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n-Hexane 개질반응을 위한 알루미나 담지 Pt-Re 이원 금속촉매의 활성도, 선택도 및 안정성에 관한 연구
Activity, Selectiivity and Stability of Pt-Re Bimetallic Catalysts Supported on Υ-Alumina in n-Hexane Reforming Reaction
HWAHAK KONGHAK, December 1989, 27(6), 729-736(8), NONE
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Abstract
알루미나 담지 Pt-Re 이원 촉매를 사용하여 n-hexane 개질반응에서 촉매의 활성도, 선택도 및 안정성 연구를 하였다. 반응온도, 소성온도 및 환원온도는 각각 300-500℃ 및 500℃로 하였다. Pt 촉매의 담지량은 0.5 및 1wt%로 하였고, Re촉매는 담지량을 0.5wt%로 하였다. Pt-Re 이원 촉매는 H2PtCl6와 HReO4 수용액을 동시에 함침시켜 Pt와 Re 함량이 각각 0.5, 0.25wt% 및 0.5, 0.5wt%가 되도록 제조 하였다. Pt/alumina 촉매의 경우 Pt 담지량이 증가하면 벤젠의 선택도는 증가하나 C6 이성화물의 수율은 감소하였다. 반응온도가 400℃일 때 Pt-Re/alumina는 Pt/alumina 보다 hydrogenolysis 반응을 촉진시켜 C1-C5 화합물의 선택도가 커지나 반응온도가 450℃ 이상에서는 감소하며 반면에 벤젠의 수율은 증가하였다. Pt-Re 촉매 제조시 소성온도에 따라 활성과 선택도가 변화하였으며 Re의 첨가에 따라 활성도는 증가하였으며 비활성화 속도는 감소하였다.
The activities, selectivities and stabilities of bimetallic Pt-Re clusters supported on γ-alumina were evaluated in the n-hexane reforming reaction. Reaction temperature and calcination temperatures were varied at 300-500℃ and 400-500℃, respectively. Reduction was performed at 500℃. Pt-Re/alumina catalysts were prepared by coimpregnating the aqueous solution of H2PtCl6 and HReO4. When the amount of Pt supported on alumina increased, the selectivity towards benzene increased, but the selectivity towards C6 isomers decreased. Pt-Re/alumina was more active in the hydrogenolysis reaction at 400℃ than Pt/alumina, resulting in the higher selectivity towards C1-C5 com-pound. However, Pt-Re/alumina produced less C1-C5 compound and more benzene above 450℃ than Pt/alumina. The ativities and selectivities of Pt-Re/alumina were varied with different calcination temperatures, indicating that the for-mation of Pt-Re bimetallic cluster is dependent on the calcination temperature. The addition of Re on Pt improved the maintenance of activity by decreasing the deactivation rate.
