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 1

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 Al₂O₃ 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).