Environmental catalysis and materials

Preparation methods and thermal stability of Ba-Mn-Ce oxide catalyst forNOx-assisted soot oxidation

Xiaodong Wu , Fan Lin , Lei Wang , Duan Weng , Zhou Zhou


Received August 20, 2010,Revised November 15, 2010, Accepted , Available online

Volume 23,2011,Pages 1205-1210

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Manganese oxide-loaded and -doped ceria as well as the corresponding barium-modified oxide catalysts were prepared for soot oxidation in the presence of NOx, and were characterized by using X-ray diffraction, Brunauer-Emmett-Teller and NO temperatureprogrammed oxidation measurements. The activity of catalyst depended strongly on the NO2 production capacity, and the importance of surface nitrates was weakened without heat transfer limitations. The formation of perovskite-type oxides after the high-temperature calcination caused the loss of NOx storage capacity for the Ba-modified catalysts, but did not seem to affect the NO oxidation activity obviously. The addition of barium did not prevent the phase separation of MnOx-CeO2 solid solutions, whereas it inhibited the sintering of oxide crystallites effectively. This, as well as the relatively high surface area, resulted in a small increase in soot oxidation temperature for the thermally aged Ba/Mn-Ce catalyst.

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