Conclusions
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1.
Temperature ranges were found for the predominant physical adsorption or chemisorption of paraffin hydrocarbons and benzene on a reduced chromium silicate catalyst containing Cr2+ or Cr3+ ions. The dependence of chemisorption properties on the valence state of chromium was demonstrated.
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2.
The chemisorption of paraffin hydrocarbons and benzene on Cr2+ ions is dissociative and is accompanied by the release of hydrogen. The chemisorption activation energies increase with increasing molecular mass of the paraffin hydrocarbons. The chemisorption of the paraffin hydrocarbons on Cr3+ ions occurs at lower temperatures than for chemisorption on Cr2+ ions.
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3.
The temperature range from 20 to 100‡C, which features only the physical adsorption of the hydrocarbons, proved optimal for the purification of the hydrocarbons by the elimination of oxygen on chromium silicate chemisorbents containing Cr2+ ions.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1220–1223, June, 1988.
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Slovetskaya, K.I., Rubinshtein, A.M. Adsorption of hydrocarbons on a chromium silicate catalyst. Russ Chem Bull 37, 1071–1073 (1988). https://doi.org/10.1007/BF00961901
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DOI: https://doi.org/10.1007/BF00961901