Identifying high performing catalytic materials by measuring intrinsic kinetic properties
The Temporal Analysis of Products (TAP) reactor system is a transient pulse response
technique for collecting detailed reaction kinetic information on industrial catalysts.
By removing the material from the complexity of the operating environment, the rate-controlling
intrinsic kinetic function of the material can be more clearly assessed. This approach
allows for direct comparison of catalytic materials on a kinetic basis. In a TAP pulse
response experiment, an ultralow intensity pulse is injected into the micro-reactor
under vacuum conditions. Since transport in the reactor is well-defined Knudsen diffusion,
time delays of exiting molecules are attributed to a kinetic process and established
theoretical techniques are used to extract quantitative kinetic data. Varying probe
molecules can be utilized to distinguish certain bond breaking/formation reactions
and long pulse experiments can be utilized to incrementally track changes in material
composition (oxidation/reduction/deactivation) and the resulting impact on kinetics.