Sorption and desorption of BrF ₃ on NaF: Studies on thermodynamics and kinetics

I. I. Zherin, A. I. Rudnikov, R. V. Ostvald, V. I. Sobolev, G. N. Amelina

Division for Nuclear-Fuel Cycle

Research output: Contribution to journal › Article

Abstract

Temperature dependence of bromine trifluoride vapor pressure over its adduct with sodium fluoride has been determined; the adduct normal dissociation temperature has been determined. Kinetics of sorption and desorption processes in BrF ₃ (gas)–NaF(solid) system have been studied. The equation was proposed to illustrate the link between forward reaction rate (К _а ) described by Arrhenius equation and experimental value (K _i ): K _i = K _а ⋅ (P _a /P _eq ) ^m , where Ki – observed reaction rate constant, K _a – forward reaction rate constant described by Arrhenius equation; P _a – partial pressure of BrF ₃ ; P _eq – equilibrium pressure of BrF ₃ above BrF ₃ ⋅3NaF; m – factor characterizing the interaction area of BrF ₃ with NaF. The application of this equation makes possible to determine the true reaction rate values and reaction activation energy in chemisorption terms; it also helps to calculate the degree BrF ₃ sorption on NaF reaction at different temperatures and adsorbate pressures. The possibility of sorption-desorption separation of bromine trifluoride – uranium hexafluoride – iodine pentafluoride system with use of sodium fluoride was shown.

Original language	English
Pages (from-to)	25-33
Number of pages	9
Journal	Journal of Fluorine Chemistry
Volume	221
DOIs	https://doi.org/10.1016/j.jfluchem.2019.03.003
Publication status	Published - 1 May 2019

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Keywords

Bromine trifluoride
Desorption
Iodine pentafluoride
Sodium fluoride
Sorption
Uranium hexafluoride

ASJC Scopus subject areas

Biochemistry
Environmental Chemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry

Cite this

Zherin, I. I., Rudnikov, A. I., Ostvald, R. V., Sobolev, V. I., & Amelina, G. N. (2019). Sorption and desorption of BrF ₃ on NaF: Studies on thermodynamics and kinetics. Journal of Fluorine Chemistry, 221, 25-33. https://doi.org/10.1016/j.jfluchem.2019.03.003

Sorption and desorption of BrF ₃ on NaF : Studies on thermodynamics and kinetics. / Zherin, I. I.; Rudnikov, A. I.; Ostvald, R. V.; Sobolev, V. I.; Amelina, G. N.

In: Journal of Fluorine Chemistry, Vol. 221, 01.05.2019, p. 25-33.

Research output: Contribution to journal › Article

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abstract = " Temperature dependence of bromine trifluoride vapor pressure over its adduct with sodium fluoride has been determined; the adduct normal dissociation temperature has been determined. Kinetics of sorption and desorption processes in BrF 3 (gas)–NaF(solid) system have been studied. The equation was proposed to illustrate the link between forward reaction rate (К а ) described by Arrhenius equation and experimental value (K i ): K i = K а ⋅ (P a /P eq ) m , where Ki – observed reaction rate constant, K a – forward reaction rate constant described by Arrhenius equation; P a – partial pressure of BrF 3 ; P eq – equilibrium pressure of BrF 3 above BrF 3 ⋅3NaF; m – factor characterizing the interaction area of BrF 3 with NaF. The application of this equation makes possible to determine the true reaction rate values and reaction activation energy in chemisorption terms; it also helps to calculate the degree BrF 3 sorption on NaF reaction at different temperatures and adsorbate pressures. The possibility of sorption-desorption separation of bromine trifluoride – uranium hexafluoride – iodine pentafluoride system with use of sodium fluoride was shown. ",

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AU - Sobolev, V. I.

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Access to Document

10.1016/j.jfluchem.2019.03.003