3988.  YARNALL, W. A. (The Texas Co.). Treatment of Hydrocarbons. United States Patent 2,257,082, Sept. 23, 1941; appl. filed Mar. 18, 1939 (Cl. 260-683). Chem. Abs., vol. 36, 1942, p. 91.

Olefins are formed from normally gaseous hydrocarbons and low boiling liquid hydrocarbons by contacting the hydrocarbons at low pressures and at temperatures of about 350°-600° in the vapor phase and in presence of a substantial amount of CO with a mixture of catalysts including a dehydrogenation catalyst such as Al₂O₃-Cr₂O₃ and catalyst strongly promoting the interaction of CO and H₂ in the ratio of 1:2, such as the oxides of Co, Mg, and Th.