High-temperature separation of H2S from producer gas produced of biomass gasification by artificially prepared sorbents
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Commercial technologies are available to clean gasification hydrocarbon gases to the stringent levels of contaminants. However, new cheaper technologies are needed for stringent gas cleaning duty for producer gas production from biomass at high temperatures for use in fuel cells. This article describes the thermodynamics calculations aimed to estimate the suitability of various prepared sorbents on the basis of metal oxides (CaO, MnO, FeO, Fe2O3, ZnO and ZnFe2O4) to clean hydrogen sulphide from the producer gas at elevated gas temperatures and experimental verification of the function of prepared sorbents during specific conditions such as temperature and raw gas composition. Our prepared sorbents on the basis of zinc and copper oxides prove high sorption capacities for selective sorption of H2S. These sorbents can be with big advantage used in the industry for removal of H2S from biogas at high temperature. Output gas contains only low concentrations of H2S and can be then used for high-temperature fuel cells to produce electricity.
KeywordsHigh-temperature separation Hydrogen sulphide Producer gas Biomass gasification Fuel cell
This work was co-funded by University of Chemistry and Technology in Prague, and parts of this work have been obtained in the framework of European research program called Green fuel cell project co-financed by the European Commission under the Contract No. SES6-CT-2004-503122.
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