1824.  KEITH, P. C., AND RIBLETT, E. W. (Hydrocarbon Research, Inc.). Hydrocarbon Synthesis. United States Patent 2,564,696, Aug. 21, 1951; appl. filed Dec. 3, 1946, Serial No. 713,838; 9 claims (Cl. 260-449.6).

In maintaining the activity and selectivity of a fluidized Fe catalyst having a relatively minor alkali content as promoter, the latter is supplemented periodically by injecting a solution of an alkali metal compound, preferably K₂CO₃, directly onto the fluidized catalyst thereby restoring its selectivity and activity for the production of normally liquid hydrocarbons.