Conclusions
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1.
It has been shown that there is no correlation between the surface area of the nickel active in the hydrogenation of olefins on nickel-containing zeolites and the surface area determined from the chemisorption of oxygen. This lack of correlation is due to the fact that the reduction of Ni(II) is reversible, the equilibrium point being shifted toward Ni(II) in oxygen, inert gases, and benzene, and toward Ni(0) in olefins.
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2.
Nickel clusters embedded in the zeolite cavities are incapable of catalyzing the hydrogenation of benzene, the equilibrium point in the reduction of nickel cations being shifted toward the Ni(II) side.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 13–19, January, 1979.
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Romannikov, V.N., Ione, K.G. & Repina, V.V. The catalytic activity of nickel in type-Y zeolite catalysts for the hydrogenation of unsaturated hydrocarbons. Russ Chem Bull 28, 7–12 (1979). https://doi.org/10.1007/BF00925387
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DOI: https://doi.org/10.1007/BF00925387