Understanding of selective base‐free oxidation of glycerol to dihydroxyacetone (DHA) over Pt‐based catalysts is of paramount scientific and industrial importance. In this work, a comparative study between differently sized SbO_x‐promoted and unpromoted Pt/CNTs catalysts is carried out to decouple the promoter effects from the metal size effects. The introduction of SbO_x appears to enhance both the glycerol oxidation activity and the DHA selectivity, and the largely sized promoted Pt/CNTs catalysts afford a relatively high DHA yield and less C–C bond cleavage. X‐ray photoelectron spectroscopy measurements reveal that the Sb species are mainly in the form of SbO_x, and the differently sized promoted catalysts show similar metal binding energies. Furthermore, theoretical studies on the promotional effects of SbO_x are carried out by DFT calculations. It is found that the presence of the promoter on the catalyst surface favors the preferential activation of the secondary hydroxyl group. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3979–3987, 2018

中文翻译：

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SbOx促进的pt纳米颗粒负载在CNT上，作为甘油无碱氧化为二羟基丙酮的催化剂

了解在基于Pt的催化剂上甘油选择性地无碱氧化为二羟基丙酮（DHA）具有重要的科学和工业意义。在这项工作中，进行了不同尺寸的SbO _x促进的和未促进的Pt / CNTs催化剂之间的比较研究，以使促进剂效应与金属粒径效应脱钩。SbO _x的引入似乎增强了甘油的氧化活性和DHA选择性，而且尺寸大大提高的Pt / CNTs催化剂提供了相对较高的DHA收率和较少的C-C键断裂。X射线光电子能谱测量表明Sb物种主要以SbO _x的形式存在，不同尺寸的助催化剂显示出相似的金属结合能。此外，通过DFT计算对SbO _x的促进作用进行了理论研究。发现助催化剂在催化剂表面上的存在有利于仲羟基的优先活化。©2018美国化学工程师学会AIChE J，64：3979–3987，2018