This study investigates the impact of varying temperatures on the reduction of iron ore pellets using hydrogen in a blast furnace (BF) environment. The research aims to identify optimal conditions for reducing CO₂ emissions and advancing environmentally friendly steel production. Key findings include: 1. **Reduction Degree (RD)**: The reduction rate increases with higher temperatures, reaching a maximum at 1000 °C and a minimum at 700 °C. Complete reduction of Fe₂O₃ to Fe is achieved at all temperatures, but incomplete reduction is observed at 700 and 800 °C. 2. **Porosity**: Porosity increases significantly with temperature, from 50% to 68%. This increase is attributed to the sintering process, which is confirmed by SEM analysis. Macropores form at high temperatures (900 and 1000 °C), while micropores are absent due to sintering. 3. **Kinetics**: The reduction process is primarily controlled by chemical reactions at the interface. The apparent activation energy for the phase-boundary-controlled model is 33.642 kJ mol⁻¹, slightly lower than literature values, while the diffusion model's activation energy is 30.631 kJ mol⁻¹, higher than literature values. 4. **Microstructure**: SEM analysis reveals the presence of fine micropores and dense metallic iron formations at 700 and 800 °C, with macropores forming at higher temperatures. Gangue, primarily CaO and SiO₂, remains unreacted. 5. **Crack Formation**: Surface cracks begin to form between 800 and 1000 °C, with larger sizes observed at 1000 °C. These findings highlight the potential for using hydrogen in BF operations to reduce CO₂ emissions and improve the efficiency of iron ore reduction. The study provides a basis for developing strategies and technologies to enhance the environmental sustainability of steel production.This study investigates the impact of varying temperatures on the reduction of iron ore pellets using hydrogen in a blast furnace (BF) environment. The research aims to identify optimal conditions for reducing CO₂ emissions and advancing environmentally friendly steel production. Key findings include: 1. **Reduction Degree (RD)**: The reduction rate increases with higher temperatures, reaching a maximum at 1000 °C and a minimum at 700 °C. Complete reduction of Fe₂O₃ to Fe is achieved at all temperatures, but incomplete reduction is observed at 700 and 800 °C. 2. **Porosity**: Porosity increases significantly with temperature, from 50% to 68%. This increase is attributed to the sintering process, which is confirmed by SEM analysis. Macropores form at high temperatures (900 and 1000 °C), while micropores are absent due to sintering. 3. **Kinetics**: The reduction process is primarily controlled by chemical reactions at the interface. The apparent activation energy for the phase-boundary-controlled model is 33.642 kJ mol⁻¹, slightly lower than literature values, while the diffusion model's activation energy is 30.631 kJ mol⁻¹, higher than literature values. 4. **Microstructure**: SEM analysis reveals the presence of fine micropores and dense metallic iron formations at 700 and 800 °C, with macropores forming at higher temperatures. Gangue, primarily CaO and SiO₂, remains unreacted. 5. **Crack Formation**: Surface cracks begin to form between 800 and 1000 °C, with larger sizes observed at 1000 °C. These findings highlight the potential for using hydrogen in BF operations to reduce CO₂ emissions and improve the efficiency of iron ore reduction. The study provides a basis for developing strategies and technologies to enhance the environmental sustainability of steel production.