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Support morphology effect on the selective oxidation of glycerol over AuPt/CeO2 catalysts
Journal of Catalysis ( IF 6.5 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.jcat.2020.01.008
Xinyi Zhang , Pengfei Yang , Yanan Liu , Jiahao Pan , Dianqing Li , Bin Wang , Junting Feng

We synthesized a series of CeO2 with controllable morphologies including nanocube (NC), nanorod (NR), and nanopolyhedron (NP), enclosed by different facets, and then explored the support morphology effect on catalytic properties of Au1Pt3 catalysts in glycerol oxidation. As expected, the series of Au1Pt3/CeO2 catalysts exhibit a conspicuous support facet-dependent catalytic performance especially for the catalytic activity. Specifically, the TOF ranks in the order that Au1Pt3/NC (937.8 h−1) > Au1Pt3/NR (713.1 h−1) > Au1Pt3/NP (491.7 h−1). Among three catalysts, Au1Pt3/NC exhibits the most notable interaction strength due to the highest oxidizing capability of Ce6c–O2c sites on NC (1 0 0), confirmed by in situ CO FT-IR. In this case, Pt0 species are more easily oxidized to Pt2+. The strong metal–support interaction promotes the activation ability of oxygen, resulting in the generation of more reactive oxygen species including O2, O22−, and O, among which O2 is proved to be the most favorable species.



中文翻译:

载体形态对AuPt / CeO 2催化剂上甘油选择性氧化的影响

我们合成了一系列具有可控形态的CeO 2,包括被不同面包围的纳米立方体(NC),纳米棒(NR)和纳米多面体(NP),然后研究了载体形态对Au 1 Pt 3催化剂在甘油中催化性能的影响。氧化。如所期望的,Au 1 Pt 3 / CeO 2系列催化剂表现出明显的依赖于载体方面的催化性能,特别是对于催化活性。具体地,TOF以Au 1 Pt 3 / NC(937.8 h -1)> Au 1 Pt 3 / NR(713.1 h -1)> Au的顺序排列。1 Pt 3 / NP(491.7 h -1)。在三种催化剂中,Au 1 Pt 3 / NC由于在NC(1 0 0)上Ce 6c -O 2c位的最高氧化能力而表现出最显着的相互作用强度,这是通过原位CO FT-IR证实的。在这种情况下,Pt 0物种更容易被氧化为Pt 2+。强的金属-载体相互作用促进氧的活化能力,导致更多的活性氧物质,包括的O的生成2 -,O- 2 2-,和O - ,其中ö 2 - 被证明是最有利的物种。

更新日期:2020-04-03
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