980.    ---------------.  [FISCHER, F., AND DILTHEY, P.]  [Effect of Different Carriers on the Synthesis of Benzine.]  Ges. Abhandl. Kenntnis Kohle, vol. 9, 1930, pp. 501-511; Chem. Abs., vol. 25, 1931, p. 3807.

      Satisfactory catalyst was prepared by depositing Fe and Cu (4:1) in the form of nitrates upon a suitable support.  Fe alone was unsatisfactory, as were Fe and Ag catalysts.  The reaction was carried out in Fe tubes, but unless these were treated with 5 N HNO₃ the catalyst lost its activity.  The contact materials lose activity by the accumulation of high-boiling substances, but neither extraction nor hydrogenation restored activity, which could only be achieved by combustion in a current of air.  Pt and Ru on an asbestos support proved an unsatisfactory catalyst.  The formation of unsaturated hydrocarbons was considered doubtful.