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The acidic properties and the catalytic activity of 12-molybdophosphates (Mx/nn+ H3-x PMo12O40;M = Cu2+, Bi3+, Cr3+ andX=1−3) have been studied. The results are discussed as the effect of these catalyst components on the partial charge on oxygen atom which is in a relation with the acidity. It is shown that the oxygen-hydrogen bond is weakened as the value of partial charge on oxygen (− δ0) becomes more negative, while the vapor-phase dehydration activity of 2-propanol was explained on the basis of the reacting zone wideness taking into account the pseudo liquid phase nature of the heteropoly compounds. A correlation of the percentage conversion of 2-propanol with the fractional charge on the molybdenum atom was successful to interpret the effect of the redox properties of these catalysts on their catalytic activity.ZusammenfassungEs wurden die sauren Eigenschaften und die katalytische Aktivität von 12-Molybdänphosphaten (Mx/nn+ H3-x PMo12O40;M = Cu2+, Bi3+, Cr3+ andX=1−3) untersucht. Die Ergebnisse werden bezüglich der Partialladung am Sauerstoffatom diskutiert, wobei gezeigt wird, daß die Sauerstoff—Wasserstoff-Bindung mit negativerem Sauerstoff schwächer wird, während die katalytische Dampfphasen-Dehydrierungsaktivität an 2-Propanol mit der Reaktionszone der pseudoflüssigen Struktur der Heteropolyverbindungen in Zusammenhang gebracht werden kann. Die Redox-Eigenschaften der Katalysatoren beim prozentuellen Umsatz der Reaktion von 2-Propanol sind direkt mit der fraktionellen Ladung am Molybdänatom zu korrelieren.

Action of salt formation on the bifunctional nature of 12-molybdophosphoric acid and their relationship to the catalytic activity