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Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons

Men'shchikov, Ilya ; Shkolin, Andrey ; Khozina, Elena ; Fomkin, Anatoly

Nanomaterials (Basel, Switzerland), 2020-07, Vol.10 (7), p.1379 [Periódico revisado por pares]

Switzerland: MDPI AG

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Título:
Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons
Autor: Men'shchikov, Ilya ; Shkolin, Andrey ; Khozina, Elena ; Fomkin, Anatoly
Assuntos: Activated carbon ; Adsorbents ; Adsorption ; Benzene ; Carbon ; Chemical composition ; Equilibrium ; Gases ; Heat ; Heterogeneity ; High temperature effects ; high-pressure methane adsorption ; Methane ; Morphology ; Natural gas ; Peat ; Porous materials ; Potassium ; Potassium sulfate ; Scanning electron microscopy ; Small angle X ray scattering ; Steam ; Storage systems ; Thermodynamics ; thermodynamics of adsorption systems ; X-ray diffraction ; X-ray scattering
É parte de: Nanomaterials (Basel, Switzerland), 2020-07, Vol.10 (7), p.1379
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Two activated carbons (ACs) were prepared from peat using thermochemical K SO activation at 1053-1133 K for 1h, and steam activation at 1173K for 30 (AC-4) and 45 (AC-6) min. The steam activation duration affected the microporous structure and chemical composition of ACs, which are crucial for their adsorption performance in the methane storage technique. AC-6 displays a higher micropore volume (0.60 cm /g), specific BET surface (1334 m /g), and a lower fraction of mesopores calculated from the benzene vapor adsorption/desorption isotherms at 293K. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS) investigations of ACs revealed their heterogeneous morphology and chemical composition determined by the precursor and activation conditions. A thermodynamic analysis of methane adsorption at pressures up to 25 MPa and temperatures from 178 to 360K extended to impacts of the nonideality of a gaseous phase and non-inertness of an adsorbent made it possible to evaluate the heat effects and thermodynamic state functions in the methane-AC adsorption systems. At 270 K and methane adsorption value of ~8 mmol/g, the isosteric heat capacity of the methane-AC-4 system exceeded by ~45% that evaluated for the methane-AC-6 system. The higher micropore volume and structural heterogeneity of the more activated AC-6 compared to AC-4 determine its superior methane adsorption performance.
Editor: Switzerland: MDPI AG
Idioma: Inglês

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Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons

Men'shchikov, Ilya ; Shkolin, Andrey ; Khozina, Elena ; Fomkin, Anatoly

Switzerland: MDPI AG

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