揭示了H2激活在CuFeOx催化剂上的促进机制,用于低温CO氧化
Zhenghua Shen1,2, Xiangdong Xing1,2, Yuan She1,2
1School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710064, China.
激活显著提高了CuFeOx催化剂的低温一氧化碳 (CO) 氧化性能. 这种处理促进了二氧化碳的转化,并提高了催化剂的可还性和氧气的流动性.
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:
- 低温一氧化碳 (CO) 氧化对于环境修复至关重要.
- 在温和条件下开发高效的CO氧化催化剂仍然是一个挑战.
研究的目的:
- 为了研究 (H2) 激活对低温CO氧化铜-铁氧化物 (CuFeOx) 催化剂性能的影响.
- 建立催化剂性能和催化剂性能之间的结构-活性关系.
主要方法:
- 在X射线衍射 (XRD) 中.
- 在X射线光电子光谱学 (XPS) 中.
- 用 (H2-TPR) 进行温度编程减温.
- 温度编程的氧气脱氧 (O2-TPD) 过程
- 在现场扩散反射红外里埃变换光谱 (DRIFTS)
主要成果:
- 在175°C时,H2激活的CuFeOx催化剂实现了99.6%的CO转化.
- H2激活促进了Fe2+的形成,增加了氧气空置度,增强了氧气物种的迁移.
- 催化剂的可还原性和低温活性显著提高.
结论:
- H2激活通过增加Fe2+和氧空缺,提高可还原性,并促进活性Cu+物种的形成来提高CuFeOx催化剂的性能.
- 反应机制涉及Mars-van Krevelen (MvK) 路径在低温下,以及MvK和Langmuir-Hinshelwood (L-H) 路径在高温下.
- 优化H2激活是改善CuFeOx催化剂的关键,以实现高效的低温CO氧化.
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