High-pressure liquid phase hydroconversion of heptaneonane mixtures on Pt/H-Y zeolite catalyst

摘要

The competitive hydroconversion of heptane and nonane molecules in their mixtures was stuided in a continuous flow,fixed-bed reactor filled with Pt/HY zeolite catalyst.Liquid-phase reaction conditions were established at reaction temperatures of 230,250,and 270 deg C by pressurizing the reactor at 100 bar.Hydrogen was supplied in an absorbed state with the liquid hydrocarbon feed.Under these liquid-phase reaction conditions,the apparent reaction rates of heptane and nonane were almost identical.In a simialr experiment under vapor-phase conditiosn,nonbane was much more reactive than heptane.The conversion data under liquid-phase conditions were analyzed with an adsorption-reaction model based on intrinsic kinetic parameters obtained from vapor-phase experiemnts.The model revealed that the enhanced reactivity of heptane in the liquid pahse was due to its preferential adsorption.Simulation of the adsorption of the heptaneonane mixture in the pores of zelite Y with the configurational-bias Monte Carlo method confirmed the preferential adsorption of heptane in zeolite Y at high pressure.Under such conditions,in zeolite Y supercages the packing of the smaller heptane molecules is more favorable than that of the larger nonane molecules.