制备了一系列活性碳(AC)负载的Pt-Bi双金属催化剂,考察了催化剂中Bi含量对其催化甘油选择性氧化反应性能的影响.结果表明,适量Bi的添加可以改善催化剂中Pt的氧化还原性能,从而有利于催化剂活性的提高和二羟基丙酮(DIHA)产物的生成.当Bi的含量为5％时,该催化剂的活性最高,甘油转化率和DIHA选择性分别达到91.5％和49.0％.表征结果显示,Pt-Bi颗粒的平均粒径为3.8 nm,且高度分散在催化剂表面,这是该催化剂具有较高活性的主要原因.
A series of bimetallic Pt-Bi catalysts with a constant platinum content of 5.0 wt％ and a varied bismuth content (3.0-7.0 wt％)supported on active carbon were prepared and used for glycerol oxidation with oxygen under atmospheric pressure.The bimetallic Pt-Bi/C was efficient for the selective oxidation of glycerol to dihydroxyacetone (DIHA) and the selectivity for DIHA reached 49.0％ at a 91.5％conversion of glycerol over the 5％Pt-5％Bi/C catalyst.X-ray diffraction and transmission electron microscopy analysis revealed that the specially configured Pt-Bi nanoparticles in 5％Pt-5％Bi/C were highly dispersed (3.8 nm) over the active carbon support,which is proposed to contribute to the improved performance.
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