par Moors, Matthieu 
;Visart de Bocarmé, Thierry ;Kruse, Norbert
Référence European Congress on Catalysis (EuropaCat) (8: 2007-08-26->31: Turku, Finlande)
Publication Non publié, 2007-08-27
;Visart de Bocarmé, Thierry ;Kruse, Norbert Référence European Congress on Catalysis (EuropaCat) (8: 2007-08-26->31: Turku, Finlande)
Publication Non publié, 2007-08-27
Poster de conférence
| Résumé : | We have observed that exposing a nickel tip to ethylene at 615K leads to the formation of a surface carbidic phase which can be removed with hydrogen or oxygen to recover the underlying metal. Chemical analysis of this phase has been realized by PFDMS offering further arguments for its carbidic nature (carbon, nickel and carbon-nickel compounds appear in the spectra). Evidence for ethylene dimerization was found in the collection of C2+ and C4H8+ reaction intermediates. This reaction is known to occur preferentially on crystal planes containing {111}-type terraces which is further confirmed here.Finally, tubular carbon species seems to precipitate on the surface of the tip when lowering the temperature to 300K after exposure to C2H4 between 600K and 900K. |
