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Gold oxide formation on Au(111) under CO oxidation conditions at room temperature
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2024-08-29 , DOI: 10.1039/d4cp00611a
Sabine Wenzel 1 , Dajo Boden 1 , Irene M N Groot 1
Affiliation  

Although gold-based catalysts are promising candidates for selective low-temperature CO oxidation, the reaction mechanism is not fully understood. On a Au(111) model catalyst, we observe the formation of gold oxide islands under exposure to atmospheric pressures of oxygen or CO oxidation reaction conditions in an in situ scanning tunneling microscope. The gold oxide formation is interpreted in line with the water-enabled dissociation of O2 on the step edges of Au(111). Contaminants on the gold surface can strongly promote the gold oxide formation even on the terraces. On the other hand, TiO2 nanoparticles on the Au(111) do not show any influence on the formation of the gold oxide and are thus not providing a significant amount of atomic oxygen to the gold at room temperature. Overall, the presence of gold oxide is likely under industrial conditions.

中文翻译:


室温 CO 氧化条件下 Au(111) 上氧化金的形成



尽管金基催化剂是选择性低温 CO 氧化的有希望的候选者,但其反应机理尚不完全清楚。在 Au(111) 模型催化剂上,我们在原位扫描隧道显微镜中观察到暴露于大气压氧气或 CO 氧化反应条件下氧化金岛的形成。金氧化物的形成与Au(111) 台阶边缘上O 2的水分解一致。即使在台阶上,金表面的污染物也会强烈促进金氧化物的形成。另一方面,Au(111)上的TiO 2纳米颗粒对金氧化物的形成没有表现出任何影响,因此在室温下不会向金提供大量的原子氧。总体而言,在工业条件下很可能存在氧化金。
更新日期:2024-08-29
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