Abstract
Ultrafine zirconia particles were prepared by hydrolysis of zirconium tetrabutoxide in micro water pools of reversed micelles formed with a novel surfactant, dioleyl phosphoric acid. By repeating a dipping-firing cycle, the mesopores of a γ-alumina membrane were packed with the zirconia particles. The gas permeability of the membrane was dependent on the conditions of particle formation and calcination. The former affected the size of the zirconia particles, and the latter influenced the removal of carbonaceous matters and the sintering of the particles. The permselectivity of hydrogen to nitrogen increased with repetition of the impregnation cycle, and exceeded a value of 4.5 after six cycles, the initial value being 3.4. The membrane was stable up to at least 800 K.
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