Formation and Conversion of Surface Compounds upon Interaction of Ethanol with Cu/CeO2 Catalyst According to in situ IR Spectroscopy

In the conditions of ethanol conversion on the surface of a 5%Cu/CeO 2 catalyst, the method of in situ IR spectroscopy reveals ethoxy groups, acetate and formiate complexes, and consolidation products. Acetaldehyde, acetone, croton aldehyde, butadiene, hydrogen, CO, and CO 2 are observed in the reac...

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Bibliographic Details
Published in:Kinetics and catalysis 2018-05, Vol.59 (3), p.320-327
Main Authors: Matyshak, V. A., Sil’chenkova, O. N., Bychkov, V. Yu, Tyulenin, Yu. P.
Format: Article
Language:English
Subjects:
Acetaldehyde
Acetone
Butadiene
Carbon dioxide
Carbon monoxide
Catalysis
Catalysts
Cerium oxides
Chemistry
Chemistry and Materials Science
Consolidation
Conversion
Copper
Ethanol
Hydrogen
Infrared spectroscopy
Physical Chemistry
Reaction products
Spectrum analysis
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Summary:In the conditions of ethanol conversion on the surface of a 5%Cu/CeO 2 catalyst, the method of in situ IR spectroscopy reveals ethoxy groups, acetate and formiate complexes, and consolidation products. Acetaldehyde, acetone, croton aldehyde, butadiene, hydrogen, CO, and CO 2 are observed in the reaction products. As the temperature of the experiment increases, the concentration of acetaldehyde passes through a maximum at T = 250°C. This product is formed due to the interaction of ethoxy and hydroxyl surface groups. The concentration of acetone, croton aldehyde, and butadiene also passes through a maximum in the 350–400°C range. These products are associated with the decomposition of the consolidation products. The concentration of hydrogen, CO and CO 2 steadily increases with temperature and only these reaction products are left at T > 400°C. A mechanism of hydrogen formation based on the conversion of the highest temperature formiate surface complex is discussed.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158418030114