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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26663


    Title: CHARACTERIZATION OF UNSUPPORTED COPPER-CHROMIUM CATALYSTS FOR ETHANOL DEHYDROGENATION
    Authors: TU,YJ;CHEN,YW;LI,CP
    Contributors: 化學工程與材料工程學系
    Keywords: TEMPERATURE-PROGRAMMED REDUCTION;METHYL FORMATE;METHANOL DEHYDROGENATION;SURFACE SYNERGISMS;DECOMPOSITION;OXIDES;CYCLOHEXANOL;2-PROPANOL;CHEMISTRY;BEHAVIOR
    Date: 1994
    Issue Date: 2010-06-29 17:33:39 (UTC+8)
    Publisher: 中央大學
    Abstract: The dehydrogenation of ethanol to acetaldehyde has been studied over a series of unsupported copper-chromium catalysts. The results indicate that the sintering occurs in both reduction and dehydrogenation processes. The Cr2O3-promoted copper catalysts prevent sintering in both reduction and reaction processes. The catalyst with Cr/Cu molar ratio of 4/40 has the highest activity and stability. The temperature-programmed reduction results indicate that the good dispersion of Cr2O3 promoter helps to prevent sintering in the reduction process. The catalyst which contains Cu and CuCr2O4 has a lower initial activity and the thermal stability is as poor as the unpromoted one. Cu0 instead of Cu2+ is the active site. The TOFs of promoted catalysts with Cr/Cu= 1/40 to 6/40 are lower than that of unpromoted catalyst, and thus die chromic oxide is not just a textural promoter of Cu. The higher copper surface areas of promoted catalysts easily overcome the loss in TOFs.
    Relation: JOURNAL OF MOLECULAR CATALYSIS
    Appears in Collections:[化學工程與材料工程研究所] 期刊論文

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