Temperature Programmed Desorption
National Renewable Energy Laboratory (NREL)
Tom Gennett ([email protected])
Temperature programmed desorption is a dynamic measurement that monitors the evolution of a gas(es) upon heating. Gas evolution can be monitored by a pressure sensor, mass flow meter, and/or by the use of a mass spectrometer (MS) to determine the chemical composition of the evolved gas. TPD can be used to study reaction kinetics and mechanisms, detect reactions, material impurities, and composition. TPD can also be utilized to evaluate sorption process, including measuring the activation energy of sorption. Within HyMARC, we have the capability to dose samples up to 2 bar with Hydrogen gas, quench with LN2 and utilize a controlled ramp from 1-50 ˚C/min to evaluate the desorption processes and capacity under low pressure conditions.