Conclusions
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1.
The hydrogen pressure changes the selectivity of a 0.3% Pt-Al2O3 catalyst in the C6-dehydrocyclization of n-oetane: at 450°, when the hydrogen pressure was increased from 4.5 to 19.5 atm, the ratio of o-xylene to ethylbenzene formed increased on the average from 1.27 to 1.40.
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2.
By comparing the results obtained with the literature data, it was shown that the reactions of C6-dehydrocyclization of n-octane and hydrogenolysis of methylcyclopentane are covered by a single law: with increasing hydrogen pressure, the fraction of n-octane and methylcyclopentane molecules entering into the above-mentioned reactions with the carbon atoms with the least negative charges increases.
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3.
It is hypothesized that the direction of the reactions of C6-dehydrocyclization of n-octane and hydrogenolysis of methylcyclopentane is determined by the orientation of the molecules during adsorption and by the formation of a monoadsorbed complex by one carbon atom or another.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No.2, pp.300–307, February, 1973.
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Levitskii, I.I., Minachev, K.M. & Udal'tsova, E.A. Dependence of the directions of C6-dehydrocyclization of n-octane on the distribution of electron density in the molecule. Russ Chem Bull 22, 289–294 (1973). https://doi.org/10.1007/BF00850976
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DOI: https://doi.org/10.1007/BF00850976