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在Au(111) 上被原子氧激活的水,在低温下氧化CO
Tae S Kim1, Jinlong Gong, Rotimi A Ojifinni
1University of Texas at Austin, Department of Chemical Engineering and Chemistry, Center for Nano- and Molecular Science and Technology, and Texas Materials Institute, 1 University Station C0400, Austin, Texas 78712-0231, USA.
水在黄金表面的低温一氧化碳 (CO) 氧化中起着关键作用. 实验表明,即使在77K,水也能积极促进CO的氧化.
科学领域:
- 表面科学是一门学科.
- 不同质的催化剂.
- 化学动力学 化学动力学
背景情况:
- 黄金表面是氧化反应的活性催化剂.
- 低温CO氧化对于各种工业过程至关重要.
- 了解水等共吸附剂的作用对于催化剂设计至关重要.
研究的目的:
- 在低温下研究水在氧气覆盖的Au{111}表面上一氧化碳 (CO) 氧化中的作用.
- 为了阐明由水促进的CO氧化反应机制.
主要方法:
- 使用同位素标记 ([16O]和[H218O]) 来追踪反应期间的氧气来源.
- 在冷温度 (低至77K) 进行表面反应.
- 用一束一氧化碳 (CO) 冲击准备的表面并分析产品的形成.
主要成果:
- 观察到单标记 ([C16O18O]) 和双标记 ([C16O16O]) 二氧化碳的形成.
- 标注水的存在显著影响了产品的分销.
- 在水的存在下,即使在77K的温度下,CO氧化也能有效地发生.
结论:
- 在氧气覆盖的Au上,水作为低温氧化CO的直接促进剂.
- 这项研究提供了强有力的证据,证明水在这些条件下促进了CO氧化.
- 这些发现对设计高效的催化系统在低温下对CO氧化产生影响.
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