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

Nanomaterials
Ilya E Men'shchikovAnatoly A Fomkin

Abstract

Two activated carbons (ACs) were prepared from peat using thermochemical K2SO4 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 cm3/g), specific BET surface (1334 m2/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 ev...Continue Reading

References

Nov 18, 2009·Journal of the American Chemical Society·Karena W ChapmanPeter J Chupas
May 14, 2011·Science·Yanwu ZhuRodney S Ruoff
Jul 7, 2011·Advanced Materials·Daqiang YuanHong-Cai Zhou
Sep 20, 2012·Chemical Society Reviews·Trevor A MakalHong-Cai Zhou
Jan 18, 2017·Chemical Reviews·K Vasanth KumarFrancisco Rodríguez-Reinoso
May 19, 2017·Journal of Chemical Theory and Computation·Ariana Torres-KnoopDavid Dubbeldam
May 23, 2017·Chemical Society Reviews·Marta Rubio-MartinezMatthew R Hill

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Citations

Mar 4, 2021·Nanomaterials·Signe Kjelstrup

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Methods Mentioned

BETA
X-ray
scanning electron microscopy
scanning

Software Mentioned

IPCE

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