Abstract
The difference between the effective diffusivity of a cylindrical porous catalyst under reacting conditions, DeR, and non-reacting conditions, DeD, was studied experimentally and theoretically (on the basis of the pore model). It was concluded that the value** of DeR substantially agrees with that of DeD. But the apparent of DeR obtained experimentally was greatly affected by the non-uniformity of the catalyst pellet, that is, the local value of DeD was non-uniform. Especially when the reaction was carried out in the intraparticle diffusion limited region, DeR apparently became much smaller than DeD.
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