Abstract
Experimental measurements and modelling studies have been made for the regeneration of fixed beds of coked chromia—alumina particles. The catalyst was coked initially by the dehydrogenation of butene. Temperature profiles obtained during regeneration were found to exhibit steep gradients and sharp maxima unlike those observed during regeneration of other coked catalysts such as silica—alumina or zeolite-cracking catalyst. A mathematical model has been developed and solved using the method of orthogonal collocation on finite elements. This method has enabled the steep temperature gradients in the reactor to be simulated whereas the global collocation technique either fails or requires a very large number of collocation points The modelling results gave excellent agreement with the experimentally obtained temperature and coke profiles.
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