Sorption and structural properties of the sequentially precipitated nickel-chromium hydroxides Original Research Article

The principles of changing texture of co-precipitated double nickel-chromium hydroxides at constant pH value treated at the stage of hydrogel with meta-silicate, tungstenate, molybdate and meta-vanadate anions were investigated in this paper. The BET surface area, total sorption pore volume and pore size distributions were determined from H2O, CH2Cl2, CHCl3, and CCl4 vapour sorption isotherms measured gravimetrically. The development of the gels ultramicro and mesoporosity and the growth of their surface areas appear to have been largely controlled by the mode of replacement of interlayer anions by species studied. Sample specific surface areas determined from H2O vapour sorption were equal to 193 × 103–492 × 103 m2kg−1. It was shown that all the xerogels dried at 393 K have both double metal layered hydroxide structure and X-ray amorphous phase. There is a combination of two and three dimensional porosity in texture of materials obtained was supposed.