揭示了对环境光驱光热CO2化对/二氧化物的支尺寸依赖作用
Qiang Li1,2,3, Chunqi Wang1,2,3, Huiling Wang1,2,3
1Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
Angewandte Chemie (International ed. in English)
|January 10, 2024
概括
二氧化 (TiO2) 支的大小影响光热CO2化中的催化剂选择性. 较小的TiO2增强了甲的产生,而较大的TiO2则有利于一氧化碳.
科学领域:
- 不同质的催化剂.
- 光催化作用的光催化
- 绿色化学是一种绿色化学.
背景情况:
- 支持尺寸在异质催化中至关重要,但在光驱动反应中未得到充分研究.
- 金属支相互作用 (MSI) 显著影响催化性能.
- 控制MSI是优化光催化过程的关键.
研究的目的:
- 为了研究TiO2支尺寸对光热CO2化中的选择性的影响.
- 阐明金属支相互作用 (MSI) 在控制催化结果中的作用.
- 通过支尺寸来演示调整光驱动催化性能的一种方法.
主要方法:
- 在不同尺寸的TiO2 (Ni/TiO2-25和Ni/TiO2-100) 上支持催化剂的合成.
- 在模拟的光和环境太阳辐射下对二氧化碳化过程中的催化性能评估.
- 分析金属支相互作用和电荷分离动态.
主要成果:
- 在太阳辐射下,Ni/TiO2-25 (小TiO2) 呈现出增强的MSI,促进了高效的电子转移和高甲选择性 (99.8%),其速率为63.0 mmol g-1 h-1.
- Ni/TiO2-100 (大TiO2) 显示MSI较弱,导致选择性较低,有利于一氧化碳生产 (90.0%),其速率为30.0 mmol g-1 h-1.
- 支尺寸显著改变了甲和一氧化碳形成之间的平衡.
结论:
- TiO2支尺寸是控制光热CO2化选择性的关键因素.
- 在较小的TiO2支中增强的MSI促进了甲的产生,而在较大的支中较弱的MSI有利于CO的形成.
- 这项研究提供了一种新的策略,通过支持工程来定制光催化剂性能.
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