Methane adsorption on microporous carbon adsorbent with wide pore size distribution

Фомкин, А. А.; Меньщиков, И. Е.; Прибылов, А. А.; Gur’yanov, V. V.; Школин, А. В.; Zaitsev, D. S.; Tvardovskii, A. V.

doi:10.1134/s1061933x16060053

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…However, with the increase in the micropore fillings, the dependences H 1 (T) become nonlinear. The rate of their growth, H 1 '(T), increases with temperature, which is determined by the contribution from temperature-dependent compressibility of the gas phase Z and derivative (∂P/∂a)•V a in Equation (6) for q st (see the fan of curves q st = f (a) in Figure 6a,b).…”

Section: Differential Molar Isosteric Enthalpy Of the Methane-ac Adsorption Systemsmentioning

confidence: 99%

“…In most studies, when choosing an adsorbent for an ANG system, the most crucial criterion is the methane adsorption capacity [2][3][4]. Among adsorbents, activated carbons (AC) [2,[4][5][6][7][8], metal-organic frameworks (MOF) [5,9,10], and porous organic polymers (POP) [10,11] are the most promising for use in ANG technology because of their high adsorption capacity of methane, which is the major component of natural gas. It should be noted that the utilization of these materials for the ANG storage systems implies that they meet the requirements imposed on these systems.…”

Section: Introductionmentioning

confidence: 99%

“…The differential molar isosteric heat of adsorption versus the value of methane adsorption in AC-4 (a) and AC-6 (b) at temperatures, K: 178 (1), 216 (2), 243 (3), 273.15 (4), 300 (5), 320 (6), 340(7), 360(8). Symbols show experimental data; solid curves are the results of approximation by Equation(6). The error bar is 10%.…”

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confidence: 99%

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

et al. 2020

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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 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.

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Section: Differential Molar Isosteric Enthalpy Of the Methane-ac Adsorption Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Therefore, new technological solutions are required to increase the energy density of NG, and an adsorbed NG (ANG) method seems to be the most effective one for accumulation and storage [9][10][11]. Based on a rich set of experimental data reported over the past twenty years [11][12][13][14][15][16][17][18], activated carbons and metal-organic framework structures are recognized as the most promising adsorbents for employing in ANG systems.…”

Section: Introductionmentioning

confidence: 99%

ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

Соловцова

Меньщиков

Школин

et al. 2022

Adsorption Science & Technology

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Metal-organic frameworks (MOF), potentially porous coordination structures, are envisioned for adsorption-based natural gas (ANG) storage, including mobile applications. The factors affecting the performance of the ANG system with a zirconium-based MOF with benzene dicarboxylic acid as a linker (ZrBDC) as an adsorbent were considered: textural properties of the adsorbent and thermal effect arising upon adsorption. The high-density ZrBDC-based pellets were prepared by mechanical compaction of the as-synthesized MOF powder at different pressures from 30 to 240 MPa at 298 K without a binder and mixed with polymer binders: polyvinyl alcohol (PVA) and carboxyl methylcellulose (CMC). The structural investigations revealed that the compaction of ZrBDC with PVA under 30 MPa was optimal to produce the ZrBDC-PVA adsorbent with more than a twofold increase in the packing density and the lowest degradation of the porous structure. The specific total and deliverable volumetric methane storage capacities of the ZrBDC-based adsorbents were evaluated from the experimental data on methane adsorption measured up to 10 MPa and within a temperature range from 253 to 333 K. It was measured experimentally that at 253 K, an 100 mL adsorption tank loaded with the ZrBDC-PVA pellets exhibited the deliverable methane storage capacity of 172 m3(NTP)/m3 when the pressure dropped from 10 to 0.1 MPa. The methane adsorption data for the ZrBDC powder and ZrBDC-PVA pellets were used to calculate the important thermodynamic characteristic of the ZrBDC/CH4 adsorption system—the differential molar isosteric heat of adsorption, which was used to evaluate the state thermodynamic functions: entropy, enthalpy, and heat capacity. The initial heats of methane adsorption in powdered ZrBDC evaluated from the experimental adsorption isosteres were found to be ~19.3 kJ/mol, and then these values in the ZrBDC/CH4 system decreased at different rates during adsorption. In contrast, the heat of methane adsorption onto the ZrBDC-PVA pellets increased from 19.4 kJ/mol to a maximum with a magnitude, width, and position depended on temperature, and then it fell. The behaviors of the thermodynamic state functions of the ZrBDC/CH4 adsorption system were interpreted as a variation in the state of adsorbed molecules determined by a ratio of CH4-CH4 and CH4-ZrBDC interactions. The heat of adsorption was used to calculate the temperature changes of the ANG systems loaded with ZrBDC powder and ZrBDC pellets during methane adsorption under adiabatic conditions; the maximum integrated heat of adsorption was found at 273 K. The maximum temperature changes of the ANG system with the ZrBDC materials during the adsorption (charging) process did not exceed 14 K that are much lower than those reported for the systems loaded with activated carbons. The results obtained are of direct relevance for designing the adsorption-based methane storage systems for the automotive industry, developing new gas-power robotics systems and uncrewed aerial vehicles.

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