1662. ------. [INTERNATIONAL HYDROCARBON SYNTHESIS CO.] [Diatomaceous Earth as Catalyst Support.] Netherlands Patent 52,657, June 1942. Chem. Abs., vol. 41, 1947, p. 3934.

To render calcining possible without sintering, the diatomaceous earth is first treated with acids b. 120º or < and then calcined at 500º-550º instead of > 600º as was usual for the synthesis of hydrocarbons from CO and H₂.