降解剂对氧空位和CO优先氧化场所之间的氧空位和Au场所之间的结构活性关系的影响
Ganghua Xiang1, Xing Lin1, Zhigang Liu1
1Advanced Catalytic Engineering Research Centre of the Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China. liuzhigang@hnu.edu.cn.
Nanoscale
|April 2, 2025
概括
减少可以为CO-PROX反应创造最佳的基黄金催化剂. 这种缺陷工程通过精确控制氧气空缺和黄金位置来增强催化活性和稳定性.
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
- 表面化学 表面化学
背景情况:
- 基于Ceria (CeO2) 的黄金 (Au) 催化剂在富含H2的流中对偏好的CO氧化 (CO-PROX) 有效.
- 催化剂的性能可以通过缺陷工程和金矿现场的调整来提高.
研究的目的:
- 在CeO2上使用各种还原剂 (H2,NaBH4,甲酸) 构建氧空缺 (Ov).
- 调整AU网站的电子结构和协调环境.
- 为了研究Ov对CO-PROX催化性能的影响.
主要方法:
- 使用H2,NaBH4和酸合成Ov工程CeO2支持.
- 使用电子磁共振 (EPR),电化学阻抗光谱 (EIS) 和X射线光电子光谱 (XPS) 的表征.
- 对CO-PROX反应进行催化试验.
主要成果:
- 在400°C降低H2的催化剂 (Au/CeO2-H2-400) 显示出优越的CO-PROX性能.
- 在广泛的温度范围内 (70-150°C) 实现了完整的CO转化,具有高选择性和稳定性.
- 减少H2导致了缩的Ov分布,促进了Au+形成和增强了CO吸附.
结论:
- 减少是一种有效的方法,用于创建CO-PROX的高活性和稳定的基黄金催化剂.
- 优化氧气空缺和黄金物种 (Au+) 对于增强的催化活性至关重要.
- 拟议的机制强调了Ov在促进CO吸附和氧激活中的作用.
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