AES AND SIMS STUDY OF THE COADSORPTION OF CO2 AND O2 ON MOLYBDENUM

被引:8
作者
DAWSON, PH
机构
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY | 1979年 / 16卷 / 01期
关键词
D O I
10.1116/1.569861
中图分类号
O59 [应用物理学];
学科分类号
摘要
The adsorption of CO//2 on polycrystalline molybdenum is blocked even by the partial (aproximately two-thirds) presence of the strongly bound beta //2 oxygen. Pre-adsorption of CO//2 at room temperature does not impede subsequent oxidation. The CO//2 adsorption kinetics at room temperature can be explained by a two-site adsorption model with rapid dissociative chemisorption and carbon and oxygen in equivalent sites. On heating the CO//2-saturated surface above 900 K, CO is lost from the surface. Interaction of CO//2 at 1200 K gives a small buildup of carbon until the surface oxygen concentration increases sufficiently that the loss rate exceeds the deposition rate.
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页码:1 / 5
页数:5
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