摘要
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3.8nm,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.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期1831-1837,共7页
基金
supported by the National Natural Science Foundation of China(21073159,90610002)
the Natural Science Foundation of Zhejiang Province(Z406142)
the National Basic Research Program of China(973Program,2007CB210207)~~
关键词
甘油氧化
铂
铋
活性碳载体
二羟基丙酮
glycerol oxidation
platinum
bismuth
carbon support
dihydroxyacetone
