<p>We examine the thermocatalytic conversion of an individual gaseous hydrocarbon, namely, propane, serving as a model of an associated petroleum gas component in the presence of a modified metal complex catalytic system derived from inorganic compounds. The thermocatalytic conversion of propane was carried out using a catalytic system consisting of a Y‑type zeolite support in the Na form, whose surface was modified by a complex salt derived from ferric chloride and potassium chloride. This catalytic system had a highly‑developed surface and selective catalytic activity for the preparation of aromatic compounds. This zeolite‑containing catalytic system proved effective for the conversion of propane at 500‑600°C with hourly space velocity 1‑2 h^‑1 to give petrochemical products with the predominance of liquid hydrocarbons, namely, C₆–C₈ aromatic compounds containing various spatial isomers.</p>