2945.     ---------------.  [RUHRCHEMIE, A.-G.]  [Manufacture of a Catalyst With High Cobalt Content and High Activity.]  FIAT Reel K-20, 1939, frames 40-43; PB 70,211; TOM Reel 299.

        Following has been found to be the most favorable method for precipitating the catalyst consisting of 100 part Co, 15 ThO₂, and 12.5 purified kieselguhr.  The boiling solution of 1 kg. Co and 150 gm. ThO₂, dissolved as nitrates in 20 l. of H₂O, is poured into the stirred boiling solution of 2.6 kg. soda in 40 l. H₂O.  After addition of 125 gm. previously purified kieselguhr, the mixture is stirred for another 30-40 sec.  The precipitate then is transferred to a suction filter, and the mother liquor is removed, after which the precipitate is covered 2 times with distilled H₂O and washed until less than 0.01 gm. soda per l. can be detected in the wash H₂O.  After extensive dry suction the cake is placed in the drier and dried at 100° for 8 hr.