HREELS STUDY ON COADSORPTION OF OXYGEN AND CYCLOHEXANONE ON THE PT(111) SURFACE

Citation
Ys. Wang et al., HREELS STUDY ON COADSORPTION OF OXYGEN AND CYCLOHEXANONE ON THE PT(111) SURFACE, Chinese Science Bulletin, 43(15), 1998, pp. 1276-1280
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Multidisciplinary Sciences
Journal title
ISSN journal
1001-6538
Volume
43
Issue
15
Year of publication
1998
Pages
1276 - 1280
Database
ISI
SICI code
1001-6538(1998)43:15<1276:HSOCOO>2.0.ZU;2-8
Abstract
The coadsorption of cyclohexanone and oxygen on Pt(lll) has been inves tigated by HREELS and TDS. At 205 K the presence of oxygen induces an ''extra'' red-shift of the C = O stretching of coadsorbed cyclohexanon e. Heating this coadsorbed surface from 205 to 250 K leads to further dehydrogenation to form intermediate species and to complete disappear ance of the C = O stretching band. Above 300 K, the molecule rings of dehydrogenation species cleave to form hydrocarbon fragments and CO mo lecules which directly desorb into the vacuum or react with preadsorbe d oxygen to produce CO2 which leave the surface immediately. TDS resul ts provide further evidence that the preadsorbed oxygen promotes the d ecomposition of cyclohexanone.