Abstract

            The heteropolyocompounds Keggin-type, modified by exchanging the acidic proton of the heteropolyacid H₃PMo₁₂O₄₀ by counter-ions NH₄⁺ and Fe³⁺, or by substituting the addenda atoms Mo^VI by V^V,  Fe^III, were prepared and characterized by BET, XRD, IR, UV, SEM, TGA/DTA and ³¹P solid-state NMR spectroscopy techniques. The acidic properties were evaluated in the oxidative of decomposition of isopropanol. The catalytic performances of those compounds were tested in the isomerisation of n-hexane and in selective oxidation of methane to C1-oxegenates.

The experimental data (IR, Raman and XRD) indicated that compounds possess the Keggin structure.

TG curve shows that there are three steps of weight loss. DTA curve shows that the salts are thermally stable than the pure H₃PMo₁₂O₄₀ acid. The surface area , the acidic and the catalytic proprieties of heteropolyoxometalates depend considerably on the reaction conditions, and specifically on the chemical composition of the catalysts.

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