Conclusions
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1.
Below 500°C, hydrogen at 100 torr pressure will not reduce Re(VII) to metallic rhenium on the aluminum oxide surface; on the silica gel surface, the reduction to metallic rhenium is complete under these same conditions.
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2.
The degree of reduction of the rhenium catalyst depends on the nature of the rhenium compound used in its preparation, the concentration of the rhenium in the catalyst, and the pressure of the hydrogen. Raising the rhenium concentration and increasing the hydrogen pressure reduces the temperature required for rhenium reduction, and increases the degree of reduction, on the aluminum oxide surface.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2448–2454, November, 1977.
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Dmitriev, R.V., Avaev, V.I., Ryashentseva, M.A. et al. Certain aspects of the reduction of Re/γ-al2O3 and Re/SiO2 catalysts by hydrogen. Russ Chem Bull 26, 2269–2274 (1977). https://doi.org/10.1007/BF00958708
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DOI: https://doi.org/10.1007/BF00958708