KINETIC STUDIES OF METHYLCYCLOPENTANE HYDROGENOLYSIS OVER PLATINUM CATALYSTS
Zhuang Yiping (School of Chemical Engineering, Dalian University of Technology, Dalian 116012)Albert Frennet (Universite Libre de Bruxelles, CP 243, 1050 Brussels, Belgium)
A rate equation (7) derived in this work was used to characterize methylcyclopentane hydrogenolysis over platinum catalysts. For the two parallel reactions, one producing n hexane and the other forming methylpentanes over Pt/SiO 2, the intrinsic activation energy of the C-C bond rupture is the same and the value is about 93 kJ/mol, while a significant difference was found in enthalpy for the adsorption and dehydrogenation of methylcyclopentane between these two reactions. A low apparent activation energy was observed on Pt/Al 2O 3 and PtRe/Al 2O 3, kinetic simulation shows that the intrinsic activation energy is about 33 kJ/mol. This was attributed to the presence of chlorine on the alumina support, which promotes the formation of electron deficient platinum particles and makes the rate controlling step change from the C-C bond rupture on Pt/SiO 2 to product hydrogenation on Al 2O 3 supported catalysts.
【CateGory Index】： O624