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在现场低能电子显微镜的化学波在复合物V-氧化物/Rh(110) 表面

Bernhard von Boehn¹, Jon-Olaf Krisponeit^2,3, Jens Falta^2,3

¹Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3 A, 30167, Hannover, Germany.

Chemphyschem : a European journal of chemical physics and physical chemistry

|May 22, 2024

概括

这项研究揭示了在甲醇氧化过程中表面的氧化瓦纳 (VOx) 覆盖层中的自我组织. 观察到化学波和V氧化物再分配,证明了复杂的表面动态.

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:

在金属表面上的催化甲醇氧化对于化学合成至关重要.
了解氧化瓦纳 (VOx) 覆盖层的行为是设计高效催化剂的关键.
支持氧化膜中的自我组织现象尚未完全理解.

研究的目的:

在VO_x/Rh(110) 表面上对催化甲醇氧化过程中的化学波纹进行研究.
在反应条件下研究V氧化物的再分配.
探索支持氧化覆盖层中的自我组织过程.

主要方法:

使用低能电子显微镜 (LEEM) 进行现场调查.
微点低能电子衍射 (micro-LEED) 用于表面结构分析.
控制的V覆盖 (0.2和0.4MLE) 和回火高达990K.

主要成果:

观测到不同的表面结构 (c(2×2), (1×2),c(2×8), (1×2) / 1×4)) 与减少和氧化V-氧化物相对应.
在回火后确定了一个宏观的孔纹,V-氧化物围绕着低覆盖孔.
通过孔和V-氧化物覆盖的表面积证明了化学波的传播.

结论:

自组织过程发生在Rh{110}上支持的V氧化物覆盖层中.
在这种催化系统中,化学波和大规模的V氧化物再分配是重要的现象.
这些发现为氧化物表面在催化过程中的动态行为提供了新的见解.

关键词:

在LEMEM里.化学波浪模式化学波浪模式不同质的催化剂.甲醇氧化过程中的甲醇氧化是的元素之一.氧化瓦纳的氧化物

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