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Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species

Research output: Contribution to conference - Without ISBN/ISSN › Conference paper › peer-review

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Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species. / Chimes, M.; Boxall, C.; Edwards, S. et al.
2020. 549-555 Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, Washington, United States.

Research output: Contribution to conference - Without ISBN/ISSN › Conference paper › peer-review

Harvard

Chimes, M, Boxall, C, Edwards, S, Sarsfield, M, Taylor, RJ & Woodhead, D 2020, 'Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species', Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, United States, 22/09/19 - 26/09/19 pp. 549-555.

APA

Chimes, M., Boxall, C., Edwards, S., Sarsfield, M., Taylor, R. J., & Woodhead, D. (2020). Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species. 549-555. Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, Washington, United States.

Vancouver

Chimes M, Boxall C, Edwards S, Sarsfield M, Taylor RJ, Woodhead D. Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species. 2020. Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, Washington, United States.

Author

Chimes, M. ; Boxall, C. ; Edwards, S. et al. / Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species. Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, Washington, United States.7 p.

Bibtex

@conference{36a505fed44740339986e337b0c29fda,
title = "Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species",
abstract = "Neptunium has been previously shown to present challenges within a used nuclear fuel reprocessing scheme due to its tendency to exist in the (IV), (V), and (VI) oxidation states simultaneously. In order to control this neptunium speciation, and informed by relevant work in the literature, we are currently engaged in a study of nitric/nitrous acid redox chemistry with Np(V) and Np(VI). To minimize radiological exposure risks, we are also exploring the validity of using vanadium as an analogue for the study of the kinetics of the Np(VI)/Np(V) reduction by nitrous acid. The kinetics of the reduction of vanadium(V) by nitrous acid in solutions of nitric acid was investigated spectrophotometrically by the method of initial rates. Orders of reaction with respect to V(V), and HNO2 were previously found to be 0.90, and 1.25 respectively, in reasonable agreement with the analogous reaction orders for the reduction of Np(VI) by nitrous acid previously reported by Precek and Paulenova - suggesting that, for this particular reduction, V(V) can serve as a good kinetic analogue for Np(VI). Within this study orders of reaction with respect to [H +], [NO3 -], [SO4 2-], and [ClO4 -] have also been found to be 0.1, -0.2, 0.1, and 0 respectively. Preliminary experiments have also been conducted on the reduction of V(V) by the known reducing agent NO which has hitherto not been considered in the reduction of Np(VI) to Np(V). ",
keywords = "Fuels, Inorganic acids, Kinetics, Light water reactors, Nitrogen oxides, Nuclear fuel reprocessing, Analogous reactions, Initial rate, Nitrogen oxide species, Nitrous acid, Oxidation state, Redox chemistry, Reduction reaction, Vanadium compounds",
author = "M. Chimes and C. Boxall and S. Edwards and M. Sarsfield and R.J. Taylor and D. Woodhead",
note = "Funding text 1: MC is supported by both the EPSRC (via a “Next Generation Nuclear” Centre for Doctoral Training PhD studentship) and the Lloyds Register Foundation (LRF). Part of the work was conducted in Lancaster University{\textquoteright}s UTGARD Lab (Uranium / Thorium beta-Gamma Active R&D Lab), a National Nuclear User Facility supported by the EPSRC. CB is also supported by the LRF (award no. G0025). The LRF supports the advancement of engineering-related education, and funds research and development that enhances safety of life at sea, on land and in the air. ; 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019 ; Conference date: 22-09-2019 Through 26-09-2019",
year = "2020",
month = jan,
day = "1",
language = "English",
pages = "549--555",
url = "http://globaltopfuel.ans.org/",

}

RIS

TY - CONF

T1 - Reduction reactions of vanadium as a neptunium analogue with nitrogen oxide species

AU - Chimes, M.

AU - Boxall, C.

AU - Edwards, S.

AU - Sarsfield, M.

AU - Taylor, R.J.

AU - Woodhead, D.

N1 - Funding text 1: MC is supported by both the EPSRC (via a “Next Generation Nuclear” Centre for Doctoral Training PhD studentship) and the Lloyds Register Foundation (LRF). Part of the work was conducted in Lancaster University’s UTGARD Lab (Uranium / Thorium beta-Gamma Active R&D Lab), a National Nuclear User Facility supported by the EPSRC. CB is also supported by the LRF (award no. G0025). The LRF supports the advancement of engineering-related education, and funds research and development that enhances safety of life at sea, on land and in the air.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Neptunium has been previously shown to present challenges within a used nuclear fuel reprocessing scheme due to its tendency to exist in the (IV), (V), and (VI) oxidation states simultaneously. In order to control this neptunium speciation, and informed by relevant work in the literature, we are currently engaged in a study of nitric/nitrous acid redox chemistry with Np(V) and Np(VI). To minimize radiological exposure risks, we are also exploring the validity of using vanadium as an analogue for the study of the kinetics of the Np(VI)/Np(V) reduction by nitrous acid. The kinetics of the reduction of vanadium(V) by nitrous acid in solutions of nitric acid was investigated spectrophotometrically by the method of initial rates. Orders of reaction with respect to V(V), and HNO2 were previously found to be 0.90, and 1.25 respectively, in reasonable agreement with the analogous reaction orders for the reduction of Np(VI) by nitrous acid previously reported by Precek and Paulenova - suggesting that, for this particular reduction, V(V) can serve as a good kinetic analogue for Np(VI). Within this study orders of reaction with respect to [H +], [NO3 -], [SO4 2-], and [ClO4 -] have also been found to be 0.1, -0.2, 0.1, and 0 respectively. Preliminary experiments have also been conducted on the reduction of V(V) by the known reducing agent NO which has hitherto not been considered in the reduction of Np(VI) to Np(V).

AB - Neptunium has been previously shown to present challenges within a used nuclear fuel reprocessing scheme due to its tendency to exist in the (IV), (V), and (VI) oxidation states simultaneously. In order to control this neptunium speciation, and informed by relevant work in the literature, we are currently engaged in a study of nitric/nitrous acid redox chemistry with Np(V) and Np(VI). To minimize radiological exposure risks, we are also exploring the validity of using vanadium as an analogue for the study of the kinetics of the Np(VI)/Np(V) reduction by nitrous acid. The kinetics of the reduction of vanadium(V) by nitrous acid in solutions of nitric acid was investigated spectrophotometrically by the method of initial rates. Orders of reaction with respect to V(V), and HNO2 were previously found to be 0.90, and 1.25 respectively, in reasonable agreement with the analogous reaction orders for the reduction of Np(VI) by nitrous acid previously reported by Precek and Paulenova - suggesting that, for this particular reduction, V(V) can serve as a good kinetic analogue for Np(VI). Within this study orders of reaction with respect to [H +], [NO3 -], [SO4 2-], and [ClO4 -] have also been found to be 0.1, -0.2, 0.1, and 0 respectively. Preliminary experiments have also been conducted on the reduction of V(V) by the known reducing agent NO which has hitherto not been considered in the reduction of Np(VI) to Np(V).

KW - Fuels

KW - Inorganic acids

KW - Kinetics

KW - Light water reactors

KW - Nitrogen oxides

KW - Nuclear fuel reprocessing

KW - Analogous reactions

KW - Initial rate

KW - Nitrogen oxide species

KW - Nitrous acid

KW - Oxidation state

KW - Redox chemistry

KW - Reduction reaction

KW - Vanadium compounds

M3 - Conference paper

SP - 549

EP - 555

T2 - 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019

Y2 - 22 September 2019 through 26 September 2019

ER -