Accurate hydrogen sorption measurements via differential pressure analyses

Session: Experimental Methods in Adsorption II. Oral Presentation (261c)A differential pressure adsorption unit (DPAU) has been constructed which is capable of accurately measuring isotherm data up to 2400 psia with as little as 50 mg of sample. This non-traditional adsorption/desorption method has been benchmarked by comparing hydrogen and methane isotherms measured with standard volumetric and gravimetric instruments on a NaA (4A) zeolite and an activated carbon at near ambient temperatures. The results from stability tests and a discussion of the mathematical analysis will be provided as well as a discussion of the unit's recent application in measuring credible hydrogen sorption isotherms on a series of well-defined single walled carbon nanotubes.Zielinski, J. M., Coe, C. G., Cooper, A. C., Pez, G. P