被反应剂诱导的Pt催化剂的结构演变被限制在地石中
Xiaoyu Li1, Jinling Cheng1, Huaming Hou2
1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.
JACS Au
|March 1, 2024
概括
使用CO,O2和H2O等反应剂控制 (Pt) 集群大小,使得可调节的催化剂可用于CO氧化. 加入铁 (Fe) 增强了Pt在高温下的稳定性.
科学领域:
- 不同质的催化剂.
- 材料科学是一种材料科学.
- 纳米技术纳米技术
背景情况:
- 在异质金属催化剂中,反应剂诱导的结构变化往往导致活性部位的形成或失活.
- 控制支体内的金属纳米粒子的大小和稳定性对于催化性能至关重要.
研究的目的:
- 为了研究在纯MFI热中亚纳米 (Pt) 集群的结构转变.
- 在各种反应物大气层 (CO,O2,H2O) 下与CO氧化催化活性相关联结构演变.
- 评估铁 (Fe) 融入热带石框架对Pt物种稳定性的影响.
主要方法:
- 合成具有受控Pt物种大小 (单个原子到纳米颗粒) 的Pt-泽奥利特材料.
- 在特定的反应物大气层 (CO,O2,H2O) 下对材料进行处理.
- 结构演变的表征和对CO氧化物的催化试验.
- 将Fe纳入热石框架进行稳定性研究.
主要成果:
- 通过反应剂大气预处理实现的Pt物种大小分布 (单个原子到1-5纳米纳米粒子) 的精确调节.
- 开发高活性和稳定的Pt物种用于CO氧化.
- 铁的加入显著提高了Pt物种在高温 (高达650°C) 烧结时的稳定性.
结论:
- 反应剂诱导的结构进化是控制质中Pt集群大小和催化性能的一个关键因素.
- 铁促进的Pt-zeolite材料在恶劣条件下表现出优越的稳定性,使它们成为催化应用的前景.
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