The TAP Reactor system is a transient pulse response technique for collecting detailed kinetic information on complex, industrial catalysts and chemically active surfaces. By removing the material from the complexity of the operating environment the intrinsic kinetic function of the material in controlling chemical reactions can be more clearly assessed. In a TAP pulse response experiment, an ultralow intensity pulse (10 nmol) is injected into the microreactor under vacuum conditions. Transport in the reactor is well-defined Knudsen diffusion and any additional time delays of exiting molecules are attributed to a kinetic process. Theoretical techniques are well-developed for extracting quantitative kinetic data. Probe molecules can be selected to distinguish certain bond breaking/formation reactions. The level of kinetic rigor is similar to that found in molecular beam scattering experiments; but with TAP, complex materials can be assessed to the same extent directly from an operating environment. Relevant to high temperature water splitting, TAP can be used to support the development of complex catalysts applicable to heterogeneous reactions, or to measure surface adsorption and reaction behavior of SOFCs and STCH materials Assessing how material composition and processing pretreatment influence molecule interactions can shed light on how the structure/composition/kinetics function at a fundamental level. With a long pulse series one can incrementally track changes in composition (oxidation/reduction/deactivation) and then gauge the impact on kinetics.