Preliminary evaluation of the performance of an adsorption‐based hydrogen storage system

Abstract

in Wiley InterScience (www.interscience.wiley.com).Using modeling and thermal simulations, the feasibility of an adsorption-based hydrogen storage system for vehicles is evaluated. The storage capacity of a 150 L tank filled with a high surface-area activated carbon is mapped for temperatures from 60 to 298 K and pressures up to 35 MPa. The thermal simulations are verified using experiments. For a storage capacity target of 5 kg, the adsorption-based storage system will offer a storage advantage over the cryogenic gas storage if the residual mass of hydrogen in the tank is retrieved by heating. For a discharge rate of 1.8 g/s, the required heat is of the order of 500 W. The net energy requirements for the refueling has contributions from compression, precooling and tank cooling and can approach that for liquid hydrogen storage. With a good insulation and a maximum tank pressure of 35 MPa, the dormancy period can be extended to several weeks. V

Enhanced Hydrogen Dipole Physisorption, Final Report

“…The superactivated carbon MSC-30, a material processed similarly to Anderson AX-21, is reported to have a BET surface area ranging from 2600-3400 m 2 g -1 . 136,137,138,139,140 This variation is not only due to differences in the analysis of the N2 adsorption isotherms at 77 K, but is also reflected in differences in hydrogen adsorption isotherms at temperatures from 77-298 K, implying that different batches of MSC-30 have different properties. Hydrogen capacities of MSC-30 at 298 K range from 3-4 mmol g -1 (0.6-0.8 wt%) at 10 MPa; in this report, it was measured to be 3.9 mmol g -1 which is consistent with the upper end of this range.…”

“…Carbonaceous materials often have a similar skeletal density to graphite, 2.1-2.2 g mL -1 . 138 However, skeletal densities in ZTCs are significantly lower, 1.8 g mL -1 . This indicates a less graphitic nature of ZTCs, but is not easily explained since ZTCs are predominantly sp 2 carbon.…”

Effect of flowthrough cooling heat removal on the performances of MOF-5 cryo-adsorptive hydrogen reservoir for bulk storage applications

“…Absolute adsorption of hydrogen on MOF-5, n a is calculated using the modified D-A adsorption model [27,30]. In the modified D-A model, absolute adsorption is related to the state variables, temperature T and pressure P using Eq.…”

Stability of MOF-5 in a hydrogen gas environment containing fueling station impurities

“…The sample cell was immersed in a liquid nitrogen bath, with the LN 2 level filled to a specific height. Excess adsorption amounts were calculated by the standard method [33]. Further details on the isotherm measurement methods can be found in Ref [29].…”