Isochoric Differential Apparatus

Application domain(s)

  • Advanced Materials
  • GreenTech

Area(s) of expertise

  • Renewable Energies


IDA, Isochoric Differential Apparatus is a volumetric instrument for the characterization of solid material versus gas sorption (e.g. hydrogen, methane, CO2). Two pressure chambers take into direct comparison the sorption phenomena with a reference test.
The istrument gives advantages in terms of higher accuracy on gas uptake/release, reducing errors caused by gas expansion.










Internal view of the instrument, with evidence of the two lines connected to the reference and to the measure chambers.

Advantages & Applications

    IDA is the best performing volumetric instrument to study gas soprtion phenomena in solid materials, in general for hydrogen. Its high accuracy allows to characterize small scale sample, typical in lab scale.
  • MEASURES: thermodynamic and kinetic properties of materials in physisorption and chemisorption, BET.


  • High accuracy: less than 10-5 moles;
  • Fast sorption during start up;
  • Extended measure ranges: from vacuum to  100 Bar, RT to 650 K;
  • Possibility to perform surface study, as BET, at cryogenic temperatures;
  • Possibility to perform adsorption and physisorption tests.


  • TRL 6 – technology demonstrated in relevant environment (industrially relevant environment in the case of key enabling technologies)
  • Patent pending


  • Reference person: Luigi Crema
    Tel. 0461 314922
    e-mail: [email protected]

    Research Unit ARES:
    Research Center CMM: