The behavior of non-isothermal fixed-bed reactor performing hydrogen peroxide decomposition by immobilized Terminox Ultra catalase attached onto the outer surface of glass beads was studied. A dispersion model for bioreactor formulated in this work took into account the coupled mass and heat balances as well as the rate equation for enzyme parallel deactivation. Model under consideration was based on kinetic, hydrodynamic and mass transfer parameters previously obtained in the H₂O₂ decomposition. The effect of inlet hydrogen peroxide concentration, feed temperature and diffusional resistances were analysed. It was shown that in process under considerations the external diffusional resistances should not be ignored compared to internal one and global effectiveness factor should be employed. Furthermore, the optimal feed temperature was obtained that maximizes the average hydrogen peroxide conversion at bioreactor outlet.

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