Abstract
Biogas produced from biomass is carbon neutral. In fact, the carbon feedstock of biomass is converted into gas phase. Biogas use in high efficient energy systems, such as Solid Oxide Fuel Cells is a viable choice. One of the most important drawbacks for such systems is related to the interaction between trace compounds and anode section. Gas cleaning through physical removal mechanisms is the simplest and cheapest method adopted in the literature. Coupled with this solution, the recovery of waste materials is an efficient application of the circular economy approach. In this work, a physical activation process was investigated experimentally for waste-derived materials at a temperature of 700 °C. The removal of H2S was considered as the most abundant trace compound. Activated biochar showed an adsorption capacity comparable to commercial sorbents, while the performance of ashes are still too poor. An important parameter to be considered is the biogas humidity content that enters in competition with trace compounds that must be removed.
Highlights
Scientists believed that the Earth’s climate change could be related to the high concentration of CO2 and other greenhouse gases produced by human activities
Results related to the adsorption capacity were reported below, starting from the characterization to the sorbent selection considering the waste-derived materials
Hydrogen sulphide removal performance of waste-derived material, such as biochar show lower adsorption capacity compared to optimized commercial sorbents
Summary
Scientists believed that the Earth’s climate change could be related to the high concentration of CO2 and other greenhouse gases produced by human activities. Biogas is a secondary energy carrier and can be produced from many organic substrates, such as from agricultural sources, sewage sludge and animal waste [1,2,3,4,5,6]. Biogas can be adopted as a fuel for several energy generators, such as fuel cells, as well as external and internal combustion engines [8,9]. High temperature solid oxide fuel cells have higher electrical efficiency values, high fuel feeding flexibility, low noise and pollutant emissions [8,12,13,14]. Depending on the nature of the trace compound and its concentration in the gaseous matrix, a gas cleaning section has to be designed. The most frequently detected trace compounds from Organic Fraction of Municipal Solid
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