523. ------. [DREYFUS, H.] [Catalytic Production of Ketene.] French Patent 617,428, Feb. 19, 1927; appl. filed June 11, 1926. Chem. Zentralb., 1927, I, p. 2686.

Patent Abstracts

Mixtures of CO and H₂ in proportions of about 3:1 are passed at 200°-300° and 50-150 atm. over catalysts of CuO and Cu and Zn chromate.