设计一个PtCu合金来提高NH-SCO对Pt/SSZ-13催化剂的N2选择性
Pan Yao1,2, Jiayi Li1,2, Mingming Pei3
1Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China.
ACS applied materials & interfaces
|March 13, 2024
概括
将铜添加到催化剂中显著提高了氨氧化中的选择性,这是控制柴油废气中氨滑动的关键过程. 这种合金催化剂可以提高N2的选择性,而不会影响活性.
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
- 环境化学环境化学
背景情况:
- 选择性催化氧化氨 (NH3-SCO) 对于控制柴油排气中的氨滑动至关重要.
- 实现高 (N2) 对贵金属催化剂,特别是 (Pt) 的选择性仍然是一个重大挑战.
研究的目的:
- 通过在Pt/SSZ-13催化剂中引入铜 (Cu) 作为促进剂来增强NH3-SCO反应的N2选择性.
- 研究新型PtCu/SSZ-13催化剂的结构和电子特性,并了解其对NH3-SCO性能的影响.
主要方法:
- PtCu/SSZ-13合金催化剂的合成.
- 使用X射线衍射 (XRD),传输电子显微镜 (TEM),能量分散谱法 (EDS) 绘制,X射线吸收谱法 (XAS) 和X射线光电子谱法 (XPS) 的表征.
- 对NH3-SCO反应的催化性能评估.
主要成果:
- 在PtCu/SSZ-13催化剂中形成PtCu合金通过多种表征技术得到证实.
- XPS分析显示了Pt的电子丰富状态,以及在PtCu/SSZ-13表面上存在缺电子的Cu和Cu2+物种.
- PtCu/SSZ-13催化剂显著提高了对NH3-SCO的N2选择性,同时保持了与Pt/SSZ-13相似的活性.
- 反应机制从Pt/SSZ-13上的NH路径转移到PtCu/SSZ-13上的内部选择性催化还原 (ISCR) 路径.
结论:
- PtCu合金结构和改变的氧化状态是NH3-SCO.CO中增强的N2选择性的原因.
- 本研究提出了一种用于设计NH3-SCO高效合金催化剂的新策略,为汽车排气系统中的NH3滑动控制提供了一个有希望的解决方案.
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