在PtOx物种上增强CO氧化,通过酸辅助静电吸附合成
Jiaorong Yan1,2, Qiguang Dai1, Hui Wang2
1State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology-Utrecht University Joint Research Center for Sustainable and Circular Chemistry and Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
在Ceria催化剂上的结构氧化 (PtOx) 通过改善CO吸附和减轻中毒效应,显著增强CO氧化. 与其他形式相比,这种新型纳米结构提供了优越的催化活性.
科学领域:
- 不同质的催化剂.
- 材料科学是一种材料科学.
- 表面化学 表面化学
背景情况:
- 基于的催化剂对于CO氧化至关重要.
- 催化剂活动对种的纳米结构高度敏感.
- 了解结构-活动关系是催化剂设计的关键.
研究的目的:
- 在CeO2支 (Pt/CeO2-CA) 上合成和描述结构的PtOx物种.
- 为了评估Pt/CeO2-CA在CO氧化中的催化性能.
- 通过表征和DFT计算,阐明增强活动背后的机制.
主要方法:
- 酸辅助强静电吸附 (SEA) 用于催化剂制备.
- 对CO氧化物的催化活性测试,确定T50和明显的激活能量.
- 先进的催化剂表征技术.
- 密度函数理论 (DFT) 计算用于研究吸附和反应机制.
主要成果:
- Pt/CeO2-CA催化剂的T50在120°C以上低于具有Pt单个原子或PtOx集群的催化剂.
- Pt/CeO2-CA催化剂显示了最低的明显激活能量.
- DFT的计算显示,PtOx上增加了CO吸附,并有利于CO与O*原子的相互作用.
- 结构通过规避与O2竞争性吸附来减轻CO中毒.
结论:
- 在CeO2上的结构PtOx代表了CO氧化的一种高度活跃的催化剂.
- 增强的性能归因于在特定的纳米结构上改善了CO吸附和反应动力学.
- 这项工作为设计支持的贵金属 (氧化物) 纳米结构以改善催化提供了一个有希望的策略.
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