Conclusions
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1.
In solid substitution solutions in the NiC-MgO system, obtained by coprecipitation of the hydroxides, the nickel is distributed nonuniformly, both because of enrichment of the surface layers in particles of the magnesium oxide component (“macroheterogeneity”) and because of clustering of the nickel(II) oxide (“microheterogeneity”).
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2.
The macroheterogeneity of the system decreases with increasing temperature of preliminary calcination; at 1100°, the content of nickel on the surface is the same as that in the bulk.
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3.
Nickel(II) oxide clusters of two types have been identified: small clusters (solid solution of NiO in MgO matrix with weak interaction between nickel ions) and large clusters (nucleated crystals of NiO in the structure of a solid solution of MgO in NiO).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 979–986, May, 1984.
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Dulov, A.A., Slinkin, A.A., Abramova, L.A. et al. Physicochemical properties and activity of Nio-Mgo catalysts. Russ Chem Bull 33, 900–906 (1984). https://doi.org/10.1007/BF01141692
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DOI: https://doi.org/10.1007/BF01141692