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Article

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

Dubinin Laboratory of Sorption Processes, Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect 31, Building 4, 119071 Moscow, Russia
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Nanomaterials 2020, 10(7), 1379; https://doi.org/10.3390/nano10071379
Received: 22 June 2020 / Revised: 8 July 2020 / Accepted: 13 July 2020 / Published: 15 July 2020
(This article belongs to the Special Issue Nanoscale Thermodynamics)
Two activated carbons (ACs) were prepared from peat using thermochemical K2SO4 activation at 1053–1133 K for 1 h, and steam activation at 1173 K 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 cm3/g), specific BET surface (1334 m2/g), and a lower fraction of mesopores calculated from the benzene vapor adsorption/desorption isotherms at 293 K. 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 360 K 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. View Full-Text
Keywords: activated carbon; high-pressure methane adsorption; thermodynamics of adsorption systems activated carbon; high-pressure methane adsorption; thermodynamics of adsorption systems
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MDPI and ACS Style

Men’shchikov, I.; Shkolin, A.; Khozina, E.; Fomkin, A. Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons. Nanomaterials 2020, 10, 1379. https://doi.org/10.3390/nano10071379

AMA Style

Men’shchikov I, Shkolin A, Khozina E, Fomkin A. Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons. Nanomaterials. 2020; 10(7):1379. https://doi.org/10.3390/nano10071379

Chicago/Turabian Style

Men’shchikov, Ilya, Andrey Shkolin, Elena Khozina, and Anatoly Fomkin. 2020. "Thermodynamics of Adsorbed Methane Storage Systems Based on Peat-Derived Activated Carbons" Nanomaterials 10, no. 7: 1379. https://doi.org/10.3390/nano10071379

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