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• W2116713277 abstract "The influence of inlet gas concentration cycling on the optimal temperature policy of catalytic transport reactors is studied theoretically. The model considered is based on plug flow of gas and catalyst particles with negligible interand intra-particle diffusional resistances and concentration dependent deactivation kinetics. To utilise the concentration of the reactant and the activity of the deactivating catalyst fully a proper temperature sequence along the reactor is needed. Thus, a general optimal temperature policy using the continuous minimum principle is derived for the reactor under periodic operation. The model equations are solved analytically for gas concentration, activity and temperature profiles. Resonance behaviour (maximum in conversion with pulse width) is obtained using the optimal temperature policy for certain sets of parameters. The effects of activation energy groups, reaction and deactivation constant groups and inlet temperature on the optimal temperature policy under periodic operation are evaluated. In all cases an improvement in conversion with the optimal temperature policy under periodic operation over that with an isothermal policy under periodic operation is obtained. A suboptimal policy, comprising constant temperature over different reactor sections, which is useful for implementation purposes is also discussed.On a etudie de rnaniere theorique l'influence du gaz d'entree en recyclage sur la strategie de temperature optimale pour des reacteurs a transport catalytique. Le modele propose est base sur l'eoulement piston de particules de catalyseur et du gaz avec des resistances diffusionnelles inter et intra-particulaires negligeables et une cinetique de desactivation dependante de la concentration. Afin d'utiliser pleinement la concentration du reactif et l'activite du catalyseur de desactivation, un profil de temperature approprie est neessaire le long du reacteur. A cette fin on a etabli une strategie generale de temperature optimale basee sur le principe du minimum continu pour un reacteur fonctionnant en mode harmonique. Les equations du modele sont resolues de maniere analytique pour les profils de concentration du gaz, d'activite et de tempeature. Le comportement en resonance (maximum de conversion avec la largeur d'impulsion) est obtenu a l'aide de la stratkgie de temperature optimale pour certains jeux de parametres. On a evalue les effets des groupes de l'energie de desactivation, de constantes de desactivation et de reaction, ainsi que les effets de la temperature d'entree sur la strategie de temperature optimale en mode harmonique. Dans tous les cas, on obtient une amelioration de la conversion avec la strategie de temperature optimale par rapport a une strategie isotherme pour un mode harmonique. Une strategie sous-optimale en partie basee sur une temperature constante a differentes sections du reacteur et utile sur le plan pratique est egalement etudiee." @default.
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• W2116713277 date "1988-08-01" @default.
• W2116713277 modified "2023-09-28" @default.
• W2116713277 title "Optimal temperature policies for catalytic transport reactors under periodic operation" @default.
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• W2116713277 doi "https://doi.org/10.1002/cjce.5450660413" @default.
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