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Choleva E, Mitsopoulos A, Dimitropoulou G, Romanos GE, 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 (BASEL, SWITZERLAND) 2023; 16:5119. [PMID: 37512393 PMCID: PMC10386193 DOI: 10.3390/ma16145119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/06/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023]
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 desulfurization-upgrading (CO2/CH4 separation) processes of biogas to yield high-purity biomethane. For this purpose, physical and chemical activation of the SFD-derived BC was optimized 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 led to different types of ACs, which were sufficient for biogas upgrade and biogas desulfurization, 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 was significantly affected by the restriction to gas diffusion. Hence, the best performance was obtained at 50 °C, and the maximum observed in the H2S adsorption capacity vs. the temperature was attributed to the counterbalance between adsorption and diffusion processes.
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Affiliation(s)
- Evangelia Choleva
- QLAB Private Company, Research & Development, Quality Control and Testing Services, 57008 Thessaloniki, Greece
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", 15310 Athens, Greece
- Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Anastasios Mitsopoulos
- QLAB Private Company, Research & Development, Quality Control and Testing Services, 57008 Thessaloniki, Greece
- Biogas Lagada SA, 677 Parcel, Kolchiko, 57200 Lagadas, Greece
| | - Georgia Dimitropoulou
- QLAB Private Company, Research & Development, Quality Control and Testing Services, 57008 Thessaloniki, Greece
| | - George Em Romanos
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", 15310 Athens, Greece
| | - Evangelos Kouvelos
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", 15310 Athens, Greece
| | - George Pilatos
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", 15310 Athens, Greece
| | - Konstantinos Beltsios
- Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece
- School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 9, Iroon Polytechniou Str., Zografou, 15780 Athens, Greece
| | - Stylianos Stefanidis
- Laboratory of Environmental Fuels/Biofuels and Hydrocarbons, Chemical Process and Energy Resources Institute, CERTH, 57001 Thessaloniki, Greece
| | - Angelos Lappas
- Laboratory of Environmental Fuels/Biofuels and Hydrocarbons, Chemical Process and Energy Resources Institute, CERTH, 57001 Thessaloniki, Greece
| | - Themistoklis Sfetsas
- QLAB Private Company, Research & Development, Quality Control and Testing Services, 57008 Thessaloniki, Greece
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Sokolov SE, Volkov VV. High Pressures Gas Adsorption in Porous Media and Polymeric Membrane Materials. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622070022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Dumi A, Upadhyay S, Bernasconi L, Shin H, Benali A, Jordan KD. The binding of atomic hydrogen on graphene from density functional theory and diffusion Monte Carlo calculations. J Chem Phys 2022; 156:144702. [DOI: 10.1063/5.0085982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, density functional theory (DFT) and diffusion Monte Carlo (DMC) methods are used to calculate the binding energy of a H atom chemisorbed on the graphene surface. The DMC value of the binding energy is about 16% smaller in magnitude than the Perdew–Burke–Ernzerhof (PBE) result. The inclusion of exact exchange through the use of the Heyd–Scuseria–Ernzerhof functional brings the DFT value of the binding energy closer in line with the DMC result. It is also found that there are significant differences in the charge distributions determined using PBE and DMC approaches.
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Affiliation(s)
- Amanda Dumi
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - Shiv Upadhyay
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - Leonardo Bernasconi
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
- Center for Research Computing, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - Hyeondeok Shin
- Computational Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Anouar Benali
- Computational Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Kenneth D. Jordan
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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Editorial for Special Issue “Hydrogen Production and Storage”. REACTIONS 2022. [DOI: 10.3390/reactions3010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Hydrogen appears as an unavoidable energy vector and an almost miracle solution to global warming for many people [...]
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