Temporal Analysis of Products (TAP), (TAP-2), (TAP-3) is an experimental technique for studying
the kinetics of physico-chemical interactions 
between gases and complex solid materials, primarily heterogeneous catalysts. 
The TAP methodology is based on short pulse-response experiments at low background pressure (10-10 Pa), 
which are used to probe different steps in a catalytic process on the surface of a 
porous material including diffusion, adsorption, 
surface reactions, and desorption.