支-纳米合金相互作用在原子尺度结构和化学排序中的作用,用于调整催化站点
Lefu Yang1, Shiyao Shan, Rameshwori Loukrakpam
1Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, USA.
Journal of the American Chemical Society
|September 4, 2012
概括
设计活性催化剂依赖于理解支持合金纳米粒子中的原子排序. 这项研究揭示了支持相互作用如何调整--纳米合金对一氧化碳氧化物的催化活性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 表面化学 表面化学
背景情况:
- 了解支持的纳米级合金颗粒中的原子尺度结构和化学排序对于设计有效的催化剂至关重要.
- 支-纳米合金相互作用显著影响纳米颗粒的催化性能.
研究的目的:
- 研究支材料如何影响三元纳米合金 (--) 颗粒的结构和化学排序.
- 阐明支-纳米合金相互作用在调整催化活性和稳定性的作用.
- 确定异质催化剂中氧气激活的新型活性位点.
主要方法:
- 结合X射线光电子光谱学 (XPS),基于同步射线的X射线细结构吸收光谱学 (XAFS) 和高能X射线衍射 (HEXRD) 与原子对分布函数 (PDF) 分析.
- 使用一氧化碳 (CO) 与氧气的催化氧化作为探针反应.
- 在不同的支物 (碳,,) 上使用三元纳米合金的热化学加工.
主要成果:
- 支材料 (碳,,) 显著影响--纳米粒子的结构和化学排序.
- 支持纳米合金相互作用使催化活性和CO氧化稳定性的微调成为可能.
- 在纳米合金表面上发现了一个新的/调节的催化场所,用于氧气激活,与传统场所不同.
结论:
- 支纳米合金相互作用是控制纳米合金原子排序和催化性能的强大策略.
- 已确定的支持纳米合金相互作用支持的氧激活点为设计先进异质催化剂提供了有前途的途径.
- 这种方法允许合理设计具有增强活性和稳定性的催化剂,用于CO氧化等反应.
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