分子催化剂合成策略,以制备原子分散的Fe-N-C异质催化剂
Jason S Bates1, Fatemeh Khamespanah1, David A Cullen2
1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|October 10, 2022
概括
研究人员开发了一种新方法,在化碳 (N-C) 支上制造高活性铁 (Fe) 催化剂. 这种策略提高了氧化反应的催化速率,为催化提供了有前途的进步.
科学领域:
- 材料科学
- 催化剂
- 纳米技术
背景情况:
- 开发高效的异质催化剂对于各种化学转化至关重要.
- 在支架上的原子分散金属位点提供了增强的反应性和选择性.
- 添加碳 (N-C) 材料是单原子催化剂的有希望的支物.
研究的目的:
- 介绍一个新的策略,将原子分散的铁集成到异质的化碳支中.
- 模拟用于催化剂制备的分子宏环铁复合合成.
- 增强铁--碳 (Fe-N-C) 材料的催化活性
主要方法:
- 化ZIF-8金属有机框架以创建N-C支.
- 在150°C时用FeCl2和tributyl amine进行N-C支柱的溶液相金属化.
- 使用57FeMössbauer光谱和偏差校正扫描传输电子显微镜进行了表征.
- 选择性去除Zn2+离子以通过传递增加Fe位点密度.
主要成果:
- 在N-C支中成功集成原子分散的铁.
- 在金属化之前选择性去除Zn2+离子增加了Fe位点密度.
- 与已确定的Fe-N-C催化剂相比,已经证明了更高的催化率.
- 在有氧氧化反应中通过基准测试验证实实效用.
结论:
- 报告的策略有效地将原子分散的铁集成到N-C支上.
- 转金属化方法提高了Fe位点密度和催化性能.
- 这种方法为氧化反应提供了优质Fe-N-C催化剂的途径.
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