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对单个粒子的催化反应的高空间分辨率映射

Chung-Yeh Wu^1,2, William J Wolf^1,2, Yehonatan Levartovsky^3,4

¹Department of Chemistry, University of California, Berkeley, California 94720, USA.

|January 10, 2017

概括

具有低协调数的金属原子对于催化是至关重要的. 研究人员使用先进的红外纳米光谱绘制了催化粒子的化学反应图,

科学领域:

不同质的催化
表面科学
纳米技术

背景情况:

在表面步骤/缺陷处的低协调金属原子对于催化是至关重要的.
直接观察这些部位的反应是具有挑战性的.
现有的方法缺乏空间分辨率和化学跟踪.

研究的目的:

在高空间分辨率的催化粒子上直接映射化学转换.
在催化表面上识别反应点.
了解低协调金属原子在催化中的作用.

主要方法:

基于同步子辐射的红外纳米光谱 (SR-IRns).
实现了25纳米的空间分辨率.
表面固的N-异环碳酸分子的化学转换.

主要成果:

在不同的粒子区域中具有不同的反应性.
与平面顶部区域相比,在粒子外围显示出更高的催化活性.
与周边低协调金属原子的存在相关.

结论:

通过SR-IRns可直接可视化催化活性部位的反应.
具有较低协调度的金属原子的粒子外围表现出增强的催化活性.
这项工作为研究纳米级异质催化提供了一个新工具.

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