A method for catalytic reduction of hexavalent uranium to prepare tetravalent uranium solution

By loading precious metal catalysts on the ZSM-5 molecular sieve and using reducing agents such as hydrazine nitrate under acidic conditions, the efficient catalytic reduction of hexavalent uranium was achieved, and the problems of low conversion rate of hexavalent uranium and safety hazards in the prior art were solved, and efficient, stable and safe preparation of tetravalent uranium was achieved.

CN115999626BActive Publication Date: 2025-03-18DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES +1
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Patent Information

Application Number
CN202111232988.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-10-22
Publication Date
2025-03-18
Estimated Expiration
2041-10-22

AI Technical Summary

Technical Problem

In the prior art, the conversion rate of hexavalent uranium is low, resulting in a low concentration of tetravalent uranium, affecting the recycling of plutonium products and the recycling efficiency of uranium products. At the same time, the catalytic hydrogenation method poses complex equipment and safety risks.

Method used

A noble metal catalyst supported by molecular sieve is specifically used to soak the ZSM-5 molecular sieve in alkaline solution, and then support precious metals such as Pt or Ir to form a catalyst, and use reducing agents such as hydrazine nitrate under acidic conditions to perform catalytic reduction of hexavalent uranium.

Benefits of technology

The effect of mild reaction conditions and high yield of tetravalent uranium is achieved. The catalyst preparation method is simple, with high stability and efficient catalytic performance. The conversion rate of U(VI) can reach 99%.

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Abstract

The present invention provides a method for catalytic reduction of hexavalent uranium to tetravalent uranium, the method comprising using a molecular sieve-supported noble metal catalyst, using hydrazine nitrate or formic acid or formaldehyde as a reducing agent, under the conditions of a reaction temperature of 15-60°C, an acidity of 0.5-1.0 mol / L, a hexavalent uranium concentration of 100-300 g / L, and a reaction pressure of normal pressure, catalytically reducing hexavalent uranium ions to tetravalent uranium ions. In the method provided by the present invention, hexavalent uranium can be effectively reduced to tetravalent uranium under the conditions of a molecular sieve-supported noble metal catalyst, the conversion rate of hexavalent uranium can reach up to 99%, and good stability is shown, with good industrial application prospects.
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