在异质和等离子体催化中振动激发的分子 - 金属表面反应:超越弗里德曼 - 马切雷特模型
Nick Gerrits1, Annemie Bogaerts2,3
1Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University P.O. Box 9502 2300 RA Leiden The Netherlands n.gerrits@lic.leidenuniv.nl.
概括
弗里德曼-马切雷特α方法很难预测等离子体催化中的振动效应. 为了改进微动力学建模,建议采用一种新的,更准确的模型,包括屏障高度和振动模式重叠.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 物理化学 物理化学
- 表面科学是一门学科.
背景情况:
- 反应物的振动激发增强了异质和血催化中的反应性.
- 当前的微动力学模型经常使用弗里德曼-马切雷特α方法来结合这些效应.
- 在等离子体催化模拟中,弗里德曼-马切雷特α方法的准确性尚未得到充分证实.
研究的目的:
- 评估弗里德曼-马切雷特α方法在离散化学吸收中建模振动效应的准确性.
- 开发和提出一种新的,更准确的模型,用于预测催化中的振动效率.
主要方法:
- 弗里德曼-马切雷特α方法与分子动力学模拟的振动效率的比较.
- 基于屏障高度,屏障位置和振动模式与反应坐标重叠的新模型的开发.
- 将新模型与理论振动效率相匹配.
主要成果:
- 弗里德曼-马切雷特α方法与分子动力学数据的一致性非常差 (R2 = -0.35).
- 建议的替代模型显示了显著的改进,达到R2 = 0.52.
- 新模型考虑了振动模式的特异性,而弗里德曼-马切雷特α方法缺乏这种特异性.
结论:
- 弗里德曼-马切雷特α方法对于描述在等离子催化中对金属表面的振动激发分离化学吸收是不可靠的.
- 新开发的模型为微动力学建模提供了更准确,更易于实施的替代方案.
- 拟议的模型依赖于屏障高度,屏障"延迟"和振动模式重叠,提供了更好的预测能力.
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