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<p>Iron oxide is commonly used as the active component of catalysts. Highly crystalline pure-phase porous α-Fe<sub>2</sub>O<sub>3</sub> particles were prepared by direct thermal decomposition of Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O through a solid-state one-step method of ball milling and mixing with the assistance of citric acid. The thermal decomposition process was discussed. The results show that after the addition of citric acid, the temperature at which all the crystalline water in Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O is removed is 18&#xa0;°C lower than that of the single component Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O, and the initial temperature for the decomposition of Fe(NO<sub>3</sub>)<sub>3</sub> is 6&#xa0;°C lower. The interaction between citric acid and Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O, as well as the formation of new chemical bonds at high temperatures, increased the decomposition temperature of Fe(NO<sub>3</sub>)<sub>3</sub> by 36&#xa0;°C. The apparent activation energy for the decomposition of the precursor was estimated using the KAS and FWO methods. By varying the amount of citric acid, α-Fe<sub>2</sub>O<sub>3</sub> particles with different pore structures could be prepared. This solid-phase method is an effective way to controllably prepare porous α-Fe<sub>2</sub>O<sub>3</sub> with high yield and high crystallinity.</p>

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Thermal analysis research of precursors containing Fe(NO3)3·9H2O

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Bao Tian,
  • Baixu Hu,
  • Yuanyuan Cai,
  • Jiaxing Wang,
  • Yunsheng Xia

摘要

Iron oxide is commonly used as the active component of catalysts. Highly crystalline pure-phase porous α-Fe2O3 particles were prepared by direct thermal decomposition of Fe(NO3)3·9H2O through a solid-state one-step method of ball milling and mixing with the assistance of citric acid. The thermal decomposition process was discussed. The results show that after the addition of citric acid, the temperature at which all the crystalline water in Fe(NO3)3·9H2O is removed is 18 °C lower than that of the single component Fe(NO3)3·9H2O, and the initial temperature for the decomposition of Fe(NO3)3 is 6 °C lower. The interaction between citric acid and Fe(NO3)3·9H2O, as well as the formation of new chemical bonds at high temperatures, increased the decomposition temperature of Fe(NO3)3 by 36 °C. The apparent activation energy for the decomposition of the precursor was estimated using the KAS and FWO methods. By varying the amount of citric acid, α-Fe2O3 particles with different pore structures could be prepared. This solid-phase method is an effective way to controllably prepare porous α-Fe2O3 with high yield and high crystallinity.