The relation between pre-treatment of promoted copper catalysts and their activity in hydrogenation reactions
- Univ. of Amsterdam (Netherlands)
The influence of reduction temperature on promoted and unprompted silica supported copper catalysts in ester hydrogenolysis and methanol synthesis from CO/H{sub 2} and CO{sub 2}/H{sub 2} mixtures was investigated. Results on ester hydrogenolysis using model methyl acetate feed could be confirmed with a more realistic feed such as methyl palmitate. Zn and Mn proved effective promoters in ester hydrogenolysis. After high temperature reduction of promoted catalysts a remarkable increase in activity was observed for ail reactions studied. In ester hydrogenolysis this effect renders the Cu/Zn/SiO{sub 2} catalyst superior to a commercial Cu/Cr reference. The effect of high temperature reduction is explained by a previously proposed model involving formation of epitaxial two-dimensional platelets of reduced copper on top of a mixed oxide. These sites are able to activate CO towards CH{sub 3}OH formation, in contrast to unprompted Cu/SiO{sub 2} or low temperature reduced Cu/Zn/SiO{sub 2}.
- OSTI ID:
- 468029
- Report Number(s):
- CONF-960652--
- Country of Publication:
- United States
- Language:
- English
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