also loading a small amount of Pt are highly effective for increasing the NO decomposition activity.