Modular Testing of Dinitrogen Oxide (Nitrogen Hemioxide) Catalytic Decomposition Technology for Off-Gas Cleanup Systems for Brest Spent Nuclear Nitride Fuel Reprocessing


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Abstract

Dinitrogen oxide N2O (nitrogen hemioxide) is one of the harmful components of the off-gases during the reprocessing of spent nitride fuel. It enters the gas phase during the dissolution of nitride fuel in nitric acid and denitration of high-activity raffinate or the bottom solution from the evaporation of intermediate-level wastes. The preferred method of neutralizing it is high-temperature catalytic decomposition. Compositions based on γ-aluminum oxide coated with catalysts were found previously. One of the compositions was checked on a semi-industrial setup. The efficiency of N2O decomposition was studied as a function of temperature. It was established that almost complete decomposition occurs at 465–480°C. The specific rate of N2O decomposition at 425–480°C was found as a function of the initial concentration. It is shown that for constant initial concentration of N2O the specific decomposition rate is almost the same in the investigated temperature interval.

About the authors

S. A. Kulyukhin

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS)

Email: yavoskresenskaya@bochvar.ru
Russian Federation, Moscow

A. A. Bessonov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS)

Email: yavoskresenskaya@bochvar.ru
Russian Federation, Moscow

I. A. Rumer

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS)

Email: yavoskresenskaya@bochvar.ru
Russian Federation, Moscow

O. A. Ustinov

Bochvar High-Technology Research Institute of Inorganic Materials (VNIINM)

Email: yavoskresenskaya@bochvar.ru
Russian Federation, Moscow

Yu. A. Voskresenskaya

Bochvar High-Technology Research Institute of Inorganic Materials (VNIINM)

Author for correspondence.
Email: yavoskresenskaya@bochvar.ru
Russian Federation, Moscow

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