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解码铁在双金属Pt-Fe纳米粒子中对低温逆水气转移反应的促进作用

Colin Hansen¹, Wei Zhou¹, Enzo Brack¹

¹Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland.

Journal of the American Chemical Society

|September 30, 2024

概括

铁促进催化剂显著增强低温逆水气转移 (LT-RWGS) 反应,这对循环碳经济至关重要. 这些双金属Pt-Fe催化剂在活性和CO选择性方面优于传统的Pt催化剂.

科学领域:

催化剂
材料科学
化学工程

背景情况:

反向水气转移反应对化学工业和循环碳经济至关重要.
(Pt) 基催化剂对RWGS有效,但它们的活性状态需要进一步了解.
促进元件可以增强Pt催化剂的性能,但机械洞察力有限.

研究的目的:

研究铁 (Fe) 对低温RWGS (LT-RWGS) 反应的Pt基催化剂的促进作用.
阐明在二氧化上支持的Fe促进Pt催化剂的结构-活性关系.
了解由Fe结合影响的动态表面过程和反应途径.

主要方法:

使用表面有机金属化学 (SOMC) 在 (PtFe@SiO2) 上支持Pt-Fe双金属纳米颗粒的合成.
评估LT-RWGS的催化性能,测量二氧化碳的选择性和形成速度.
使用分散反射率FT-IR光谱 (DRIFTS) 和X射线吸收光谱 (XAS) 的现场表征.

主要成果:

与单金属Pt@SiO2 (0.022 molCO h-1 gcat-1, 96%的选择性) 相比,Pt1Fe1@SiO2催化剂表现出更高的LT-RWGS活性 (0.192 molCO h-1 gcat-1) 和高的CO选择性.
在现场的DRIFTS和XAS显示了双金属Pt-Fe催化剂与单金属Pt催化剂的动态表面过程和不同的反应途径.
将Fe促进剂融入Pt纳米粒子是提高催化性能的关键.

结论:

促进Fe显著提高了基于Pt的催化剂对LT-RWGS的活性和选择性.
这项研究提供了Pt-Fe催化剂在反应条件下的动态行为.
优化的Pt-Fe双金属催化剂代表了循环碳经济中的RWGS应用的前景.

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