2848.     ---------------.  [ROELEN, O.]  [Determination of the Content of Free Metal in Catalysts.]  FIAT Reel K-20, frames 32-37, 1938; PB 70,211; TOM Reel 287.

        Co catalysts are not reduced completely; unreduced oxide and carbonate remain.  The determination of the proportion of reduced metal is based on the fact that only the reduced metal, when mixed with H2SO4, develops an equivalent amount of H2, which is measured.  By determination of the total amount of Co used, the proportion of reduced metal can be calculated.  Care must be taken that the N2 used for the catalyst is free from O2 and that the H2 adsorbed on the catalyst is sucked off beforehand in the vacuum.  Details, with sketch of apparatus.