Strong Metal Support Interaction as a Key Factor of Au Activation in CO Oxidation,ChemCatChem

当前位置： X-MOL 学术 › ChemCatChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Strong Metal Support Interaction as a Key Factor of Au Activation in CO Oxidation
ChemCatChem ( IF 3.8 ) Pub Date : 2018-08-02 , DOI: 10.1002/cctc.201800972
Alexander Yu. Klyushin _{1,

2} , Travis E. Jones ₁ , Thomas Lunkenbein ₁ , Pierre Kube ₁ , Xuan Li ₁ , Michael Hävecker ₃ , Axel Knop-Gericke ₁ , Robert Schlögl _{1,

2,

3}

Affiliation

We address the question of the nature of Au NP activation and through a combination of experimental and theoretical techniques. In‐situ XPS measurements of Au/TiO₂ during CO oxidation show high catalytic activity can be associated with the formation of an ionic Au species. DFT calculations performed on Au/TiO₂ show that the formation of such ionic Au is due to a strong metal‐support interaction between Au and reduced and defective TiO₂. TEM supports these findings, indicating the formation of an overlayer of transition metal oxide support on Au NPs after CO oxidation. These results suggest TiO₂ lattice oxygen is involved directly in CO oxidation, which was confirmed with labeled ¹⁸O₂ experiments.

中文翻译：

强金属载体相互作用是CO氧化中Au活化的关键因素

我们通过实验和理论技术的结合，解决了金纳米颗粒活化性质的问题。在CO氧化过程中Au / TiO ₂的原位XPS测量表明，高催化活性可能与离子型Au物种的形成有关。在Au / TiO ₂上进行的DFT计算表明，这种离子型Au的形成是由于Au与还原的和有缺陷的TiO ₂之间强烈的金属-载体相互作用。TEM支持了这些发现，表明在CO氧化后在Au NP上形成了过渡金属氧化物载体的覆盖层。这些结果表明，TiO ₂晶格中的氧直接参与了CO的氧化，这一点已通过标记的¹⁸ O ₂得以证实实验。

更新日期：2018-08-02

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11