Divergent influence of {1 1 1} vs. {1 0 0} crystal planes and Yb3+ dopant on CO oxidation paths in mixed nano-sized oxide Au/Ce1−xYbxO2−x/2 (x = 0 or 0.1) systems,CrystEngComm

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Divergent influence of {1 1 1} vs. {1 0 0} crystal planes and Yb3+ dopant on CO oxidation paths in mixed nano-sized oxide Au/Ce1−xYbxO2−x/2 (x = 0 or 0.1) systems
CrystEngComm ( IF 2.6 ) Pub Date : 2020-08-07 , DOI: 10.1039/d0ce00891e
Piotr Woźniak _{1,

2,

3} , Piotr Kraszkiewicz _{1,

2,

3} , Małgorzata A. Małecka _{1,

2,

3}

Affiliation

In this paper, the fundamental information on interactions in systems concerning nanocrystalline gold disperses on the shaped (octahedron-like or cube-like) Ce_1−xYb_xO_2−x/2 (x = 0 or 0.1) support has been discussed. Four types of Au/Ce_1−xYb_xO_2−x/2 systems with different morphology and defect level of support have been investigated. It was observed that the microstructure and structural features of the support crystals play a key role in the reaction of CO oxidation catalysed by Au/Ce_1−xYb_xO_2−x/2 materials. The divergent influence of Yb³⁺ dopant on the CO reaction as a function of exposing planes of the support was observed for Ce_1−xYb_xO_2−x/2 and Au/Ce_1−xYb_xO_2−x/2 systems. For the undecorated oxides, the presence of Yb³⁺ ions in the ceria matrix increased the activity of the octahedron-like oxides, but decreased it for the cube-like ones. On the other hand, the positive effect of the Yb-dopant on the reactivity of Au/Ce_1−xYb_xO_2−x/2 systems was observed for both morphologies.

中文翻译：

{1 1 1}与{1 0 0}晶面和Yb3 +掺杂剂对混合纳米尺寸氧化物Au / Ce1-xYbxO2-x / 2（x = 0或0.1）系统中CO氧化路径的不同影响

在本文中，讨论了有关纳米晶体金分散在定形（八面体或立方）Ce _{1− x} Yb _x O _{2− x / 2}（x = 0或0.1）载体上的系统相互作用的基本信息。。研究了四种形态和支撑缺陷水平不同的Au / Ce _{1- x} Yb _x O _{2- x / 2}体系。观察到载体晶体的微观结构和结构特征在Au / Ce _{1- x} Yb _x O _2-催化的CO氧化反应中起关键作用_{x / 2种}材料。对于Ce_1-_x Yb_x O_2-_x_{/ 2}和Au / Ce_1-_x Yb_x O_2-_x_{/ /}，观察到Yb³⁺掺杂剂对CO反应的发散作用与载体暴露平面的关系。₂系统。对于未修饰的氧化物，二氧化铈基质中Yb³⁺离子的存在增加了八面体状氧化物的活性，但对于立方状氧化物却降低了活性。另一方面，Yb掺杂剂对Au / Ce_1-_x Yb_x O_2-的反应性具有积极作用两种形态均观察到_x_{/ 2}系统。

更新日期：2020-09-14

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