合作性和动态性提高了NiFe干改催化剂的性能
Sung Min Kim1, Paula Macarena Abdala1, Tigran Margossian2
1Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zurich , Leonhardstrasse 21, Zurich 8092, Switzerland.
将铁添加到催化剂中显著提高了甲干改造 (DRM) 的性能. 双金属NiFe催化剂将温室气体二氧化碳和甲转化为合成气体,通过防止碳沉积,提高了稳定性和活性.
科学领域:
- 催化剂
- 材料科学
- 化学工程
背景情况:
- 甲干改 (DRM) 将温室气体 (甲和二氧化碳) 转化为有价值的合成气体.
- 开发稳定和活跃的催化剂对于有效的DRM至关重要.
- 铁等促进剂在二金属催化剂中的作用尚不完全理解.
研究的目的:
- 研究铁 (Fe) 在二金属铁 (NiFe) 催化剂中的作用和作用.
- 在MgxAlyOz支持下合成和表征Ni,Fe和NiFe催化剂.
- 在DRM过程中阐明NiFe催化剂中Fe提升的机制.
主要方法:
- 使用类似酸盐的前体合成单金属Ni,Fe和双金属NiFe催化剂.
- 使用X射线衍射 (XRD),拉曼光谱,温度编程氧化 (TPO),传输电子显微镜 (TEM),XRD操作,X射线吸收光谱 (XAS) 和能量散射X射线光谱 (EDS) 的表征.
- 密度函数理论 (DFT) 的计算,以补充实验发现.
主要成果:
- 双金属Ni4Fe1 (Ni/Ni+Fe) = 0.8) 催化剂表现出最高的活性和稳定性.
- 单金属Ni和Fe催化剂分别表现出快速失活和低活性,主要是由于Ni上的石墨碳形成.
- Fe通过形成FeO来促进DRM,FeO通过氧化还原机制与碳沉积物反应,再生NiFe合金并防止失活.
结论:
- 铁在NiFe催化剂中起到关键的促进作用,可显著提高甲的稳定性和活性.
- 促进效应归因于FeO的现场形成,它通过氧化还原循环积极去除碳沉积物.
- 可能存在于薄表面域,确保靠近Ni活性位点以有效地激活甲和去除碳.
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