advancing sorption science

IMI systems for high pressure manometric gas adsorption measurements

IMI instrument with integrated reactor option

IMI is a flexible platform for gas sorption analysis. Based on the manometric Sieverts method, the IMI features many possibilities for novel and unique approaches to the measurement of gas adsorption/absorption properties of materials.

As an evolution of our successful HTP systems, the IMI is based on several fundamental principles :

  • Modular, fully upgradable design
  • Careful design of system volumes and thermostatting for maximum sensitivity and accuracy, even with the smallest samples.
  • Highly flexible configuration of experiments
  • Unrivalled safety features
  • Wide range of options for :
    • pressure and temperature control,
    • multiple reference volumes,
    • a variety of reactor configurations,
    • flow-controlled Dynamic experiments,
    • fully integrated mass spectrometry.

Experimental Methods

  • Sieverts method
    • for gas sorption and desorption isotherm determination
    • kinetic data
    • configurable equilibration times and endpoint criteria
  • Automatic PCT mapping
  • Automated sequences and cycling of pressure and temperature for sample pretreatment and activation
  • Dynamic and Flowing Methods with IMI-FLOW options :
    • Dynamic sample treatments,
    • Volumetric kinetic measurement,
    • Thermal desorption analysis, TPD,
    • Thermal desorption-Mass spectrometry, etc.


Specifications depend on the configuration of a particular instrument, but a typical system might offer the following characteristics.

  • Pressure : 0 to 200 bar (0 to 20 MPa)
  • Temperature : 77 K to 773 K ( −196 °C to 500 °C)
  • Sample volumes from 1 to 10cc
  • Sample sizes few mg to 10’s of grams
  • Typical gases : H2, CO2, CH4, N2, Ar etc

Please contact us to discuss your specific requirements.

Pressure, Temperature and Reactor options

  • Gas supply and pressure measurement options
    • Standard 100 bar pressure range.
    • 2 mbar to 200 bar options
    • Multiple dosing volume options (10 cc to 1 litre)
    • Multiple gas inputs
    • High vacuum in-situ degas with integrated turbo pumping
  • Sample Cell/Reactor and temperature control options
    • Reactor with integrated heater and optional cooling (cryogen or waterbath circulation).
    • Removable cell for loading in a glovebox
    • Cryogen immersion sample cell.
    • Tube furnace
    • Standard reactor sizes of 1 cc, 10 cc.
    • Remote and custom reactor options availble for special applications.
  • Dynamic and Mass spectrometry
    • Flow controllers for dynamic measurements
    • Through-path sample reactors.
    • Fully integrated Mass spectrometer (both hardware and software)

Safety features

  • Minimal pressurised volume to limit stored energy, and gas hazard.
  • Permanently connected overpressure protection.
  • Automatic reactor integrity check after sample loading.
  • Leak detector interface and options for automatic system shutdown.
  • Fully compliant with the European Pressure Equipment Directive (PED)

Several basic configurations are proposed, each of which responds to a basic application type. All IMI systems can be enhanced with optional features to respond to your specific needs :

  • IMI-HTP for high pressure manometric analysis
  • IMI-PSI with adaptions for porous materials characterisation
  • IMI-FLOW systems with multistream dynamic flow and integrated mass spectrometry

See also

For further information, or if you would like to discuss your application, please contact us.

Mercer Instruments specialises in the supply and support of scientific instruments for measurements of sorption, and characterisation of pore size and surface area.
Mercer Instruments
for gas and vapour sorption.
In France, Italy, Switzerland, and Benelux.
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