1860.  KIRSHENBAUM, I., AND KEARBY, K. K. (Standard Oil Development Co.). Hydrocarbon Synthesis Catalyst. United States Patent 2,553,415, May 15, 1951; appl. filed Oct. 1, 1947, Serial No. 777,373; 13 claims (Cl. 260-449.6).

Fluidizable Fe catalysts of good stability are obtained by combining Fe in the form of its carbonate with a metal carbonate base, which in itself exhibits a high stability, and then reducing the composite material. A distribution of about 5-40% by weight of FeCO₃ and about 60-90% by weight of the carbonate of a Group II metal is preferred. The catalyst may be prepared by precipitating FeCO₃ on precipitated metal carbonate support and then reducing the material. Such a catalyst, particularly one comprising BaCO₃ and/or CaCo₃, is claimed to work well even in the absence of conventional catalyst promoters. 4 United States patents and 1 foreign patent cited.