Ethoxy Groups on ZrO2, CuO, and CuO/ZrO2 Studied by IR Spectroscopy

The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were followed by IR spectroscopy. The reaction of ethanol with terminal Zr-OH groups leads to the formation of monodendate ethoxy groups (type I), whereas the reaction of ethanol with tribridged Zr-OH...

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Published inMolecules (Basel, Switzerland) Vol. 27; no. 15; p. 4790
Main Authors Podobiński, Jerzy, Śliwa, Michał, Datka, Jerzy
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 26.07.2022
MDPI
Subjects
Acetaldehyde
Acetic acid
Alcohol
Copper oxides
CuO
CuO/ZrO2
Decomposition
Decomposition reactions
Ethanol
ethoxy groups
Hydrogen
Infrared spectroscopy
IR spectroscopy
Mixed oxides
Spectrum analysis
Zirconium dioxide
ZrO2
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Summary:The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were followed by IR spectroscopy. The reaction of ethanol with terminal Zr-OH groups leads to the formation of monodendate ethoxy groups (type I), whereas the reaction of ethanol with tribridged Zr-OH grups results in the formation of bidendate ethoxyls (type II). In both cases, water is produced. Ethoxy groups of type II were also formed on CuO. The type of the surface species detected after interaction of ethanol with CuO/ZrO2 was the same as detected for both oxides (i.e., ZrO2 and CuO) separately. This suggests that no new phase was formed in the mixed oxide system. At higher temperatures, ethoxy groups were oxidized forming acetate ions. Gaseous ethanol present in the cell was oxidized to acetaldehyde without the intermediacy of ethoxy groups.
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ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27154790