Study on Preparation and Glycerol Selective Catalytic Oxidation Activity of Supported AuCu Nanoparticle Catalysts
Biodiesel is considered to be a perfect alternative to petroleum and diesel,and its production process produces a large amount of glycerin,a by-product,which is an urgent problem to be solved.In order to improve the utilization rate of glycerol,Au,Au1Cu3,Au1Cu1 and Au3Cu1 nanoparticles with different molar ratios were prepared by sodium borohydride reduction method,and these nanoparticles were loaded on different supports(Al2O3,TiO2,SiO2 and CeO2),respectively.The selective catalytic oxidation of glycerol to 2-hydroxyacetone(DHA)was used as a probe reaction to investigate the catalytic performance of different catalysts.The results showed that AuCu/Al2O3 exhibited the best catalytic performance,with a glycerol conversion rate and DHA selectivity of 30％and 60％,respectively,which was mainly attributed to the synergistic effect of Au and Cu and the carrier effect of Al2O3.In addition,the reaction solvent and the stability of the catalyst were also explored.The results showed that compared with other solvents,the selectivity of DHA was up to 60％when the reaction system was aqueous.In addition,the conversion rate of glycerol and the selectivity of DHA remained at about 30％and 60％after four cycles of tests,indicating that the catalyst has good catalytic stability.
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