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Abstract <p>Extending H<sub>2</sub>-rich reduction studies beyond simple iron oxides to Fe–Ti composite oxides is essential for the lower CO<sub>2</sub> emission utilization of vanadium titanomagnetite. In this work, the non-isothermal reduction behavior of pseudobrookite (Fe<sub>2</sub>TiO<sub>5</sub>), a representative Fe–Ti composite oxide in vanadium titanomagnetite, was systematically investigated using thermogravimetric analysis. The results reveal that increasing the H<sub>2</sub> content significantly affects the reduction behavior of Fe<sub>2</sub>TiO<sub>5</sub>, with the reduction degree increasing from less than 60 pct under 100 pct CO to over 80 pct under H<sub>2</sub>-rich conditions at 1773 K. Microstructural analyses and kinetic analyses show that H<sub>2</sub>-rich reduction leads to refined metallic iron particles and increased porosity, accompanied by a shift in the rate-controlling mechanism from interfacial chemical reaction to diffusion control. The activation energy for the chemical reaction control decreases with increasing H<sub>2</sub> content, while the activation energy for diffusion control increases. In addition, mass spectrometry and differential thermal analysis were used to analyze the gas utilization efficiency and heat absorption issues. H<sub>2</sub>-rich improves gas utilization efficiency. However, when the H<sub>2</sub> content exceeds 25 pct, the overall reduction process shifts from exothermic to endothermic, which is thermodynamically unfavorable.</p> Graphical Abstract <p></p>

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Effect of H2 Content on the Reduction Behavior and Mechanism of Fe2TiO5 in CO–H2 Mixed Gas Atmospheres

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Mao Chen,
  • Buxin Chen,
  • Shuangjiang He,
  • Kaihui Ma,
  • Chenguang Bai,
  • Meilong Hu

摘要

Abstract

Extending H2-rich reduction studies beyond simple iron oxides to Fe–Ti composite oxides is essential for the lower CO2 emission utilization of vanadium titanomagnetite. In this work, the non-isothermal reduction behavior of pseudobrookite (Fe2TiO5), a representative Fe–Ti composite oxide in vanadium titanomagnetite, was systematically investigated using thermogravimetric analysis. The results reveal that increasing the H2 content significantly affects the reduction behavior of Fe2TiO5, with the reduction degree increasing from less than 60 pct under 100 pct CO to over 80 pct under H2-rich conditions at 1773 K. Microstructural analyses and kinetic analyses show that H2-rich reduction leads to refined metallic iron particles and increased porosity, accompanied by a shift in the rate-controlling mechanism from interfacial chemical reaction to diffusion control. The activation energy for the chemical reaction control decreases with increasing H2 content, while the activation energy for diffusion control increases. In addition, mass spectrometry and differential thermal analysis were used to analyze the gas utilization efficiency and heat absorption issues. H2-rich improves gas utilization efficiency. However, when the H2 content exceeds 25 pct, the overall reduction process shifts from exothermic to endothermic, which is thermodynamically unfavorable.

Graphical Abstract