采用浸渍法制备了不同粒径的活性炭负载的Pt催化剂,并运用扫描电镜、N2吸附-脱附、透射电镜和X射线衍射对催化剂进行了表征.结果表明,当活性炭载体的粒径从253.2μm下降至9.3μm时,其表面积或孔体积变化不大,Pt颗粒高度分散于载体表面,平均粒径为2.8～5.5 nm.这些高度分散的Pt催化剂在非碱性条件下的甘油氧化反应中表现出较高的活性,且随着载体粒径的减小而明显提升.其中粒径为9.3 μm的活性碳负载的Pt催化剂上,游离的甘油酸收率达到47.6％,且催化剂可以重复使用.
Recent progress in the selective oxidation of biodiesel glycerol in aqueous solution by Au,Pt and alloy catalysts was reviewed.A series of Pt catalysts on different sized carbon supports were prepared and characterized by scanning electron microscopy,N2 adsorption,transmission electron microscopy,and X-ray powder diffraction.The average particle size of the carbon supports was decreased from 253.2 to 9.3 μm by ball milling,but their surface area and pore volume were only slightly changed.Pt was highly dispersed on these different sized carbon supports with an average particle size between 2.8-5.0 nm.Glycerol oxidation was catalyzed by these highly dispersed Pt catalysts in a base-free aqueous solution.The activity of the Pt catalysts increased with decreasing particle size of the carbon support,which was attributed to the higher accessibility of reactants to the Pt nanoparticles.The best yield of glyceric acid reached 46.7％ and the catalyst was stable during six recycles.
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