Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Adsorption of Hydrogen Sulphide on Activated Carbon Materials Derived from the Solid Fibrous Digestate

Evangelia Choleva
,
Anastasios Mitsopoulos
,
Georgia Dimitropoulou
ORCID logo ,
George Em. Romanos
ORCID logo ,
Evangelos P. Kouvelos
* ,
Georgios Pilatos
,
Stylianos D. Stefanidis
,
Angelos Lappas
,
Themistoklis Sfetsas
* ORCID logo
Version 1 : Received: 7 June 2023 / Approved: 8 June 2023 / Online: 8 June 2023 (04:31:16 CEST)

A peer-reviewed article of this Preprint also exists.

Choleva, E.; Mitsopoulos, A.; Dimitropoulou, G.; Romanos, G.E.; Kouvelos, E.; Pilatos, G.; Beltsios, K.; Stefanidis, S.; Lappas, A.; Sfetsas, T. Adsorption of Hydrogen Sulfide on Activated Carbon Materials Derived from the Solid Fibrous Digestate. Materials 2023, 16, 5119. Choleva, E.; Mitsopoulos, A.; Dimitropoulou, G.; Romanos, G.E.; Kouvelos, E.; Pilatos, G.; Beltsios, K.; Stefanidis, S.; Lappas, A.; Sfetsas, T. Adsorption of Hydrogen Sulfide on Activated Carbon Materials Derived from the Solid Fibrous Digestate. Materials 2023, 16, 5119.

Abstract

The goal of this work is to develop a sustainable value chain of carbonaceous adsorbents that can be produced from the solid fibrous digestate (SFD) of biogas plants and further applied in integrated desulphurisation-upgrading (CO2/CH4 separation) processes of biogas to yield high purity biomethane. On this purpose, physical and chemical activation of the SFD derived biochar was optimised to afford micro-mesoporous activated carbons (ACs) of high BET surface area (590-2300 m2g−1) and enhanced pore volume (0.57-1.0 cm3g−1). Gas breakthrough experiments from fixed bed columns of the obtained ACs, using real biogas mixture as feedstock, unveiled that the physical and chemical activation conclude to different types of ACs which are sufficient for biogas upgrade and biogas desulphurisation respectively. Performing breakthrough experiments at three temperatures close to ambient it was possible to define the optimum conditions for enhanced H2S/CO2 separation. It was also concluded that the H2S adsorption capacity is significantly affected by restriction to gas diffusion. Hence, the best performance was obtained at 50 oC and the maximum observed in the H2S adsorption capacity vs the temperature is attributed to the counterbalance between adsorption and diffusion processes.

Keywords

activated carbon; hydrogen sulfide; biogas; physical adsorption; micropores; biogas; solid fibrous digestate; carbon dioxide; mesopores

Subject

Environmental and Earth Sciences, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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