Abstract
Auger electron spectroscopy (AES) and the chemisorption-induced resistance change (CIRC) have been employed to compare the kinetics of low pressure H 2S adsorption on clean and oxygen-covered Fe films. Although the oxygen overlayer does not appear to affect the saturation coverage of adsorbed H 2S, it does significantly enhance the adsorption rate when compared with the clean Fe surface. Differences are also observed in the sulfur Auger spectrum obtained from the two surfaces. It is suggested that the differences observed in the adsorption rates and the shapes of the uptake curves result from a change in the rate-limiting adsorption step; from island growth for the clean Fe surface to molecular-precursor mediated adsorption on the oxygen-covered Fe surface. The adsorption of H 2S did not lead to any obvious corrosion of the oxygen overlayer at the temperature of these measurements, about 295 K.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
