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# The irreversible, first-order reaction A -gt; products takes place over catalyst X, which is a porous solid. The intrinsic rate constant is 1500 s...

The irreversible, first-order reaction A -> products takes place over catalyst X, which is a porous solid. The intrinsic rate constant is 1500 s-1. The effective diffusivity of A is 2*10-3 cm2s-1 . The commercial version of catalyst X will be sperical in shape. What is the largest radius that can be used if the effectiveness factor must be 0.9 or geater? Also, compare the results from the Thiele modulus and effectiveness factor that uses RP as the characteristic length scale to the generalized forms that use VP/SP as the characteristic length scale.