Selective oxidation of glycerol to dihydroxyacetone over Au/Cu-Co catalysts
Dihydroxyacetone(DHA)is a value-added product of selective oxidation of glycerol which plays a very important role in agriculture,pharmacy and other fields.In this paper,CuO and Cu-Co metal oxide composites prepared by sol-gel and hard template method were used as support for Au catalysts.The catalytic performance for oxidation of glycerol to dihydroxyacetone under base-free condition was studied.The activity evaluation results indicated that the Au/Cu0.75Co0.25 catalyst had the highest catalytic activity and exhibited good selectivity,with glycerol conversion of 69.0%and DHA selectivity of 99.7%.The higher activity of the catalyst may be attributed to the fact that the addition of Co enhanced the interaction between Au and the support,which made the electron density more easily shifted toward Au to form more Au0 species and improved the particle dispersion of Au.The increase of Au0 favored the formation of more lattice oxygen species Olatt,which enhanced the activation and conversion of glycerol,and the smaller particle size of Au also contributed the adsorption and activation of glycerol on the catalyst,thus promoting DHA yield.
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