3821.  ----- [VESTERDAL, H. G]. (Standard Oil Development Co.). Reactivation of Catalysts Containing Iron. United States Patent 2,541,680, Feb 13, 1951; appl. filed Nov. 20, 1947, Serial No. 787,259; 3 claims (Cl. 252-416). Chem.. Abs., vol. 45, 1951, p. 6653.

K promoted Fe oxide catalyst that has been used in a dehydrogenation reaction may be reactivated in situ. The catalyst is allowed to cool to 200°-500° F.; then a stream of gas containing CO is passed through the catalyst for 0.5-5 hr. The CO-containing gas is cut off, and the temperature of the catalyst is raised >1,000° F. The gas-feed rate is not important. The pressure may be above atmospheric. Since the rise in catalyst temperature should be as rapid as is feasible and since the reaction should contain steam at the beginning of the productive phase, steam is passed through the catalyst after the CO is cut off. 6 United States patents cited.