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Chemoadsorption for separation of Hydrogen Sulfide from biogas with iron hydroxide and sulfur recovery

Chemoadsorption for separation of H2S from biogas with iron hydroxide and sulfur recovery
: Lincke, Marc; Petasch, Uwe; Gaitzsch, Uwe; Tillmann, Andreas; Tietze, Michael; Niebling, Falko


Chemical Engineering and Technology 43 (2020), No.8, pp.1564-1570
ISSN: 0930-7516
ISSN: 1521-4125
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
Optimisation of the energetic use of biomass; 03KB151; SuRIOx-pt
Optimierung Adsorbermaterial und praxisnahe Erprobung eines mehrstufigen Verfahrens zur Entschwefelung von Biogas aus der Reststoffvergärung
Journal Article
Fraunhofer IKTS ()
Fraunhofer IFAM ()
biogas desulfurization; sulfur removal; iron hydroxide; hydrogen sulfide; coated metallic foam

H2S removal from biogas is essential to allow biogas storage in the natural gas grid. Several established methods exist, most of them make use of non‐reusable substrates, such as iron sponge or active carbon. Coated metallic foams provide a reusable sustainable alternative. Several iron oxides and hydroxides were tested in order to validate the H2S adsorption properties before and after thermal regeneration, i. e. sulfur removal. Amorphous iron hydroxide proved to efficiently clean biogas after max. 4 sulfur removal cycles. It showed an almost 10 times larger capacity for sulfur adsorption than crystalline hematite Fe2O3. Very low H2S contents could be realized until breakthrough.