An EELS and TDS study of molecular oxygen desorption and decomposition on Pt(111)

✍ Scribed by Neil R. Avery

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 284 KB
• Volume: 96
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(83)80692-7

✦ Synopsis

Correlation of EEL and TD spectra for the adsorption of 0s on Pt (11 I) at C 100 R has identified the respective roles of the tv-o molecularly adsorbed states in tire apparently competing processes of desorption and dissociation_ In an estensive kinetic study of oxygen adsorption with a Pt(l11)

surface, Gland [l] has shown that. at 100 K, dissociative adsorption does not occur but instead a non-dissociated molecular state is formed. On heating to near 150 K, molecular desorption was accompanied by dissociation to an atomically adsorbed state which subsequently desorbs by recombination at 700-900 K. The saturated coverage of molecularly adsorbed oxygen was estimated at 6.1 X lOI molecules CII~-~ of which, at * 150 K, 4.1 X 1014 mole-