The biomimetic catalyst penta-FTPhPFe(III)OH/Al₂O₃ was synthesized by adsorption of the active complex FTPhPFe(III)OH on Al₂O₃ from a solution in dimethylformamide The active complex concentration relative to the Al₂O₃ mass was 0.64 mg/g. Activity of penta- FTPhPFe(III)/Al₂O₃ biomimetic catalyst in the reaction of methane direct conversion into methanol by green oxidant hydrogen peroxide was studied at the t=150-350°C and atmospheric pressure, where methanol yield was 19.2% with methane conversion of 28%. The kinetic investigation of methane biomimetic monooxidation reaction  with hydrogen peroxide was carried out based on the established coherently synchronized character of reaction and the proposed most probable mechanism for the methane conversion  into its monooxygenates: methanol, formaldehyde and dimethyl ether. The proposed mechanism shows that the formation of CH₃OH and CH₂O occurs through the formation of an active intermediate complex (penta-FTPhPFe(III)OOH/Al₂O₃), and the formation of dimethyl ether through a sequential reaction from methanol, through its dehydration under the action of the acid-base sites of the catalyst, similar to the multifunctional actions of enzymes. The kinetic model has been derived for the rate of methane biomimetic monooxygenation with hydrogen peroxide by jointly solving the determinant equation, which characterizes the chemical conjugation in the reaction system, with the equations obtained by the method of stationary concentrations. The rate constants for elementary reactions, the kinetic and thermodynamic parameters for the formation of the intermediate iron complex of the biomimetic ligand have been calculated. By using these rate constants, the theoretical values for the rate of methane consumption into monooxygenates have been calculated, which adequately describe the experimental data.

doi.org/10.32737/0005-2531-2025-3-54-62