在V2O5-x上的表面活性过氧化物形成及其与氧化物异常电子带结构的相关性
Sangyeon Lee1, Vidhya Chakrapani1
1Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
Langmuir : the ACS journal of surfaces and colloids
|August 1, 2025
概括
氧化 (V2O5) 催化剂通过表面转移兴奋剂形成过氧化物种,而不是传统的Mars-van Krevelen机制. 这一发现影响了在催化氧化过程中对反应性氧物种的理解.
科学领域:
- 不同质的催化剂.
- 表面化学 表面化学
- 材料科学是一种材料科学.
背景情况:
- 氧化 (V2O5) 是工业氧化反应中的关键催化剂.
- 氧物种,特别是活性氧物种 (ROS) 在V2O5催化中的作用尚未完全理解.
- 之前的工作在V2O5-x表面上确定了氧空隙 (VO) 的过氧化物 (O2^2-),但不是超氧化物 (O2^-).
研究的目的:
- 阐明V2O5.5.2上表面吸收过氧化物 (O2^2-) 种类的形成机制.
- 研究O2^2-形成与V2O5.5的电子带结构之间的关系.
- 探索对催化转换的影响.
主要方法:
- 使用了计算建模和表面科学技术.
- 对V2O5-x.电子带结构的分析.
- 研究氧气吸附和反应性氧物种 (ROS) 的形成.
主要成果:
- 在V2O5-x表面上发生过氧化物 (O2^2-) 形成是独立于Mars-van Krevelen (MvK) 机制的.
- 在V2O5-x中传导带电子的高密度通过表面转移剂促进了自发O2^2-形成.
- 吸附的水和H+有助于形成双层,稳定O2^2-并增强催化作用.
结论:
- 在V2O5上形成过氧化物种是由表面转移兴奋剂驱动的,由退化的导电带电子启动.
- 这种机制不同于传统的MvK路径,强调了表面电子特性的重要性.
- 通过双层稳定活性氧物种,促进V2O5系统中的催化活性.
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