通过RhV2O3-集群 (n = 2-5) 介导的NO通过CO减少的取决于尺寸的催化反应性
Jin-You Chen1, Hai Zhu2, Tong-Mei Ma1
1China School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou 510641, P. R. China. tongmei@scut.edu.cn.
本研究设计了RhxV2O3-集群,用于使用一氧化碳 (CO) 选择性将氧化 (NO) 减少为 (N2). 较大的集群由于金属支相互作用的改变,表现出大小依赖的催化活性.
科学领域:
- 不同质的催化剂.
- 表面科学是一门科学.
- 计算化学是一种计算化学.
背景情况:
- 对异质催化剂中活性位点的精确结构理解对于设计高效的金属支接口至关重要.
- 氧化 (NO) 减少是环境催化的一个关键过程.
研究的目的:
- 理论上设计和研究RhxV2O3- (n = 2-5) 集群,以选择性减少NO通过CO.
- 阐明这些催化系统的结构-活动关系和尺寸依赖的行为.
主要方法:
- RhxV2O3- (n = 2-5) 集群的理论设计.
- 对减少NO的催化机制进行计算分析.
- 活动部位结构和金属支相互作用的研究.
主要成果:
- 已证明RhxV2O3-集群可选择性地利用CO催化NO降解为N2.
- 观察到一个大小依赖的行为,V原子在N-O键断裂和N-N合中起着至关重要的作用,在较小的集群中 (Rh2-4V2O3-).
- 在较大的集群中 (Rh5V2O3-),NO的降解涉及三个Rh原子之间的合作,在产品中 (Rh2-4V2O4,5-),Rh原子固CO以进行随后的氧化.
结论:
- 该研究强调了金属支接口在确定催化性能方面的重要性.
- 这些发现表明,虽然三原子活性点很重要,但它们的行为和整体催化机制随着集群大小的演变而演变.
- 这项工作为设计用于选择性减少NO的先进催化剂提供了洞察力.
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