Issue 41, 2022

Radiation-induced reaction kinetics of Zn2+ with eS and Cl2˙ in Molten LiCl–KCl eutectic at 400–600 °C

Abstract

Molten chloride salts are currently under consideration as combined coolant and liquid fuel for next-generation molten salt nuclear reactors. Unlike complementary light-water reactor technologies, the radiation science underpinning molten salts is in its infancy, and thus requires a fundamental mechanistic investigation to elucidate the radiation-driven chemistry within molten salt reactors. Here we present an electron pulse radiolysis kinetics study into the behaviour of the primary radiolytic species generated in molten chloride systems, i.e., the solvated electron (eS) and di-chlorine radical anion (Cl2˙). We examine the reaction of eS with Zn2+ from 400–600 °C (Ea = 30.31 ± 0.09 kJ mol−1), and the kinetics and decay mechanisms of Cl2˙ in molten lithium chloride-potassium chloride (LiCl–KCl) eutectic. In the absence of Zn2+, the lifetime of eS was found to be dictated by residual impurities in ostensibly “pure” salts, and thus the observed decay is dependent on sample history rather than being an intrinsic property of the salt. The decay of Cl2˙ is complex, owing to the competition of Cl2˙ disproportionation with several other chemical pathways, one of which involves reduction by radiolytically-produced Zn+ species. Overall, the reported findings demonstrate the richness and complexity of chemistry involving the interactions of ionizing radiation with molten salts.

Graphical abstract: Radiation-induced reaction kinetics of Zn2+ with eS− and Cl2˙− in Molten LiCl–KCl eutectic at 400–600 °C

Supplementary files

Article information

Article type
Paper
Submitted
11 Mar 2022
Accepted
09 May 2022
First published
05 Jul 2022

Phys. Chem. Chem. Phys., 2022,24, 25088-25098

Radiation-induced reaction kinetics of Zn2+ with eS and Cl2˙ in Molten LiCl–KCl eutectic at 400–600 °C

K. Iwamatsu, G. P. Horne, R. Gakhar, P. Halstenberg, B. Layne, S. M. Pimblott and J. F. Wishart, Phys. Chem. Chem. Phys., 2022, 24, 25088 DOI: 10.1039/D2CP01194H

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