Aluminum ceramics with a high content of α–Al₂O₃ (ca. 97%) was analysed as a potential support for immobilized cells of Saccharomyces cerevisiae catalysing the process of ethanol fermentation. The study demonstrated that the mechanism of yeast immobilization consisted mainly in trapping the cells in the internal pores of the support and not on the adsorption surface. The presence of aluminum ions (a factor facilitating surface adsorption) in a suspension of yeast diminished adsorption capacity of the examined material. The amount of biomass bound by the support depended on the time of immobilization and yeast concentration in the solution (the porous material was immersed in). Immobilization of cells in porous aluminum ceramics did not evoke a reduction in their fermentation activity – dynamics of batch fermentation was similar to that of fermentation with free cells run under identical conditions.