Abstract
The catalytic combustion of diesel soot was studied in the presence of fresh and aged catalysts: Co/Al 2O 3, KNO 3/Al 2O 3 and Co/KNO 3/Al 2O 3. The catalysts were prepared by impregnation using nitrate solutions. The catalysts were characterized by X-ray diffraction, thermal programmed reduction, vibrational spectroscopy and X-ray photoelectron spectroscopy. Fresh and aged catalysts present high activity in presence of O 2 and O 2/NO. The values of the combustion temperature decrease more than 200 °C with respect to that observed in the process without catalysis. The activity is associated with the presence of KNO 3 and the role of this salt can be attributed to the contribution of NO 3 −/NO 2 − redox cycle.
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