Abstract
The CeO 2–K catalysts loaded on porous alumina substrate have been produced by a new route. The potassium halides played an important role on the catalytic activity enhancement of CeO 2 catalyst for soot oxidation. This improvement could partially originate from the catalytic production of CO by the potassium halides. Their effects on the catalytic activity promotion followed the order KF ∼ KCl > KBr > KI and their addition into CeO 2 resulted in the CeO 2–K catalysts with the lowest soot ignition temperatures of about 334, 335, 345 and 362 °C, respectively, at a loose soot/catalyst contact mode. Nevertheless, the CeO 2 with addition of KCl behaved a better catalytic performance. It was also found that the catalysts have a CO 2 absorption capability.
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