Chemical Reaction Engineering
The units of frequency factor in Arhenious equation

Are the same as those of the rate constant
Are cycles per unit time
Depend on the order of the reaction
Depend on temperature, pressure etc. of the reaction

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

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

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