Chemistry and Electrochemistry in Aluminum Chloride Molten Salt Systems,
COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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The 11 AlCl3-NaCl system at 175 C may be considered as NaAlCl4- with the dominant acid-base equilibrium given by 2 AlCl4- in chemical equilibrium with Al2Cl7- Cl- Km 1.06 x 10 to the -7th power. A number of organic solutes, particularly amines, have been studied. It was found that the radical cations of triphenylamine and N,N-dimethyl-aniline DMA are stabilized in the melt, with the stability clearly depending on the acidity of the melt. The oxidation of N,N,N,N-tetramethylbenzidine TMB was studied a chemical transformation of the dicomplexed amine to a monocomplexed amine precedes the oxidation of TMB. Sulfur has been quantitatively reduced in both acid and basic melts at 175 C. The solubility of metal sulfide in the system is dependent on the acidity of the melt. The sulfur electrode process appears to be S2 4e in chemical equilibrium with 2S2-.
- Physical Chemistry