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HWAHAK KONGHAK,
Vol.28, No.3, 271-278, 1990
Vol.28, No.3, 271-278, 1990
n-Hexane개질반응을 위한 HY 제올라이트 담지 Pt 및 Pt-Re이원금속 촉매의 활성도, 선택도 및 안정성에 관한 연구
Activity, Selectivity and Stability of pt and Pt-Re Bimetallic Catalysts Supported on HY Zeolite in n-Hexane Reforming Reaction
HY 제올라이트를 담체로 하는 Pt 및 Pt-Re 이원금속 촉매를 만들어 n-hexane의 개질반응에서 촉매 활성, 선택성 및 안정성을 비교하였다. H2/n-hexane의 몰비는 5로 하였으며 반응온도와 소성온도를 각각 300-500℃로 변화시키면서 촉매의 특성을 검토하였다. HY 제올라이트를 사용하는 경우에 알루미나 담체를 사용한 경우보다 C6 isomer에 대한 선택도가 2배 정도 크고 소성온도에 따라서 활성과 선택도가 변하며, Pt/HY 촉매보다 Pt-Re/HY 촉매가 hydrogenolysis 반응에 대해서 활성이 높았다. Re/HY는 수소를 흡착하지 않았으며 Pt(0.5)Re(0.5)/HY의 수소흡착량(H/M)는 Pt(0.5)/HY의 H/M값의 1/3 정도로 감소하였다. 이러한 결과들은 Pt-Re의 이원금속 cluster가 HY zeolite 담체위에 형성되었음을 나타낸다. Pt에 Re을 첨가함으로써 촉매의 비활성화 속도가 반으로 감소하였으며 Pt 촉매에 비해 이성화물에 대한 선택도는 감소하고 분해반응에 대한 선택도는 증가하였다.
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Pt and Pt-Re bimetallic clusters supported on HY zeolite were prepared and their catalytic activities, se-lectivities and stabilities were evaluated in the n-hexane reforming reaction. The mole ratio of H2/n-hexane was 5 and the reaction temperature and calcination temperature were varied in the range of temperature between 300 and 500℃, respectively. The selectivity of the HY zeolite supported catalyst towards C6 isomers was 2 times higher than that of the alumina supported catalyst. The catalytic activity and selectivity of Pt-Re/HY are dependent on the temperature of calcination and the higher selectivity to C1-C5 products was obtained with Pt-Re/HY catalyst. The value of hydrogen chemisorption(H/W)of Re/HY is negligible and H/M value of Pt(0.5)Re(0.5)/HY is about one over third of that of Pt(0.5)/HY. These results indicate that Pt-Re bimetallic clusters were formed on HY zeolite. The addition of Re on Pt caused the deactivation rate to be decreased to one half of deactivation rate of Pt/HY catalyst. The selectivity of Pt-Re/HY towards C6 isomers is lower than that of Pt/HY, while the selectivity to cracking products is higher than that of Pt/HY.
Pt and Pt-Re bimetallic clusters supported on HY zeolite were prepared and their catalytic activities, se-lectivities and stabilities were evaluated in the n-hexane reforming reaction. The mole ratio of H2/n-hexane was 5 and the reaction temperature and calcination temperature were varied in the range of temperature between 300 and 500℃, respectively. The selectivity of the HY zeolite supported catalyst towards C6 isomers was 2 times higher than that of the alumina supported catalyst. The catalytic activity and selectivity of Pt-Re/HY are dependent on the temperature of calcination and the higher selectivity to C1-C5 products was obtained with Pt-Re/HY catalyst. The value of hydrogen chemisorption(H/W)of Re/HY is negligible and H/M value of Pt(0.5)Re(0.5)/HY is about one over third of that of Pt(0.5)/HY. These results indicate that Pt-Re bimetallic clusters were formed on HY zeolite. The addition of Re on Pt caused the deactivation rate to be decreased to one half of deactivation rate of Pt/HY catalyst. The selectivity of Pt-Re/HY towards C6 isomers is lower than that of Pt/HY, while the selectivity to cracking products is higher than that of Pt/HY.
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