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制备了Pd含量为1 wt%、不同Pb/Pd摩尔比的γ-Al_2O_3负载Pd-Pb双金属催化剂,并用于常压、45°C和pH=11条件下H_2O_2氧化甘油反应中.催化剂的形貌和分散度采用扫描电镜-X射线电子散射谱和透射电镜进行了表征;双金属催化剂中合金相用X射线光电子能谱进行了验证.单金属Pd催化剂上反应结束后甘油转化率为19%,但随着Pb的加入甘油转化率增大到约100%.所制四个不同Pb/Pd原子比的双金属催化剂Pd Pb0.25,Pd Pb0.50,Pd Pb1.00和Pd Pb1.60均可氧化甘油至二羟基丙酮(DIHA),反应结束后DIHA选择性分别可达59%,58%,34%和25%.
Γ-Al 2 O 3 supported Pd-Pb bimetallic catalysts with Pd content of 1 wt% and different Pb / Pd molar ratios were prepared and used in the reaction of H 2 O 2 with glycerol at atmospheric pressure, 45 ° C and pH = 11. The catalyst The morphology and dispersity were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The alloy phase in the bimetallic catalyst was characterized by X-ray photoelectron spectroscopy.The conversion of glycerol was 19% , But the glycerol conversion increased to about 100% with the addition of Pb. Four bimetallic catalysts Pd Pb0.25, Pd Pb0.50, Pd Pb1.00 and Pd Pb1.60 were prepared at four different Pb / Pd atomic ratios Both glycerol and dihydroxyacetone (DIHA) were oxidized, and the DIHA selectivity reached 59%, 58%, 34% and 25% respectively after the reaction.