Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is reduced or the catalyst diffusivity is increased
Catalyst size is increased or the catalyst diffusivity is increased
Catalyst size is reduced or the catalyst diffusivity is reduced

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
All the adsorption does not take place by the same mechanism
Extent of adsorption is more than one complete monomolecular layer on the surface
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

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