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- W2890741665 abstract "In this work, amorphous copper-chromium catalysts with different Cu/Cr molar ratios have been prepared by a sol-gel method and were used in the oxidation of cyclohexane to KA-oil. The catalysts have been characterized by a variety of analytical techniques including XRD, XPS, Raman, FT-IR, BET, TEM and SEM. XRD results confirmed that the formation of amorphous structure. The XPS and Raman results indicated that most of Cu species existed in well-dispersed tetrahedral coordination before calcination. After calcination, the tetrahedrally coordinated Cu ions are transformed into octahedral coordination and the activity of catalyst is significantly reduced. The results show that the tetrahedrally coordinated Cu ions play the synergistic catalytic role with Cr ions. Interestingly, oxidation of cyclohexane is more inclined to produce cyclohexanol with uncalcined catalyst due to the presence of the tetrahedrally coordinated Cu ions; however, the appearance of surface lattice oxygen makes the reaction more conducive to cyclohexanone after calcination. After optimizing conditions, Cu-Cr oxide catalyst with the molar ratio 1:1 shows the highest activity, which obtains 62.2% yield and 92.4% selectivity for KA-oil using H2O2 as oxygen source." @default.
- W2890741665 created "2018-09-27" @default.
- W2890741665 creator A5030445732 @default.
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- W2890741665 date "2018-12-01" @default.
- W2890741665 modified "2023-10-16" @default.
- W2890741665 title "Preparation of amorphous copper - chromium oxides catalysts for selective oxidation of cyclohexane" @default.
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- W2890741665 doi "https://doi.org/10.1016/j.mcat.2018.09.007" @default.
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