Conclusions
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1.
In the presence of Rh-C catalyst the hydrogenation of 1,4-cyclohexadiene proceeds in two consecutive steps: initially at a constant rate to cyclohexene, and then to cyclohexane. The cyclohexene is adsorptionally displaced by the diene.
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2.
The kinetic curve for the overall process passes through a maximum, which is due to the fact that the rate of saturating the diene is lower than the initial rate of hydrogenating the formed cyclohexene.
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3.
The hydrogenation of 1,4-cyclohexadiene is accompanied by a slight disproportionation of its hydrogen. The formed benzene exerts an inhibiting effect as regards the conversion of cyclohexadiene and cyclohexene, which effect is greater the higher the benzene concentration in solution.
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L. Kh. Freidlin and I. L. Popova, Izv. Akad. Nauk SSSR, Ser. Khim., 1514 (1968).
L. Kh. Freidlin, Yu. Yu. Kaun, E. F. Litvin, and T. M. Ilomete, Dokl. Akad. Nauk SSSR,143, 883 (1962).
P. Cadiot and W. Chodkiewicz, Bull. Soc. Chim. France,18, 457 (1951).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 905–909, April, 1972.
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Freidlin, L.K., Popova, I.L. Study of the hydrogenation of 1,4-cyclohexadiene on Rh-C catalyst. Russ Chem Bull 21, 858–860 (1972). https://doi.org/10.1007/BF00854487
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DOI: https://doi.org/10.1007/BF00854487