高活性 Pt-Fe 催化剂以超宽温度窗口向 CO 优先氧化
Jun Yu1,2, Boyu Song1, Yusen Yang1,3
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Angewandte Chemie (International ed. in English)
|May 29, 2025
概括
这项研究引入了一种新型的催化剂,用于在H2中优先氧化CO (CO-PROX),这对燃料电池性能至关重要. 新的催化剂表现出卓越的效率和广泛的操作温度范围,显著推进了净化技术.
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
- 电化学 电化学 电化学
背景情况:
- 质子交换膜燃料电池 (PEMFC) 需要高度纯净的,需要有效地去除剩余的一氧化碳 (CO),以防止 (Pt) 催化剂中毒.
- 首选氧化二氧化碳在H2 (CO-PROX) 是净化的一个关键技术,但开发具有高效率和广泛工作温度窗口的催化剂仍然具有挑战性.
研究的目的:
- 为CO-PROX开发一种新的催化剂,为PEMFC应用增强性能和稳定性.
- 研究开发的催化剂的结构-活性关系和催化机制.
主要方法:
- 在MgAlOx (MA) 的支持下合成Fe(OH) x修饰的Pt集群催化剂,该催化剂来自PtFeMgAl层的双氧化物 (LDH) 前体.
- 使用现场实验研究和理论计算进行催化剂的表征.
- 在各种条件下对CO-PROX的催化性能进行评估,包括高空间速度和广泛的温度范围.
主要成果:
- 最优的催化剂,Pt-Fe(OH) x/MA,在一个宽的温度窗口 (25°C225°C) 中,在高空间速度 (130,000 mL gcat-1 h-1) 中,表现出完全的CO转化.
- 催化剂在25°C时达到9.09 molCO gPt−1 h−1的质量特异活性,超过了最先进的催化剂.
- 一个240小时的稳定性测试证实了催化剂的满意耐用性.
- 机理学研究发现了协同的界面催化作用,其中涉及Ptδ+(OH) xFe3+位点用于CO氧化和Fe2+位点用于O2激活.
结论:
- 开发的Pt-Fe(OH) x/MA催化剂提供了卓越的CO-PROX性能和稳定性,解决了PEMFCs净化方面的关键挑战.
- 该研究提出了一个成功的界面协同催化策略,用于设计高效的CO-PROX催化剂.
- 这项工作对净化技术的基本理解和实际应用具有重大意义.
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