As you know some MOFs are flexible and the way the flexible MOF behaves toward external stimuli such as temperature, pressure can affect their diameter (e.g., breathing) and many other physical properties.
How these changes can be related to the diffusion coefficient as it depends on catalyst diameter?
The concept of internal and external mass transfer can be applied to MOFs as well as to any other material. The variation in the pore diameter as a function of temperature, pressure and chemical environment will result in a variation of the diffusion coefficient (and thus affect the extent to which internal mass transfer will limit the overall catalytic activity)
Dear Noor Aljammal
De diffusivity of the reactive specie depends of the solvent (nussel Difusivity) and the catalyst contribute with the effective diffusivity according the porosity and tortuosity.
Please read my article: La-, Mn-and Fe-Doped Zirconia Washcoats Deposited on Monolithic Reactors via Sol-Gel Method: Characterization and Evaluation of their Mass Transfer Phenomena and Kinetics in Trichloroethylene Combustion 2017International Journal of Chemical Reactor Engineering
15(5),20170027, where I calculated both types of diffusivities.
The heat transfer is analogous.
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