In　this　study,　to　investigate　the　mass　transport　characteristics　in　a　structured　porous　medium　with　porous　particles　under　an　interfacial　concentration　discontinuity,　a　macroscopic　solute　transport　equation　is　proposed　based　on　the　volume　averaging　theory.　A　typical　three-dimensional　geometry　(a　body　center　cubic　arrangement　of　spheres)　was　chosen　as　the　representative　elementary　volume.　The　corresponding　closure　problem　was　solved　to　obtain　the　longitudinal　mass　dispersion.　Based　on　the　numerical　results,　a　new　correlation　of　the　longitudinal　mass　dispersion　for　a　structured　porous　medium　with　porous　particles　is　presented.　Through　a　comparison　with　the　correlation　of　the　longitudinal　mass　dispersion　for　a　random　porous　medium,　it　can　be　determined　that,　for　a　mechanical　dispersion,　the　dependence　of　a　random　porous　medium　and　that　of　a　structured　porous　medium　on　the　Peclet　number　Pe　are　linear　and　quadratic,　respectively.　Furthermore,　it　was　also　determined　that　for　a　holdup　dispersion,　a　structured　porous　medium　is　less　dependent　on　the　ratio　of　diffusivity　of　the　fluid　phase　to　the　diffusivity　of　the　porous　particle　phase.　In　addition,　it　is　more　dependent　on　the　inverse　ratio　of　the　solubilities　of　the　solute　in　the　fluid　and　in　the　catalyst　particles　than　in　a　random　porous　medium.　(C)　2019　Institution　of　Chemical　Engineers.　Published　by　Elsevier　B.V.　All　rights　reserved.