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首页> 外文期刊>Catalysis science & technology >Preparation of AuPd/ZnO-CuO for the directional oxidation of glycerol to DHA
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Preparation of AuPd/ZnO-CuO for the directional oxidation of glycerol to DHA

机译：制备AuPd / ZnO-CuO定向氧化甘油DHA

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摘要

Selective activation of the C-O bond of glycerol is a considerable challenge in current academic research. Herein, we fabricate an efficient AuPd/ZnO-CuO catalystviaa simple precipitation method and use it in the selective oxidation of glycerol (GLY) to produce dihydroxyacetone (DHA). Under base-free conditions, the AuPd/ZnO-CuO catalyst exhibits preferable catalytic performance compared with AuPd/ZnO and AuPd/CuO. The turnover frequency (TOF) of AuPd/ZnO-CuO reaches 687.1 h(-1), which is 25 times that of AuPd/CuO and 6 times that of AuPd/ZnO. The AuPd/ZnO-CuO catalyst also shows good selectivity toward DHA and the highest DHA yield of 65.3%, which is at the top level among the reported results. Through STEM-EDS, XRD and Raman analyses, we find that ZnO-CuO is a composite oxide and that Zn and Cu elements in the ZnO-CuO support are uniformly distributed. Furthermore, HRTEM, EPR, and XPS results show that AuPd/ZnO-CuO has smaller AuPd alloy nanoparticles (NPs) but a higher concentration of surface defect sites compared with AuPd/ZnO and AuPd/CuO. Together with the catalytic performance and feasible mechanism, we consider that the enhanced performance of the AuPd/ZnO-CuO catalyst could be mainly ascribed to the rich surface defect sites, which facilitate the adsorption and activation of the secondary hydroxyl groups of glycerol.
机译：切断键的选择性激活甘油是一个相当大的挑战在当前学术研究。AuPd / ZnO-CuO catalystviaa简单的沉淀选择性氧化的方法和使用它甘油生产二羟丙酮(DHA) (g)。在base-free条件下,AuPd / ZnO-CuO催化剂表现出更好的催化性能与AuPd /氧化锌和AuPd /措。营业额(TOF) AuPd / ZnO-CuO频率达到687.1 h(1)的25倍AuPd AuPd /氧化锌/错和6倍。AuPd / ZnO-CuO催化剂也显示了良好的选择性对DHA和DHA产量最高的65.3%,这是在顶层的报道吗结果。分析,我们发现ZnO-CuO复合氧化,ZnO-CuO锌和铜元素支持是均匀分布的。HRTEM、EPR和XPS结果表明AuPd / ZnO-CuO小AuPd合金纳米粒子(NPs)但更高浓度的表面缺陷网站相比AuPd /氧化锌和AuPd /措。催化性能和在一起可行的机制,我们认为加强AuPd / ZnO-CuO催化剂的性能主要归因于富人表面缺陷网站,方便的吸附和激活甘油的次级羟基。

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