Abstract
An industrial catalytic reforming unit was simulated, accounting for the fractal morphology of the internal surface of the porous PtRe/Al 2O 3 catalyst. The reaction network consists of 86 reactions, with Hougen-Watson kinetics between 29 lumps. Diffusion and reaction inside the catalyst particles was rigorously simulated, solving the complete set of continuity equations and Stefan-Maxwell equations for 3ulticomponent diffusion by orthogonal collocation. The influence of the fractal morphology on the Knudsen diffusivities was calculated using a fractal perturbation technique. Reactor profiles, as well as intraparticle profiles, are simulated within a reasonable CPU time, so that approximations using the generalized Thiele-modulus are unnecessary. Comparison between the results for smooth and fractally rough catalyst surfaces shows convincingly that the fractal surface morphology has a significant impact on the yields and product distribution.
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