具有表面缺陷的分子的特定位点反应性 - 在Pt上的H2解离的情况
Richard van Lent1,2, Sabine V Auras1, Kun Cao1
1Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, Leiden 2333 CC, Netherlands.
概括
在上讨论了两种解离模型. 这项研究解决了争议,表明局部解离是异质催化剂的关键,而不是预平衡和扩散.
科学领域:
- 不同质的催化
- 表面科学
- 化学运动学
背景情况:
- 两种动态模型解释了异质催化中的弱激活解离.
- 这些模型,一个是预平衡/扩散,另一个是直接/局部反应,是矛盾的.
- 在上离子是关键的反应系统.
研究的目的:
- 解决异质催化剂竞争的动态模型之间的争议.
- 在上量化特定位点的反应性.
- 确定金属表面上的主要解离机制.
主要方法:
- 使用曲单晶表面探测特定位置的反应性.
- 作为步骤密度和类型的函数的量化反应性.
- 测量绝对,特定地点的反应截面.
主要成果:
- 发现反应性取决于步骤类型.
- 在反应性和步骤密度之间观察到线性关系.
- 结果强烈支持局部分离模型.
结论:
- 直接和局部反应模型准确地描述了上的离.
- 预平衡和扩散模型与实验观测不一致.
- 这项工作为阐明异质催化反应机制提供了最终的方法.
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