Bull. Russ. Acad. Sci. Div. Chem. Sci. (Engl. Transl.) p. 612 - 618 (1992)
Update date:2022-08-12
Topics:
Kharlamov, V. V.
Garanin, V. I.
Karakhotin, S. N.
Minachev, Kh. M.
Hydrogenation of cyclohexene has been studied under pressure in a flow reactor on the following catalysts: Na- and H-forms of Y-type zeolites, erionite, magnesium and lanthanum oxides, palladium on silica and aluminum oxide.This reaction is accompanied by skeletal isomerization to give methylcyclopentane and methylcyclopentenes.The differences in activation energies for isomerization and hydrogenation reactions were estimated as 83-96 kJ/mole for NaY and Na,K-erionite, 33-50 kJ/mole for the H-forms of the zeolites, 33-37 kJ/mole on the Pd catalysts, and 25-33 kJ/mole on magnesium and lanthanum oxides.It is suggested that the cyclohexyl complex, formed as an intermediate during hydrogenation of cyclohexene on Na-forms of the zeolites, is neither a carbocation nor a radical. Keywords: cyclohexene, zeolites, hydrogenation.
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