Methanol Synthesis on Potassium-Modified Cu(100) from CO + H2 and CO + CO2 + H2 |
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Authors: | Mette Maack Henriette Friis-Jensen Susanne Sckerl Jane H. Larsen Ib Chorkendorff |
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Affiliation: | (1) Interdisciplinary Research Center for Catalysis (ICAT), Department of Physics and Department of Chemical Engineering,Technical University of Denmark, DK-2800 Kgs Lyngby, Denmark |
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Abstract: | Methanol cannot be produced from CO + H2 on a clean copper surface, but a promotional effect of potassium on methanol synthesis from mixtures of CO + H2 and CO + CO2 + H2 at a total pressure of 1.5 bar on a Cu(100) surface is shown in this work. The experiments are performed in a UHV chamber connected with a high-pressure cell (HPC). The methanol produced is measured with a gas chromatograph and the surface is characterized with surface science techniques. The results show that potassium is a promoter for the methanol synthesis from CO + H2, and that the influence of CO2 is negligible. Investigation of the post-reaction surface with TPD indicates that potassium carbonate is present and plays an important role. The activation energy is determined as 42 ± 3 kJ/mol for methanol synthesis on K/Cu(100) from CO + H2. |
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Keywords: | methanol synthesis potassium Cu(100) single crystal surface reactions |
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