通过增加扰乱来改善高热率旋转的碳氧化催化剂
Joshua D Swindell1, Gareth R M Tainton1, Sarayute Chansai2
1Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 21, 2025
概括
螺旋金属氧化物中的配置障碍显著增加一氧化碳 (CO) 的氧化. 在这些地球上丰富的催化剂中增加金属元素提高了活性和稳定性,为贵金属提供了有希望的替代品.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 无机化学 无机化学
背景情况:
- 从地球上丰富的材料中开发活跃和稳定的异质催化剂对于替代白金组金属至关重要.
- 螺旋金属氧化物 (M3O4) 为催化剂设计提供了一个多功能平台,但它们的性能往往受到组成和结构的限制.
- 配置障碍是一种调整催化剂性能的新兴策略.
研究的目的:
- 为了研究螺旋金属氧化物中配置障碍对一氧化碳 (CO) 氧化催化性能的影响.
- 建立元素组成,混乱和催化活性/稳定性之间的结构-功能关系.
- 开发一种中等旋氧化物 (MESO) 和高旋氧化物 (HESO) 的合成方法.
主要方法:
- 使用无溶剂热解方法合成一系列带有不同数量的第一排过渡金属 (Cr, Mn, Fe, Co, Ni, Cu, Zn) 的螺旋金属氧化物.
- 通过一氧化碳 (CO) 氧化性能评估催化活性,特别是测量T10值 (10%CO氧化温度).
- 在反应条件下对催化剂进行长期稳定性测试,并进行包括晶体结构,元素分布和表面分析在内的全面表征.
主要成果:
- 通过将更多的过渡金属纳入螺旋氧化物结构,增加了配置障碍,显著增强了CO氧化活性,T10值下降了63%.
- 最混乱的7金属螺旋氧化物表现出优越的长期稳定性,在14小时内活动仅下降4.7%,而4金属变体下降12.2%.
- 在较高的配置障碍,特定的元素组成和改善的催化性能之间建立了明确的相关性.
结论:
- 配置障碍是一种有效的材料设计原则,用于增强丰富的异质催化剂的活性和稳定性.
- 中等旋氧化物 (MESO) 和高旋氧化物 (HESO) 对CO氧化和潜在的其他催化应用具有很大的前景.
- 这种方法为开发先进的催化剂提供了可行的策略,而不需要依赖昂贵的白金组金属.
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