Lewis Acidity and Basicity Diagnostics of Molten Salt for its Properties and Structure Online Monitoring
arxiv(2024)
摘要
Analogous to the aqueous solution where the pH of the solvent affects its
multiple behaviors, the Lewis acidity-basicity of molten salts also greatly
influences their thermophysical and thermochemical properties. In the study, we
develop ion probes to quantitatively determine the acidity-basicity scale of
molten NaCl-xAlCl3 (x = 1.5-2.1) salt using in-situ ultra-violet visible
(UV-Vis) spectroscopy. With the accumulation of acidity-basicity data of
NaCl-AlCl3 molten salt for a variety of compositions, the correlation between
the acidity-basicity of salt and its measured fundamental properties are
derived. To understand the physical and chemical features controlling the
acidity-basicity variations, the structures of NaCl-xAlCl3 molten salts with
different chemical compositions are investigated in terms of bonded complexes
and coordination numbers. The comprehensive understanding of the correlation
between composition, acidity-basicity, properties, and structures of molten
salt can serve for the full screening and online monitoring of salt melt in
extreme environments by simply measuring the salt acidity-basicity as developed
in this study.
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