Conclusions
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1.
The formation of zinc-chromium catalysts with various chromic anhydride contents were studied by the method of thermal chromatography.
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2.
Zinc-chromium catalysts eliminate water in two steps during heating in inert medium, followed by step-wise decomposition of the series of zinc chromates formed during preparation to a spinel phase of zinc chromite. The content of nonstoichiometric oxygen was calculated.
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3.
The process of formation of zinc-chromium catalysts in a reducing medium consists of an easier and more profound step-wise elimination of oxygen; the spinel phase of zinc chromite is formed at a substantially lower temperature in reducing medium. Considering the results obtained, the literature data on the topochemical reactions that occur during processes of formation of zinc-chromium catalysts are discussed.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No.5, pp. 1065–1072, May, 1969.
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Yakerson, V.I., Golosman, E.Z. & Shutov, Y.M. Investigation of the formation of catalysts by the method of thermal chromatography. Russ Chem Bull 18, 973–978 (1969). https://doi.org/10.1007/BF00922852
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DOI: https://doi.org/10.1007/BF00922852