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Environ Technol

Title:		Comparison of adsorbents for H2S and D4 removal for biogas conversion in a solid oxide fuel cell
Author(s):		Sigot L; Ducom G; Benadda B; Laboure C;
Address:		"a LGCIE-DEEP , Universite de Lyon, INSA-Lyon , EA4126, 20 Avenue Albert Einstein, F-69621 Villeurbanne cedex , France. b CIRSEE , Suez-Environnement , 38 rue du President Wilson, F-78230 Le Pecq , France"
Journal Title:		Environ Technol
Year:		2016
Volume:		20150720
Issue:		1
Page Number:		86 - 95
DOI:		10.1080/09593330.2015.1063707
ISSN/ISBN:		1479-487X (Electronic) 0959-3330 (Linking)
Abstract:		"Biogas contains trace compounds detrimental for solid oxide fuel cell (SOFC) application, especially sulphur-containing compounds and volatile organic silicon compounds (VOSiCs). It is therefore necessary to remove these impurities from the biogas for fuelling an SOFC. In this paper, dynamic lab-scale adsorption tests were performed on synthetic polluted gas to evaluate the performance of a polishing treatment to remove hydrogen sulphide (H2S - sulphur compound) and octamethylcyclotetrasiloxane (D4 - VOSiC). Three kinds of adsorbents were tested: an activated carbon, a silica gel (SG) and a zeolite (Z). Z proved to be the best adsorbent for H2S removal, with an adsorbed quantity higher than [Formula: see text] at the SOFC tolerance limit. However, as concerns D4 removal, SG was the most efficient adsorbent, with an adsorbed quantity of about 184 mgD4/gSG at the SOFC tolerance limit. These results could not be explained by structural characteristics of the adsorbents, but they were partly explained by chemical interactions between the adsorbate and the adsorbent. In these experiments, internal diffusion was the controlling step, Knudsen diffusion being predominant to molecular diffusion. As Z was also a good adsorbent for D4 removal, competition phenomena were investigated with Z for the simultaneous removal of H2S and D4. It was shown that H2S retention was dramatically decreased in the presence of D4, probably due to D4 polymerization resulting in pore blocking"
Keywords:		Adsorption Biofuels/*analysis Charcoal/*chemistry Hydrogen Sulfide/*chemistry Silica Gel/*chemistry Siloxanes/*chemistry Waste Management/*methods Zeolites/*chemistry Sofc biogas purification hydrogen sulphide siloxanes;
Notes:		"MedlineSigot, Lea Ducom, Gaelle Benadda, Belkacem Laboure, Claire eng Comparative Study Research Support, Non-U.S. Gov't England 2015/07/18 Environ Technol. 2016; 37(1):86-95. doi: 10.1080/09593330.2015.1063707. Epub 2015 Jul 20"