Thoriumdioxide was selected as a second promoter for nickel catalyst in addition to chromium oxide which was proved to be suitable to accelerate the H/D isotopic exchange reaction between hydrogen and water vapour. A series of Ni/Cr2O3/ThO2catalysts were prepared by the co-precipitation technique. The amount of Ni was 70 … 90 mol%, while that of Cr2O3was 0 … 20 mol% and that of ThO2ranges from 0 … 30 mol%. This type of catalysts is sensitive for water condensation on its surface. The total surface area, total pore volume and pore radius of the catalysts were calculated from nitrogen adsorption on their surfaces at 77 K and application of the BET-equation.