Catalyst Regeneration Using a Shrinking Core Model
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The shrinking core model describes the behavior of a solid particle that shrinks by dissolution or reaction. This model has applications ranging from catalyst regeneration to coal particle burning and pills disolving in the stomach. Coking is a type of catalyst deactivation where carbon will build up in the catalyst and completely obstruct the catalyst's pores. Consider a gas-phase reactant (e.g. oxygen) reacting with a species (e.g. carbon) contained in an inert solid matrix (e.g. a catalyst). Carbon is removed from the outer edge of the pellet and then from the core of the deactivated catalyst particle. The dimensionless concentration of oxygen is given by:
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Contributed by: Housam Binous and Ahmed Bellagi (April 2011)
Open content licensed under CC BY-NC-SA
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[1] H. S. Fogler, Elements of Chemical Reaction Engineering, 3rd ed., Upper Saddle River, NJ: Prentice Hall, 1999.
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