Diffusion and Reaction in a Porous Structure

1 Diffusion and Reaction in a Porous Structure (Porous Catalyst Pellet) 

We consider a spherical catalyst particle and a simple reaction 

For diffusion in porous structures, the diffusion coefficient DeA has the form 

Changing the variable r in equation (5.50) to r/Rp for the pellet radius Rp yields 

Mass transfer across the boundary at the surface of the catalyst pellet 

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