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High Pressure Gas Adsorption for Gas Storage Material

iSorb-HP Series

High pressure adsorption measurements are important in the fields of carbon dioxiHigh pressure gas sorption analyzer, the iSorb HPde sequestration, methane storage, hydrogen storage, and gas separation. The iSorb-HP instruments (volumetric sorption or Sieverts apparatus) generate automatic measurements of full adsorption and desorption isotherms over a wide range of pressures and temperatures. These isotherms can be displayed in the traditional surface excess vs. pressure plot or as a PCT (Pressure-Composition-Temperature) plot. See more .

The iSorb series is a family of four such high pressure sorption instruments; one and two-sample models each available with an upper pressure limit of 100bar or 200bar, complete with built in vacuum pumps and sample degassing capability. All models feature pressure transducers both in the dosing manifold and on the sample cell for maximum sensitivity; this also provides the iSorb-HP2 model the capability to simultaneously analyze two samples.

High pressuregas sorption measurements are defined in terms of pressure or dose amount for both adsorption and desorption, equilibrium criteria, sample temperature (according to the heating /cooling device selected) and choice of equation of state (EoS)*:

  • Schmidt-Wenzel type, defined in terms of Helmholtz free energy (NIST recommended)
  • MBWR (Modified Benedict-Webb-Rubin type, Jacobsen 32-coefficients, NIST recommended).
  • Lee-Kesler (generalized Benedict-Webb-Rubin).
  • Peng-Robinson
  • Soave-Redlich-Kwong
  • Redlich-Kwong
  • Van der Waals
  • Ideal gas

Analysis temperatures are achieved either by recirculator bath (-20oC to 100oC, see below), cryocooler (77K-320K), or heating mantle (up to 400oC).


Analysis stations 1 2
Gas input 2 (optional 4) 2 (optional 4)
Max pressure data 200 bar (a) 200 bar (a)
Min pressure data 0.0005 bar 0.0005 bar
LP transducers 2 (1 bar) 3 (1 bar)
HP transducers 2 3
Total transducer count 4 6
Tranducer accuracy <±0.05% f.s. <±0.05% f.s.
Vacuum pump internal internal
Turbo pump option yes yes
Degas type automatic automatic
Degas ports in-situ in-situ
Heating mantle(standard) yes yes
Max degas temp ( oC ) 400 (b) 400 (b)
Thermostatted bath (option) yes yes
Booster option yes yes
Thermostatted manifold yes yes
Gas inputs at side for easy access for easy access

 (a) or 100 bar for lower pressure model.
( b) or 100 bar for lower pressure model.

PHYSICAL iSorb HP1 iSorb HP2
Height (cm) 110 110
Width (cm) 100 100
Depth (cm) 60 60
Weight (kg) 140 148


iSorb HP | iSorb HP Brochure


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