在CO氧化过程中对PtCe修饰的化物ZSM-5的催化性能进行结构驱动的调整
Marina Shilina1, Irina Krotova1, Konstantin Maslakov1
1Chemistry Department, Lomonosov Moscow State University, 119991 Moscow, Russia.
在ZSM-5热带石上的-催化剂在低温下有效氧化一氧化碳 (CO). 优化金属沉积顺序和处理,可以增强废气净化的催化活性.
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:
- 一氧化碳 (CO) 的催化氧化对于处理车辆和工业废气至关重要.
- 在ZSM-5焦 (Z) 上支持的- (PtCe) 催化剂正在研究低温CO氧化.
研究的目的:
- 准备和描述PtCe-ZSM-5催化剂,使用不同的金属沉积序列和热处理.
- 确定CO氧化和CO在过剩中的优先氧化 (PROX) 的结构性能关系.
主要方法:
- 用H2PtCl6和Ce ((NO3) 3) 溶液浸ZSM-5焦岩石的方法.
- 使用SEM,TEM,EDX,DRIFT和X射线光电谱学的表征.
- 在CO氧化和PROX反应中对催化活性的评估.
主要成果:
- 在120°C时,Ce/Pt/Z催化剂实现了100%的CO转化;Pt/Ce/Z需要氧化还原处理才能达到110°C.
- 催化剂在PROX中表现出活性,但缺乏选择性;在重复的CO氧化循环 (TOX) 后,活性得到改善.
- 低负荷 (0.2重量%Pt) 催化剂在95°C时实现了完全的CO转化,显示出高性能.
结论:
- 增强 (Pt) 和 (Ce) 之间的相互作用是优化催化剂性能的关键.
- 制备方法,特别是金属沉积顺序,显著影响催化活性.
- PtCe-ZSM-5催化剂在低温CO氧化应用中表现有前途.
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