2024/06/19 by Changzu Zhu, Zhu, Changzu, Jia Song +17
Chemical Engineering · Engineering · #Extraction and Separation Processes #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Molten salt chemistry and electrochemical processes
paper · pdf · doi:10.48550/arxiv.2406.13368
openalex publication_date 2024/06/19 · openalex created_date 2024/06/22 · openalex updated_date 2026/07/28
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.