(396b) High-Throughput Isotherm Measurements On Functionalized Cr-MIL-101 Structures for Biogas Purification

During
the last decade the study of adsorption properties in a technical relevant
pressure and temperature range came more and more in the focus of interest. The fast increase in the number of new porous materials, e.g. Hybrid
materials as MOF's or MIL's as well as activated carbons or zeolites leads to a
large variety of potentially candidates for technical adsorption applications.

For these
applications a fast screening of these materials not only regarding to specific
surface area and porosity but also at elevated pressures and temperatures with various
technically relevant gases is necessary. Although the gravimetric method has
some advantages to the volumetric method it is much easier to parallelize a
volumetric measurement.

Many
different adsorbent materials (AC, zeolites, MOF, IL) were screened with a new
multi-sample volumetric instrument for their potential in adsorptive bio-gas
cleaning and purification. The new instrument allows measuring the adsorption
isotherms of up to six sample materials in one experiment. We have analyzed the
adsorption of the typical biogas components (CH₄, CO₂, N₂,
H₂, H₂S) in the pressure range
up to 25 bar.

In this
presentation we will focus on the results for a series of materials from the
Cr-MIL-101 family⁽¹⁾. Adsorption
isotherms of the various technically relevant gases on the functionalized
Cr-MIL-101-R (R = -OH, NH₂, NO₂, SO₃H, Br)
will be presented. We will compare the results for the functionalized MOF
materials with the results of commercially available MOF and classical
adsorbents. Finally the results will be discussed in respect to the influence
of the functionalization on the adsorption properties.

(1)  
G. Férey,
C. Mellot-Draznieks, C. Serre,
F. Millange, J. Dutour, S. Surblé, I. Margiolako, Science 2005, 309, 2040.