Combination volumetric and gravimetric sorption instrument for high accuracy measurements of methane adsorption

Abstract

The accurate measurement of adsorbed gas up to high pressures (∼100 bars) is critical for the development of new materials for adsorbed gas storage. The typical Sievert-type volumetric method introduces accumulating errors that can become large at maximum pressures. Alternatively, gravimetric methods employing microbalances require careful buoyancy corrections. In this paper, we present a combination gravimetric and volumetric system for methane sorption measurements on samples between ∼0.5 and 1 g. The gravimetric method described requires no buoyancy corrections. The tandem use of the gravimetric method allows for a check on the highest uncertainty volumetric measurements. The sources and proper calculation of uncertainties are discussed. Results from methane measurements on activated carbon MSC-30 and metal-organic framework HKUST-1 are compared across methods and within the literature.

Gravimetric tank method to evaluate material-enhanced hydrogen storage by physisorbing materials

“…41 Very few attempts to use this method were presented over past years and only as a feasibility test for storage of methane using activated carbons. 42 The paper by Zielinski et al 41 remains the only one where hydrogen storage evaluation was tested using weighing the whole test ''capsule'' with material and hydrogen inside. We believe that the reasons for the lack of attention to the GT method are the following:…”