抄録
Activated carbons were synthesized from resorcinol-formaldehyde gel with and without Zn ions. The Zn ions were introduced into the gel through immersing the gel into the aqueous solution of Zn chloride. The gel without zinc ions was dried at 333K in an electric oven. The gel with the Zn ions was dried by two methods to examine the effect of immobilization method on the structure of carbonized sample (HD sample: dried at 333K in an electric oven, FD sample: dried by freeze dry). The dried gels were carbonized at 1173K for 4h in carbon dioxide. Adsorption and desorption properties of the carbonized samples for nitrogen and hydrogen at 77K were investigated. The pore structure of the carbonized samples was analyzed based on the adsorption isotherms of them for nitrogen at 77K. The effects of both the introduction of Zn ions and immobilization method of the introduced Zn ions in the gel (drying method) on the pore structure of carbonized samples were examined. The adsorption properties of carbonized samples for hydrogen were examined based on the pore structure of samples. The effectiveness of introduction of Zn ions and freeze dry of the gel with Zn ions was found to obtain the activated carbon with high specific surface area and high adsorption capacity for hydrogen at 77K.
