<p>Reducing CO content in H₂-CO gas mixtures lowers CO₂ emissions and supports cleaner, more efficient iron production. Hydrogen acts as a sustainable reducing agent, enhancing reaction kinetics while minimizing environmental impact. This study investigates the isothermal reduction of iron oxide briquettes using pure CO and H₂-CO mixtures at temperatures ranging from 600°C to 1100°C. Thermogravimetric analysis (TGA) was employed to monitor weight loss throughout the reduction process. The effects of gas composition, temperature, and reduction time on briquette behavior were examined, along with the reduction kinetics and mechanisms at different stages, and the results showed that temperature significantly influences both the extent and rate of reduction. Higher hydrogen concentrations in the gas mixture accelerated the reduction at any given temperature. The transformation followed a sequential pathway: Fe₂O₃ → Fe₃O₄ → FeO → Fe. Kinetic modeling revealed activation energies of 16.36, 29.24, and 49.35&#xa0;kJ/mol for the early, intermediate, and final stages, respectively. The initial stage was dominated by chemical reactions, the intermediate by a combination of gas diffusion and chemical reactions, and the final stage primarily by gaseous diffusion. These findings demonstrate the potential of hydrogen-enriched gas mixtures to improve reduction efficiency and reduce the environmental footprint of iron making.</p>