Abstract
Phase and structural changes accompanying the thermal dehydration of crystalline Ni(OH) 2 were followed by differential thermal analysis, thermogravimetric analysis, and X-ray diffraction techniques. The isothermal dehydration of the hydroxide was studied at various temperatures in air and in vacuo. Adsorption isotherms of nitrogen, carbon tetrachloride, and cyclohexane were measured on the hydroxide and its dehydration products formed in air at temperatures ranging from 35–500 °C, and in vacuo at 250 °C. Application of the BET theory reveals that the surface area of the oxide decreases with the increase of the size of the adsorbate molecule. Carbon tetrachloride seems to be reduced on the oxide formed in vacuo (deoxygenated). Nitrogen adsorption isotherms were investigated by the t method. Pore volume distributions were calculated from desorption isotherms of nitrogen.
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