Catalytic Properties of Heteropolytungstates with 3d Elements and Their Thermolysis Products

Abstract

The catalytic properties of the potassium salts of heteropolytungstates with the general formulas K_m[X₂W₁₁(H₂O)O₃₉] (X = Fe³⁺, Co²⁺, and Zn²⁺) and K₅[H₂W₁₁Cr(H₂O)₂O₃₈] with the Keggin anion structure and K_n[XH_nW₆O₂₄] (X = Ni²⁺ and Mn⁴⁺) with the Anderson anion structure and their thermolysis products were studied in the reaction of isopropanol oxidation to acetone by atmospheric oxygen. Changes in their catalytic properties depending on their constituent 3d elements were established. The test heteropolytungstates and the thermolysis products of their potassium salts—phases with the structures of the types of pyrochlore and hexagonal tungsten bronzes—are promising compounds for the preparation of catalysts for organic synthesis reactions. The results of the studies can be useful for the prognostication of the properties of new catalytic systems based on these compounds.