Low-temperature oxidation of ethanol to acetaldehyde over Mo-based catalysts

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Abstract
The research and development of the green synthesis route of chemicals has become the focus of research in academia and industry. At present, the highly efficient oxidation of ethanol to acetaldehyde over non-precious metal catalysts under mild conditions is most promising, but remains a big challenge. Herein, the Mo–Sn oxide catalyst was designed to successfully realize low-temperature oxidation of ethanol to acetaldehyde, achieving an acetaldehyde selectivity of 89.3%, and ethanol conversion of 58.9% at 190 °C without COx formation. From the deep correlation of characterization and activity results, the weakened MoO bond and the enhanced mobility of lattice oxygen play crucial roles in the oxidation of Cα–H in the CH3CH2O* at lower temperatures. An optimal Mo/Sn ratio possessing multiple active centers can obviously promote the adsorption and dissociation of ethanol into CH3CH2O*. Furthermore, the reduced amount of medium-strong acid inhibited the formation of ethyl acetate as a byproduct.
Funding Information
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences (2014155)
  • National Natural Science Foundation of China (22172187)

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