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

摘要

In the conditions of ethanol conversion on the surface of a 5%Cu/CeO2 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 CO2 are observed in the reaction products. As the temperature of the experiment increases, the concentration of acetaldehyde passes through a maximum at T = 250A degrees 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 350-400A degrees C range. These products are associated with the decomposition of the consolidation products. The concentration of hydrogen, CO and CO2 steadily increases with temperature and only these reaction products are left at T 400A degrees C. A mechanism of hydrogen formation based on the conversion of the highest temperature formiate surface complex is discussed.