The influence of the composition of the reaction medium on the conversion of a hydrocarbon mixture, which simulates feedstock for the zeoforming process in group composition; was studied with the purpose of obtaining high-octane gasolines and their components over a catalyst containing zeolite with isomorphously substitutable aluminum and iron atoms. Decationated zeolite ZSM-5, which was crystallized in the presence of iron compounds and whose framework contains isomorphously substituting iron atoms, is active in redox reactions and possesses a hydrogenating function. In the presence of hydrogen, the conversion of hydrocarbons on this zeolite follows the bifunctional mechanism. Hydrogenation reactions compete with hydrogen redistribution reactions in intermediate olefinic fragments, resulting in an increase in the yield of light paraffins C-1-C-4 and isoparaffins as products and a decrease in the fort-nation of aromatic hydrocarbons.