REACTION KINETICS FOR OLEFIN HYDROGENATION OVER COBALT-MOLYBDENUM HYDROTREATING CATALYST AND MODEL STUDY OF CATALYST PROPERTIES

摘要

Intrinsic kinetic data for propylene hydrogenation over a CoMo/Al_2O_3 catalyst were measured in a plug-flow integral reactor at atmospheric pressure in the ranges of temperature and propylene concentration similar to industrial processes. The parameters of several Langmuir-Hinshelwood kinetic models derived from postulated corresponding reaction mechanisms were estimated by DFP variable measurement method. It was shown in view of physical meaning, variance and residue analysis that the data could be simulated satisfactorily by power law model and the models derived from the adsorption of only either molecular hydrogen or dissociated hydrogen. A kinetic optimization method which combined diffusion-reaction model, kinetic data, pore-size distribution and tortuosity factor was proposed in this paper to calculate the intraparticle reaction dead region and intraparticle concentration profiles. The method was used to treat hydrogenation reaction and the model values of tortuosity factor were justified by single pellet string reactor experiments. Research work showed that kinetic optimization method was effective for analysis of any reaction system over arbitrary shapes of catalysts.