Catalytic Combustion of Carbon Particulate over LaMnO3 Perovskite-Type Oxides

LaMnO3형 페롭스카이트 산화물에서 입자상물질의 촉매연소반응

  • 이용화 (부경대학교 응용화학공학부) ;
  • 이근대 (부경대학교 응용화학공학부) ;
  • 박성수 (부경대학교 응용화학공학부) ;
  • 홍성수 (부경대학교 응용화학공학부)
  • Published : 2004.07.01


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 $O_2$ concentration were investigated. The partial substitution of alkali metals into A site in the $LaMnO_3$ catalyst, enhanced the catalytic activity in the combustion of carbon particulate and the activity was shown in the order: Cs > K > Na. For the $La_{1-x}Cs_{x}MnO_{3}$ 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 $La_{0.8}Cs_{0.2}MnO_{3}$ catalyst, the substitution of Fe or Ni increased the ignition temperature. The ignition temperature decreased with an increase of $O_2$ concentration, however, no more increase in the catalytic activity was shown with $O_2$ concentration > 0.2. The introduction of NO into reactants showed no effect on the catalytic activity.


Combustion;Carbon particulate;Perovskite oxide;$LaMnO_3$;NO;Diesel engine exhaust gas


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