Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Study on the Supported Oxide Catalysts for Reducing CO Gas in Automotive Exhaust Gas

자동차 배기가스 중의 CO 가스 제거를 위한 촉매장치의 개발에 관한 연구

  • Kim, Hwan (Dept. of Ceramic Eng., Seoul National University)
  • 김환 (서울공대 요업과)
  • Published : 1980.04.01
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Abstract

Perovskite-type oxide catalysts in the $\textrm{LaMnO}_3$ family were prepared by both freeze drying and precipitation technique, and their catalytic activities with respect to the oxidation of CO with $O_2$ were measured in the composite gases. Freeze drying is a new technique for the prevention of migration of the solutes during drying. Therefore, the corrugated cordierite monolith fabricated with the Ø 1mm stainless steel bar was directly impregnated with nitrate solutions containing the appropriate cations, freeze dried and calcined. Precipitation was done by using $\textrm{(NH_4)}_2\textrm{CO}_3$ but the precipitated catalysts gave lower catalytic than the freeze dried samples due to, in part, relatively high calcining temperature. In this study, freeze dried composition had high catalytic activity, and their apparent activation energy for oxidation of CO was calculated by the rate plots using the data where the percent conversion of CO was less than 20%.

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References

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