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Physicochemical and corrosive properties of the oxidation catalysts based on solutions of Mo–V–Р-heteropoly acids

https://doi.org/10.18412/1816-0387-2010-2-

Abstract

Modified aqueous solutions of Mo–V–Р-heteropoly acids (HPA) are used as high-performance catalysts in processes of oxidation of various classes of organic compounds with dioxygen. The process of oxidation of n-butenes to methylethylketone (MEK) in the presence of aqueous (6·10-3 M Pd + 0.25 M HPA-7’) solution, where HPA-7’ is a modified HPA having overall composition Н12P3Mo18V7O85, is of considerable industrial interest. In the 1st stage, the oxidation of n-C4H8 into MEK in the presence of Pd takes place. In the 2nd stage, the catalyst is regenerated with dioxygen of air, closing the catalytic cycle. In such two-stage redox processes the HPA solutions are reversible oxidants, and their physicochemical properties are continuously varied. The modified HPA solutions are attractive because of their thermal stability and increased rate of regeneration. However, there is no information about their physicochemical and corrosive properties as yet. Doubtlessly, it hardly retards commercial development of these processes. Using the 0,5 M HPA-7’ solution as an example, we have shown how physicochemical properties of the catalyst change. It is found that pH, density (ρ), and viscosity (η) of this solution increase in the 1st stage and reach their maxima, but its redox potential (E) comes up to its minimum. In the 2-nd stage, the E value increases, but the pH, ρ, and η values decrease and reach their initial values. Thus, in the processes involving alternate reduction and oxidation of the catalyst based on the HPA solution, all alterations of its physicochemical properties are completely reversible. The data about corrosive properties of the modified HPA-7’ solution in relation to different engineering materials first are obtained in this work. It is found that resistance of different engineering materials to corrosion in the HPA-7’ solution falls in the series Ti (~ 0,009 mm·year-1) > 06KhN28MDT > 10Kh17N13M2T > 12Kh8N10T >> KhN65MV (~ 0,68 mm·year-1). The unique ability of the modified Mo-V-P HPA solution to restore entirely their properties after their regeneration with dioxygen permits to use them in many-cycled processes during a long time. It opens real prospects for development of industrial oxidation homogeneous catalytic processes using the HPA solutions.

About the Authors

E. G. Zhizhina
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation


V. F. Odyakov
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation


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Review

For citations:


Zhizhina E.G., Odyakov V.F. Physicochemical and corrosive properties of the oxidation catalysts based on solutions of Mo–V–Р-heteropoly acids. Kataliz v promyshlennosti. 2010;(2). (In Russ.) https://doi.org/10.18412/1816-0387-2010-2-

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