Abstract
Abstract Potassium nitrate catalysts supported on different oxides (CeO 2 , Ce 0.5 Zr 0.5 O 2 and ZrO 2 ) were prepared for diesel soot combustion. The ageing treatment was performed at 800 °C for 24 h and the catalytic activity was evaluated by a temperature-programmed oxidation technique. The results demonstrated that, compared with CeO 2 and ZrO 2 , Ce 0.5 Zr 0.5 O 2 presented good redox properties, a high surface area and available potassium-holding capacity at an elevated temperature. For aged K/Ce 0.5 Zr 0.5 O 2 , the combustion temperature of soot particle was 359 °C under tight contact conditions and 455 °C under loose contact conditions. Thus, ceria–zirconia mixed oxides were considered as good candidate supports for diesel soot oxidation catalysis.
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