Conclusions
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1.
The use of model samples with a high concentration of nickel allows obtaining reliable information on the processes which take place on the surface of cracking catalysts.
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2.
The surface concentration of nickel, the character of the distribution over the surface, the size of the particles, and the chemical state are strongly dependent on the nature of the matrix of the catalyst. In an aluminosilicate matrix with a high concentration of aluminum oxide, nickel is basically in the form of an aluminate, while it is in the form of an oxide on silica, and nickel silicate is virtually not formed.
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3.
The reaction of Ni with the RSG-6Ts catalyst results in its relatively uniform distribution on the surface and the high stability of the applied phase dispersion; on the contrary, large crystals of NiO are formed in the absence of the reaction (Ni/SiO2).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2678–2684, December, 1988.
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Stakheev, A.Y., Grigoryan, A.A., Shpiro, E.S. et al. Study of processes of deactivation of cracking catalysts by heavy metals and mechanism of their passivation. Russ Chem Bull 37, 2409–2414 (1988). https://doi.org/10.1007/BF00952606
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DOI: https://doi.org/10.1007/BF00952606