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KMID : 1024520040130070619
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Journal of the Environmental Sciences
2004 Volume.13 No. 7 p.619 ~ p.626
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Catalytic Combustion of Carbon Particulate over LaMnO₃ Perovskite-Type Oxides
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Lee Yong-Hwa
Lee Gun-Dae
Park Seong-Soo
Hong Seong-Su
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Abstract
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We have studied the catalytic combustion of soot particulates over perovskite-type oxides prepared by malic acid method, The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxide. In addition, the reaction conditions such as temperature and concentration were investigated. The partial substitution of alkali metals into A site in the catalyst, enhanced the catalytic activity in the combustion of carbon particulate and the activity was shown in the order: Cs > K > Na. For the catalysts, the catalytic activity showed the maximum value with x=0.3 but no more increase on the catalytic activity was shown with x > 0.3. For the catalyst, the substitution of Fe or Ni increased the ignition temperature. The ignition temperature decreased with an increase of concentration, however, no more increase in the catalytic activity was shown with concentration > 0.2. The introduction of NO into reactants showed no effect on the catalytic activity.
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KEYWORD
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Combustion, Carbon particulate, Perovskite oxide, NO, Diesel engine exhaust gas, LaMnO₃
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