par Zhuang, Yiping;Frennet, Alfred 
Référence Huaxue Fanying Gongcheng Yu Gongyi, 13, 2, page (155-156)
Publication Publié, 1997
Référence Huaxue Fanying Gongcheng Yu Gongyi, 13, 2, page (155-156)
Publication Publié, 1997
Article révisé par les pairs
| Résumé : | Kinetic modeling was carried out to explore possible reaction mechanism of methylcyclopentane ring opening over a Pt/SiO2. Different mechanisms were considered for the C-C bound rupture: involving a vacant site, an adsorbed hydrogen, a gaseous hydrogen molecule or a combined form of a H2 plus a vacant site. Two equilibrium steps, methylcyclopentne adsorption and dehydrogenation, were found to be included in the reaction scheme in order to derive a rate equation consistent with the experimental data, indicating that the effect of the adsorbed methylcyclopentane on the reaction can not be neglected. A discrimination seems difficult between the competitive rate equations by model fitting. However with the significance of the parameters, it is preferred that the C-C bound rupture involves a molecule hydrogen. No significant difference in activation energy of the C-C bound rupture was found between the reactions forming methylpentanes and n -hexane, the value is about 93 kJ/mol. While there is a significant difference in the adsorption heat of methylcyclopentane for these two reactions, it is -111kJ/mol for n-hexane and -22 kJ/mol for methylpentanes. |
