Abstract
The copper chromite catalyst is used in the reduction of fatty esters into higher alcohols. In this reaction the copper chromite catalyst, CuO/CuCr2O4 * , is reduced to Cu/Cr2O3 * by hydrogen. In this reduction a part of the water formed is adsorbed onto the catalyst and gives Cu/Cr2O3. (H2O)ad. The other part of the catalyst remains as Cu/Cr2O3, which is at least one form of the true active catalyst. If carbon monoxide is added to this system, the water-gas reaction takes place, and results in Cu/Cr2O3. (CO2)ad. By evacuation this becomes Cu/Cr2O3, the activity of which is larger than that of the originally formed Cu/Cr2O3. Externally added water behaves similarly with that formed by the reduction of the catalyst. Reduction of CuO/CuCr2O4 by carbon monoxide also gives Cu/Cr2O3, but the treatment of the reduced catalyst with CO and water does not increase the activity of the catalyst.
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