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페롭스카이트형 산화물 촉매에 의한 프로필렌의 완전산화반응

Total Oxidation of Propylene over Perovskite-type Oxide Catalysts

HWAHAK KONGHAK, December 1988, 26(6), 641-648(8), NONE
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Abstract

비금속 촉매인 페롭스카이트형 산화물(ABO3)을 제조하여, 자동차 배기가스중에 포함되어 있는 탄화수소중의 하나인 프로필렌에 대한 완전산화반응 촉매로 이용하였다. 촉매는 고온소성법에 의하여 제조하였으며, 제조된 촉매는 소성온도가 낮아짐에 따라 촉매의 표면적이 크고 활성이 좋았다. LaCoO3와 LaMnO3 촉매에 있어서 A-점이온의 일부가 적당량의 Sr로 치환됨에 따라 활성이 향상되었으며, LaMnO3 보다는 LaCoO3의 활성이 더 좋았다. 이는 촉매의 환원능과 밀접한 관계가 있음을 알았다. 미량의 백금을 doping시킨 촉매는 원촉매보다 활성이 좋았고, SO2에 대한 피독에도 강하였다. 미분형반응기를 이용하여 반응차수를 결정하였으며, 반응온도가 증가함에 따라 프로필렌의 반응차수는 증가한 반면, 산소의 반응차수는 감소하였다.
Perovskite-type oxides(ABO3) were prepared and used for the complete oxidation of propylene which is one of hydrocarbons in the automobile exhaust gas. Perovskite catalysts were prepared at different calcination temperatures, and the lower calcination temperature gave the higher activity and surface area of the catalyst. In the case of LaCoO3 and LaMnO3, substitution of proper amount of Sr into A-site enhanced the activity, and Co showed higher activity than Mn for B-site. The results were explained with the reducibility of the catalysts. The catalysts doped with the trace amount of Pt showed higher activity and better resistance to sulfur poisoning by SO2 than those without Pt. The reaction orders were determined, and the orders with respect to propylene and oxygen were increased and decreased with the increase of reaction temperature, respectively.

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