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XEMIS – Gravimetric Sorption Analysis in Extreme Environments

XEMIS instrument from Hiden Isochema

The XEMIS sorption microbalance is designed to allow gravimetric gas and vapour sorption measurements under harsh conditions, with high pressure or corrosive species.

XEMIS uses a proprietary balance mechanism which gives excellent performance comparable to our well known IGA gas and vapour sorption microbalances.

A modular design concept allows a wide range of different configurations, to address the full range of sorption applications.

Application Areas :

  • Gas storage : H2, CH4, CO2
  • Corrosive gases : SO2, NH3, CO, …
  • Gas sorption for separation
  • Chemisorption studies
  • Geological gas storage and coal bed methane studies
  • Gas solubility in ionic liquids
  • Sorption kinetic analysis

Key Specifications :

Balance :
    Capacity : 5 g
    Resolution : 0.2 µg
    Stability : ±1 μg short term
±5 μg long term
Pressure : High vacuum to 200 bars (20 MPa, 2.9 kpsi)
A range of sensors is available to cover the pressures of interest, from low vapour pressures up to the instrument maximum.
Temperature : 77 K to 773 K (−196 °C to 500 °C)
Continuous measurements : data collection up to 10 times per second

Example Data :

Isothermal sorption kinetics measured after a step change in pressure :

Hydrogen absorption kinetics on Pd at 303 K at 40 mbar shown by the blue trace.  In comparison, an empty pan trace under identical conditions shown in orange demonstrating the excellent base line stability of the XEMIS.
Hydrogen absorption kinetics on Pd at 303 K at 40 mbar shown by the blue trace. In comparison, an empty pan trace under identical conditions shown in orange demonstrating the excellent base line stability of the XEMIS.

Sorption Studies with Corrosive Gases and Vapours :

Adsorption-desorption isotherms for sulphur dioxide on a metal-organic framework (NOTT-300) measured at a range of temperatures with XEMIS.
Adsorption-desorption isotherms for sulphur dioxide on a metal-organic framework (NOTT-300) measured at a range of temperatures with XEMIS.

High Pressure Gas Sorption :

Methane adsorption isotherms measured on a geological sample at pressures up to 100 bar and a range of temperatures using the XEMIS gravimetric sorption instrument.
Methane adsorption isotherms measured on a geological sample at pressures up to 100 bar and a range of temperatures using the XEMIS gravimetric sorption instrument.

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.
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