Surface Diffusion on Oxide Surfaces and Its Role in Supported Metal Catalysis

该项目属于材料化学领域 倡议 氧化物表面吸附气体的扩散 在负载型金属催化中起着举足轻重的作用。 扩散 氧化物表面上的速率显著地影响表面反应 支持的金属。 更有效和化学特异性 催化剂可以通过利用特定的表面和 具有良好表面扩散的界面几何形状 特性. 然而，没有直接测量表面 在良好表征的氧化物表面上的扩散曾经是 执行。 本研究着重于两种模型的氧化 反应：一氧化碳+氧气--二氧化碳 钯/α-氧化铝，二氧化碳+一氧化氮-- 二氧化碳+氮在铑/α-氧化铝上。 并发 反应动力学研究和表面扩散实验将 探索、描述和演示如何利用 在催化重要反应中的表面扩散。 其他机会包括测量氢 对表征良好的钯/α-氧化铝的溢出， 各种表面扩散的比较研究 α-氧化铝和二氧化硅单晶面。

This project is in the area of the Materials Chemistry Initiative. The diffusion of gases adsorbed on oxide surfaces plays a pivotal role in supported metal catalysis. Diffusion rates on oxide surfaces dramatically affect surface reactions on supported metals . More effective and chemically specific catalysts could be designed by utilizing particular surface and interface geometries with favorable surface diffusion properties. However, no direct measurements of surface diffusion on well characterized oxide surfaces have ever been performed. This research focuses on two model oxidation reactions: carbon monoxide + oxygen -- carbon dioxide on palladium/alpha-alumina, and carbon dioxide + nitric oxide -- carbon dioxide + nitrogen on rhodium/alpha-alumina. Concurrent reaction kinetic studies and surface diffusion experiments will explore, characterize, and demonstrate how to exploit the role of surface diffusion in catalytically important reactions. Additional opportunities include a measurement of hydrogen spillover on well-characterized palladium/alpha-alumina and comparison studies of surface diffusion on various alpha-alumina and silicon dioxide single crystal faces.