1786.  JONES, W. H., LONG, F. M., AND KREBS, R. W. (Standard Oil Development Co.). Method of Regenerating Hydrocarbon Synthesis Catalyst. United States Patent 2,541,654, Feb. 13, 1951; appl. filed June 3, 1947, Serial No. 752,250; 10 claims (Cl. 260-449.6). Chem. Abs., vol. 45, 1951, p. 5392.

In initial stages of the synthesis reaction the catalyst has a relatively high weight of O as compared to C. As the reaction progresses the weight % of C increases. In accordance with the invention, the catalyst is withdrawn from the synthesis zone when the weight % of C is 2-3 times the weight % of O. The catalyst is treated in a relatively O₂-free atmosphere as in a N₃ atmosphere. The C may be reduced by using the O₂ present in the catalyst. The regenerated catalyst, which is also a reduced catalyst, is returned directly to the synthesis zone. The process is particularly applicable when using a synthetic ammonia catalyst, Fe₃O₄ containing 1.5% K₂O and about 3% Al₂O₃. 6 United States patents cited.