单原子Pt具有显著提升的性能由中孔空心Ceria支持甲基环素脱
Shenghui Zhou1,2, Mohammadreza Kosari3, Hossein Akhoundzadeh1
1School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Angewandte Chemie (International ed. in English)
|January 14, 2026
概括
研究人员开发了高效的中孔空心支持单原子催化剂 (Pt SACs) 来从甲基环 (MCH) 释放. 这些催化剂在工业条件下表现出高性能和稳定性,超过了以前的材料.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 甲基环/多 (MCH/TOL) 是一种可行的液态有机载体 (LOHC),由于其低毒性和基础设施兼容性.
- 对于从MCH释放的 (H2) 来进行实际LOHC应用,需要高效的催化剂.
- 以前的单原子催化剂 (SAC) 在现实条件下显示出有限的活性和转化.
研究的目的:
- 合成和评估用于MCH脱的新型半孔空心支持单原子催化剂 (Pt1/mh-CeO2) .
- 在无载体气体的工业相关条件下研究这些SAC的催化性能和稳定性.
- 阐明有助于增强催化性能的结构-活性关系.
主要方法:
- 合成具有可调节孔隙结构的中孔空心支持物.
- 将单个原子固定在基支持上,以创建具有不同Pt负载 (0.1-0.75 wt%) 的Pt1/mh-CeO2触媒.
- 使用诸如蒸汽扩散实验和动态模拟等技术进行表征,以了解MCH吸附和激活机制.
主要成果:
- 催化剂Pt1/mh-CeO2表现出高演变速率,其速率为4705 mmol·gPt-1·min-1,MCH转换率为25% (近动态区域),Pt负载为0.25%.
- 在更现实的条件下 (94%的转换率) 保持了出色的性能,产生了3106 mmol·gPt-1·min-1的高表面进化率,稳定性良好.
- 增强的性能归因于可访问的Pt单个位点,改善了MCH分子的质量转移,并促进了MCH吸附/激活,这是由支持上的氧气空缺所促进的.
结论:
- 介孔空心支持的Pt SACs代表了MCH有效释放的催化剂的重大进步.
- 催化剂设计克服了以前的SACs的局限性,在工业相关条件下提供高活性和稳定性.
- 这些发现为LOHC应用的催化剂设计原则提供了关键的见解,强调了支形态和金属单位相互作用的作用.
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