263594 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.
Graph 1: Supertetrahedron in the Cr-MIL-101
Graph 2: High pressure adsorption of various gases
(1) G. Férey, C. Mellot-Draznieks, C. Serre, F. Millange, J. Dutour, S. Surblé, I. Margiolako, Science 2005, 309, 2040.