The methods of thermal analysis – thermogravimetry, differential thermal analysis – were used to study the catalytic system phosphor-molybdenum heteropoly acid–aluminum oxide. It is shown that the modification of aluminum oxide has a direct effect on the state of the phosphor-molybdenum heteropoly acid. On the surface of ƞ-Al2O3, phosphomolybdic acid is destroyed by interaction with strong Lewis’s acid sites of the carrier, while on γ-Al2O3 it retains the individuality, probably due to multipoint adsorption on weak Bronsted and Lewis acid sites of the oxide

The results of thermodynamic calculations have showed that the condensation reaction of isopropyl alcohol with propylene, even at room temperature, is accompanied by complete transformation into the target product, di-isopropyl ether. At temperatures above 400 K, an almost equal degree of conversion of isopropyl alcohol to acetone and propylene, as well as the same temperature dependence of the equilibrium yield of reaction products, has been noted. Under conditions of parallel reactions of the conversion of isopropyl alcohol (with the exception of condensation with propylene), at 300 K theoretically, the most probable is the formation of di-isopropyl ether (38.28%) > propylene (16.75%) > acetone (12.32%), while at 400K and higher propylene (48.49%) > acetone (48.1%) > di-isopropyl ether (30.69%)