2858.     ---------------.  [ROELEN, O.]  [Sulfur Content in Solutions for the Preparation of Cobalt Catalysts.]  FIAT Reel K-29, 1939, frames 6,987-6,988; PB 70,218; TOM Reel 296.

        It is proved that a % of sulfate up to 8% in pure Co solutions in the preparation of Co catalysts does not reduce perceptibly the activity of the catalyst.  In the technical operation, however, one has to take into account a certain Ca content in the Co solutions, which causes, in connection with the H₂SO₄, a plastering and consequently a deterioration of the contact.  For this case, an activating washing with dilute alkali solution is recommended.