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 ²multipoint² adsorption on weak Bronsted and Lewis acid sites of the oxide

doi.org/10.32737/0005-2531-2022-1-22-28