Harloff, Jörg

Jentzsch, Bert

Kosslick, Hendrik

Matzmohr, Roland

Schulz, Axel

Sprenger, Bertold

Wolff, Hans-Joachim

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 Selective Adsorption of H2S on MOFs and Zeolite NaX Bert Jentzsch, Hendrik Kosslick, Henrik Lund, Jörg Harloff, Axel Schulz, Roland Matzmohr, Bertold Sprenger, Hans-Joachim Wolff Universität Rostock, Mathematisch-naturwissenschaftliche Fakultät und Fakultät für Maschinenbau und Schiffstechnik, Albert-Einstein-Straße 2,  18059 Rostock, Germany, E-Mail: hans-joachim.wolff@uni-rostock.de 1. Introduction Biogas up-grading requires the removal of S- and N-containing contaminants before  further working up. We report here results on the ability of MOFs [1,2] to remove H2S, the main S-contaminant, from natural wet biogas streams. 2. Experimental The IRMOFs were synthesized solvothermally under autogeneous pressure according to the literature. Zeolite NaX was commercial. Materials were characterized by XRD and TEM. Adsorption tests were carried out in a column adsorber with streaming biogas. 3. Results The results show that IRMOFs are able to remove nearly completely H2S from biogas streams also in the presence of moisture. The adsorption capacity was superior to commercial zeolite NaX. TEM images reveal the high porosity of the IRMOF framework. As a result, only a very low pressure drop is observed in the sorption experiment.  First attempts are undertaken to predict mass transfer properties from experimental sorption curves  4. Conclusion First results in the study of MOFs as adsorbents for working up of raw biogas obtained from biogas reactors confirm the potential of this new class of materials for gas separation and cleaning. Obviously, this holds also for low concentrations of H2S. The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and Application © 2009, H.-J. Wolff diffusion-fundamentals.org 11 (2009) 32, pp 1-2 H2S adsorption on Zeolite NaX0204060801001200 500 1000 1500 2000time  t [s]H 2S [ppm]  H2S adsorption on IRMOF-30204060800 2000 4000 6000time  t [s]H2S  [ppm] Fig.1: H2S adsorption from natural Biogas on 1g f Zeolite X (top) and IRMOF-3 (bottom) at r.t. H2S content: 300 ppm, gas stream through adsorber : 1L/min.  References [1)    O. M. Yaghi, Acc Che. Res. 38 (2004) 176. [2] R. Millward and O. M. Yaghi  J. Am. Chem. Soc. 127 (2005) 17998. 

Selective adsorption of H 2 S on MOFs and Zeolite NaX

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Selective adsorption of H 2 S on MOFs and Zeolite NaX

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