Conclusions
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1.
The selectivity of the investigated Ni-Cr2O3 catalysts in the dehydrogenation of cyclohexane increases sharply (a decrease in the CH4 content) when additions of CuO, ZnO, and Ag2O are introduced.
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2.
The selectivity of Ni-Cr2O3 catalysts and catalysts with additives is not associated with the presence of a volume phase of NiO, but is due to surface oxygen at the metal-carrier interface.
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3.
A mechanism for the action of selectivizing additives, based on an increase in the mobility of the oxygen found at the interface, which leads to its removal from the surface of nickel, has been suggested.
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4.
The specific catalytic activity of Ni-Cu-Cr2O3 catalysts is greater than the specific activity of Ni-Cr2O3 catalysts.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp.2385–2391, November, 1971.
The x-ray diffraction picture of the catalysts were taken by D. P. Shashkin, to whom the authors would like to express their gratitude.
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Slinkin, A.A., Fedorovskaya, E.A., Pribytkova, N.A. et al. Structure and activity of Ni-Cr2O3 and Ni-Cu-Cr2O3 Communication 3. Activity and selectivity in the dehydrogenation of cyclohexane. Russ Chem Bull 20, 2267–2272 (1971). https://doi.org/10.1007/BF00854293
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DOI: https://doi.org/10.1007/BF00854293