| Nitrogen adsorption phenomena of intermetallic compounds FeTi, which has execllent hydrogen-storage characteristics, were studied before and after activation. The specific surface areas of the unactivated and activated FeTi are 0.05 and 0.28m²g^(-1), respectively. The specific surface area of the activated FeTi is 5.6 times as large as that of the unactivated sample. Adsorption and desorption isotherms of the activated FeTi were obtained. Adsorption isotherm is similar to type B among the five types of isotherms classified by BDDT. Its hysteresis curve has the form of type B among de Boer`s five types of hysteresis. Desorption pore size analysis shows Chat the activated FeTi has very small quantity of mesopore whose radius is 20-80Å. The shape of adsorption isotherm and hysteresis curve, desorption pore size distribution analysis and SEM micrographs show that, the activated FeTi is nonporous powders with very small quantity of mesopore. The average adsorption rates of the activated FeTi show linear dependence on the nitrogen pressure at 77K. |
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