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NDSU Chemistry



Adsorption Dynamics - The King and Wells Method

KW Example

What information do we obtain here?
This rather simple technique allows us to determine the very details of energy transfer processes which determine the reactivity of a catalyst surface.
The shape of the adsorption probability curves allows to distingish different adsorption scenarios.
This information is required to set up kinetic models of surface reactions.

How does it work?
The King and Wells method is the best and most widely applied experimental procedure to determine adsorption probabilities. Adsorption probailities are determined experimentally by directing a well-collimated beam of particles onto the surface and by detecting simultaneously (as a function of exposure/time) the total change of the gas pressure in the measuring chamber. This simple measuring procedure – titration of free surface sites by the adsorbate – leads to a precise determination of adsorption probabilities.