Letter | Published:

Activity of the Chromium-Aluminium Oxide Catalyst System in the Nitrile-Diene and n-Heptane Cyclizations

Naturevolume 168pages387388 (1951) | Download Citation



THE chromium–aluminium oxide catalyst system is one most commonly used in the aromatization of paraffinic hydrocarbons. In practice, mixtures containing up to 20 per cent chromium oxide are used, this being regarded as the region of greatest catalytic activity. The work of Eischens and Selwood1 on this catalyst system established the close relation between the activity, magnetic susceptibility, and state of dispersion of the chromium oxide on the alumina. It was shown that at low chromium oxide content, the chromium oxide aggregates into clusters or islands which build up into two and even three layers in thickness, and which have high magnetic susceptibility and high catalytic activity.

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  1. 1

    Eischens, R. P., and Selwood, P. W., J. Amer. Chem. Soc., 70, 2271 (1948).

  2. 2

    Hawkins, P. J., and Janz, G. J., J. Chem. Soc., 1485 (1949).

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  1. Walker Laboratory, Department of Chemistry, Rensselaer Polytechnic Institute, Troy, N.Y.

    • G. J. JANZ
    •  & P. J. HAWKINS


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