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独立的多个原子位点功能在组成可调节的不混合的Ru-Rh-Pd-Pt固体溶液高的合金为NO_x 减少超出Rh的性能

Zhe Tan¹, Bo Huang^1,2,3

¹National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi'an Jiaotong University, Innovation Harbour, Xi-xian New District, Xi'an, 712-000, China.

Angewandte Chemie (International ed. in English)

|February 23, 2024

概括

作为多原子位点催化剂 (MASC) 设计的高合金 (HEA) 纳米粒子在减少NOx方面表现出卓越的性能. 这项研究阐明了反应机制,揭示了跨多个金属位点的协同效应,以增强催化活性.

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.
纳米技术纳米技术

背景情况:

高合金 (HEA) 纳米颗粒由于其多金属组成,为先进的功能材料提供了潜力.
由于它们的复杂性,研究HEAs在异质催化中的反应机制具有挑战性.
了解这些机制对于优化催化性能至关重要.

研究的目的:

合成和表征均分散的Ru-Rh-Pd-Pt高合金纳米粒子作为多个原子位点催化剂 (MASC).
为了评估合成的MASC的NOx减排性能.
阐明负责HEA MASC.增强催化活性的反应机制.

主要方法:

同质分散的Ru-Rh-Pd-Pt HEA纳米颗粒的合成,其组成可调节.
对NOx减排的性能测试,包括关灯温度测量.
福里埃变换红外光谱 (FTIR) 用于研究反应中间体和表面物种.

主要成果:

成功合成了具有可控制组成的Ru-Rh-Pd-Pt HEA MASC.
与单金属催化剂相比,Ru0.4(Rh0.33Pd0.33Pt0.33) 0.6 MASC的NOx减排活性显著更高,灯光关闭温度降低了~50°C.
FTIR分析揭示了一种协同机制,涉及CO吸附,NO吸附,NO解离和O溢出,由特定的金属位点 (Ru, Rh, Rh-Pd, Pt) 促进.

结论:

开发的Ru-Rh-Pd-Pt HEA MASC在氧化物减少方面表现出了卓越的性能.
这项研究首次明确阐明了高温的异质催化反应机制.
这项工作突出了HEAs作为高效催化剂的潜力,通过利用多原子位点协同效应.

关键词:

异质的催化机制异质的催化机制减少氧化的减少高合金的高合金.类金属是类金属中的一种.固体解决方案固体解决方案

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