A Change in the Specific Conductance of Solutions of High-Vanadium Heteropoly Acids in Redox Processes

Changes in the values of specific conductance chi of the solutions of high-vanadium Mo-V-P heteropoly acids (HPA-) in redox processes are determined for the first time for the HPA-7 solution of the overall composition H10P3\Mo18V7O84, which is a highly efficient catalyst for oxidation processes. The dependences of chi on [HPA-7] at different temperatures and degrees of reduction m and the dependence of chi on m, are found. The relationship between chi and the equilibrium composition of the HPA-7 solution is shown. It was confirmed that the regenerated HPA-7 solutions completely restore their conductance and other physicochemical properties (redox potential E, density, viscosity, and pH), thereby proving the high stability as homogeneous catalysts of oxidative processes.