Abstract
The behavior of an non-adiabatic, non-isothermal fixed-bed reactor used for the hydrogenation of toluene has been studied under the influence of catalyst deactivation caused by continuous addition of thiophene to the reactant feed. Axial and radial temperature and concentration profiles were measured during deactivation. In spite of significant radial temperature gradients (Biot number = 5.25), it was possible to describe the reactor behavior with a one-dimensional pseudohomogeneous model. Mean cross-sectional temperatures can be used since the measured radial profiles are parabolic. The activation energy for thiophene adsorption derived from the measured profiles (4.7 kJ/mole) agrees with previous direct determinations in the literature.
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