An AES and SIMS study of the co-adsorption of CO2 and O2 on molybdenum
- 1 January 1979
- journal article
- Published by American Vacuum Society in Journal of Vacuum Science and Technology
- Vol. 16 (1) , 1-5
- https://doi.org/10.1116/1.569861
Abstract
The adsorption of CO2 on polycrystalline molybdenum is blocked even by the partial (aproximately two-thirds) presence of the strongly bound β2 oxygen. Pre-adsorption of CO2 at room temperature does not impede subsequent oxidation. The CO2 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 CO2-saturated surface above 900 K, CO is lost from the surface. Interaction of CO2 at 1200 K gives a small buildup of carbon until the surface oxygen concentration increases sufficiently that the loss rate exceeds the deposition rate.Keywords
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