Fabrication of high pressure hydrogen adsorption/desorption unit—Adsorption study on flame synthesized carbon nanofibers

An in-house custom made high pressure adsorption/desorption unit has been designed and fabricated to study reversible hydrogen (H2) intake capacity, hysteresis, kinetics, plateau pressure of various nanomaterials, zeolites and metallic compounds, in the pressure range of 1 ≤ P ≤ 150 atm. The unit has been used to estimate H2 intake capacity of carbon nanofibers prepared by flame synthesis in the absence of catalyst. H2 adsorption studies have been carried out in the pressure range of 25–100 atm at 297 K. The maximum H2 intake capacity has been observed to be 3.7 wt% at 100 atm.