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Magnetically separable Fe3O4-SiO2/Pt catalyst and its application for uranium reduction.

Kuntal Kumar Pal1,2, Ramakrishna Reddy3,4, Chanchal Ghosh5

  • 1Reprocessing Material Development Section, Process Radiochemistry Reprocessing Research & Development Division, Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India. kuntal@igcar.gov.in.

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Magnetically separable Fe3O4-SiO2/Pt catalysts efficiently generate U(IV) for nuclear fuel reprocessing. Optimized catalysts, particularly Fe3O4-10SiO2/Pt(300), show high activity and potential for recycling.

Keywords:
CatalysisFe3O4-SiO2/PtHydrogenationMagnetic nanoparticleUranium reduction

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Area of Science:

  • Materials Science
  • Catalysis
  • Nuclear Chemistry

Background:

  • Nuclear spent fuel reprocessing requires efficient methods for uranium reduction.
  • Magnetically separable catalysts offer advantages in separation and recycling.
  • Platinum-based catalysts are crucial for hydrogenation reactions.

Purpose of the Study:

  • To develop magnetically separable Fe3O4-SiO2/Pt catalysts for U(IV) generation.
  • To investigate the effect of reductive heat treatment temperature on catalyst performance.
  • To evaluate catalyst efficiency, magnetization, and recyclability for nuclear applications.

Main Methods:

  • Synthesis of Fe3O4-SiO2/Pt catalysts with ~2% Pt loading via reductive heat treatment.
  • Characterization using X-ray diffraction, magnetization measurements, SEM, and HRTEM.
  • Evaluation of U(VI) reduction to U(IV) in HNO3-N2H4 medium and U(IV) analysis via titrimetric and spectroscopic methods.

Main Results:

  • Catalysts reduced at 200°C and above achieved complete Pt(0) state and showed high U(IV) generation efficiency.
  • Fe3O4-10SiO2/Pt(300) exhibited superior catalytic activity for U(VI) reduction compared to lower temperature variants.
  • Fe3O4-10SiO2/Pt(300) demonstrated high saturation magnetization and was selected as a model catalyst for recycling studies.

Conclusions:

  • Magnetically separable Fe3O4-SiO2/Pt catalysts are effective for U(IV) generation in nuclear fuel reprocessing.
  • Reductive heat treatment temperature significantly influences catalyst magnetization and catalytic activity.
  • Fe3O4-10SiO2/Pt(300) is a promising candidate for practical applications due to its performance and recyclability.