MC² has acquired a new gas sorption instrument: Autosorb-iQ-C by Quantachrome (a branch of Anton Paar). This instrument has very wide applicability in determining the surface area, pore size distribution and surface activity of solids using various sorption principles.

The Autosorb-iQ can not only probe the weak interactions gas molecules form with the surface of a solid by physisorption, but also the strong bonds they form on the solid’s active sites by chemisorption:
In physisorption mode, an adsorption isotherm is measured: it represents the number of molecules that are adsorbed on a solid with respect to the system's pressure. The type and range of porosity can be directly read from the shape of the adsorption isotherm.
Chemisorption is mainly used to quantify the amount of surface-active sites, which are available to catalyse chemical reactions. With temperature programmed methods in reduction, oxidation or desorption modes, the reduction readiness, etc. can be determined and activation energies can be calculated.

Our new instrument is connected to various gases: nitrogen, helium, carbon dioxide and hydrogen, enabling researchers to explore a large range of gas-solid interactions. It complements the other gas sorption instrument in MC², the 3Flex by Micromeritics which only has physisorption capabilities.

Applications include:

  • the determination of pore size distributions of metal organic frameworks (MOFs), activated carbons and zeolites;
  • the determination of dispersion in heterogeneous catalysts, i.e. the ratio between the accessible surface metal sites and the total amount of metal atoms in the bulk;
  • the determination of carbon dioxide storage capability in microporous carbons.