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4. Diffusion and Reaction in a Porous Catalyst (calculation) Assume you have a porous catalytic wall of thickness L. The left side of the wall, at x = 0, is impermeable. The right-side, at x = L, is an interface with gas where reactant A diffuses in. The concentration of A at this interface is Co. Assume that species A is consumed in the reaction A - B and has an effective diffusion coefficient Deft within the catalyst membrane. Let a' be the available catalytic surface per unit volume. (a) Determine the concentration profile C.(x), in terms of a Thiele modulus. (b) Determine an effectiveness factor for this catalytic system