Hydrogenation of carbon dioxide over alumina supported Fe-K catalysts |
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Authors: | Pyoung Ho Choi Ki-Won Jun Soo-Jae Lee Myuong-Jae Choi Kyu-Wan Lee |
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Affiliation: | (1) Catalysis Research Division, Korea Research Institute of Chemical Technology, PO Box 107, 305-600 Yusong, Taejon, Korea |
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Abstract: | The hydrogenation of CO2 has been studied over Fe/alumina and Fe-K/alumina catalysts. The addition of potassium increases the chemisorption ability of CO2 but decreases that of H2. The catalytic activity test at high pressure (20 atm) reveals that remarkably high activity and selectivity toward light olefins and C2+ hydrocarbons can be achieved with Fe-K/alumina catalysts containing high concentration of K (K/Fe molar ratio = 0.5, 1.0). In the reaction at atmospheric pressure, the highly K-promoted catalysts give much higher CO formation rate than the unpromoted catalyst. It is deduced that the remarkable catalytic properties in the presence of K are attributable to the increase in the ability of CO2 chemisorption and the enhanced activity for CO formation, which is the preceding step of C2+ hydrocarbon formation. |
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Keywords: | carbon dioxide hydrogenation iron-potassium catalyst hydrocarbons |
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