Soot combustion activity of NO x -sorbing Cs–MnO x –CeO 2 catalysts

Activities of Cs-loaded MnO x –CeO 2 for combustion of model diesel soot (carbon black) and sorptive NO uptake have been studied. MnO x –CeO 2 is a pseudo-solid solution having redox properties favorable for soot oxidation. The addition of Cs not only lowered the temperature of soot ignition ( T i),...

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Published inCatalysis communications Vol. 8; no. 12; pp. 2176 - 2180
Main Authors Ito, Kazuhiro, Kishikawa, Kouji, Watajima, Akihisa, Ikeue, Keita, Machida, Masato
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2007
Subjects
Cerium
Cesium
Diesel soot combustion
Manganese
NO x adsorption
NO x adsorption
Cerium
Cesium
Diesel soot combustion
Manganese
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Summary:Activities of Cs-loaded MnO x –CeO 2 for combustion of model diesel soot (carbon black) and sorptive NO uptake have been studied. MnO x –CeO 2 is a pseudo-solid solution having redox properties favorable for soot oxidation. The addition of Cs not only lowered the temperature of soot ignition ( T i), but also increased oxidative NO x adsorption to form nitrate on the surface. Soot ignition over Cs–MnO x –CeO 2 was further promoted in a stream of NO/O 2, presumably because nitrate on the surface plays a role of an oxidizing agent. Soot ignition started just before sharp desorption of NO x , suggesting that adsorbed nitrate species would directly interact with soot.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.04.036