Catalyzed Hydrogenation of Nitrogen and Ethylene on Metal (Fe, Pt) Single Crystal Surfaces and Effects of Coadsorption: A Sum Frequency Generation Vibrational Spectroscopy Study.

Westerberg, S. P. G.

Technical Information Center Oak Ridge Tennessee

关键词: Hydrogenation;    Catalysis;    Metals;    Adsorption;    Ammonia;   

RP-ID  :  DE2005838077

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

High-pressure catalytic reactions and associated processes, such as adsorption have been studied on a molecular level on single crystal surfaces. Sum Frequency Generation (SFG) vibrational spectroscopy together with Auger Electron Spectroscopy (AES), Temperature Programmed Desorption (TPD) and Gas Chromatography (GC) were used to investigate the nature of species on catalytic surfaces and to measure the catalytic reaction rates. Special attention has been directed at studying high-pressure reactions and in particular, ammonia synthesis in order to identify reaction intermediates and the influence of adsorbates on the surface during reaction conditions. The adsorption of gases N(sub 2), H(sub 2), O(sub 2) and NH(sub 3) that play a role in ammonia synthesis have been studied on the Fe(111) crystal surface by sum frequency generation vibrational spectroscopy using an integrated Ultra-High Vacuum (UHV)/high-pressure system.