Hydrothermal preparation of Cu-ZnO catalyst for catalytic hydrogenation of ethyl acetate
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    Abstract:

    Cu-ZnO catalysts with different Cu-Zn molar ratios (n=1/4, 3/7, 2/3, 1 and 3/2, corresponding to copper mole fraction of 0.2, 0.3, 0.4, 0.5 and 0.6) were prepared by hydrothermal method using zinc nitrate hexahydrate, copper nitrate trihydrate and urea. The structure of Cu-ZnO catalysts was characterized by SEM, XRD, H2-TPR and BET. The effects of copper mole fraction on the morphology of catalyst and the hydrogenation of ethyl acetate were studied. The results show that the Cu-ZnO catalysts prepared by hydrothermal method are all self-assembled nanoflower structures. When the copper mole fraction is 0.4, the thickness of the nanosheet is less than 50 nm, the diameter of the nanoflower is about 10μm, and the conversion rate of ethyl acetate is the highest. When the mole fraction of copper is too high or too low, the activity decreases. It was found that the binding strength of Cu and ZnO was moderate and the active sites were well dispersed in the catalyst with copper mole fraction of 0.4. The effects of hydrothermal conditions on the catalytic performance were investigated. The conversion of ethyl acetate reached 94% under the optimal hydrothermal conditions〔hydrogenation reaction conditions: 220℃, 3Mpa, mass ratio of hydrogen to ethyl acetate: 20, space-time velocity of liquid: 2.0g ester (g catalyst•h)〕. The conversion of ethyl acetate remained above 92% in the stability test of catalyst (300h).

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History
  • Received:November 05,2020
  • Revised:December 24,2020
  • Adopted:December 25,2020
  • Online: March 01,2021
  • Published: