在室温下CO氧化条件下,在Au{111}上形成黄金氧化物
Sabine Wenzel1, Dajo Boden1, Irene M N Groot1
1Leiden Institute of Chemistry Einsteinweg 55 2333 CC Leiden The Netherlands.
Physical chemistry chemical physics : PCCP
|August 29, 2024
概括
黄金氧化物岛在低温CO氧化过程中在黄金催化剂上形成. 水和表面污染物促进这种氧化物形成,影响工业应用.
科学领域:
- 表面科学是一门学科.
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 基于黄金的催化剂对选择性低温CO氧化有很大的希望.
- 精确的反应机制,特别是黄金氧化物形成,仍然不清楚.
研究的目的:
- 在Au(111) 模型催化剂上研究金氧化物的形成机制.
- 了解氧气,水,污染物和TiO2纳米颗粒在CO氧化过程中黄金氧化物形成中的作用.
主要方法:
- 使用现场扫描道显微镜 (STM) 来观察Au(111) 模型催化剂上的反应.
- 将催化剂暴露在氧气和CO氧化条件的大气压力下.
主要成果:
- 在反应条件下观察金氧化物岛屿的形成.
- 黄金氧化物形成与Au(111) 阶段边缘的水启用O2解离有关.
- 表面污染物显著促进金氧化物形成,甚至在露台上.
- 在Au(111) 上的TiO2纳米粒子在室温下不会影响金氧化物形成.
结论:
- 黄金氧化物形成是黄金催化剂低温CO氧化的一个关键方面.
- 水和表面污染物在促进金氧化物形成方面发挥着至关重要的作用.
- 这些发现表明,在工业CO氧化条件下,金氧化物可能存在.
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