PATENTS

2833. ----- [ROTTIG, W.]  (Ruhrchemie A. G.).  [Process for the Aromatization of Hydrocarbons.]  German Patent 736,839, May 20, 1943; appl. R 104,540, R 433, filed Feb. 14, 1939 (Cl. 23 b-1.04).  TOM Reel 37. bag 3451, item 35; TOM Reel, bag 2,744, item 14, 3 pp.;  Chem. Abs., vol. 38, 1944, p. 2965.

            Aliphatic mixtures with 6-12 C atoms in the molecule, such as the synthetic gasoline produced by  the reduction of CO by H2 at normal pressure, are aromatized by being passed at elevated temperatures over catalysts consisting of Al2 O3  Cr2O3 and Mn and Th compounds as activators.  The catalyst contains about 30% of Cr2O3 and in additional small amounts of Co, Ni, or both.  These catalysts have greater mechanical stability and higher activity than those consisting of 30-50% Cr2O3 on MgO described in German Patent 763,831  (abs. 3004).