Carbon adsorbents for methane storage: genesis, synthesis, porosity, adsorption

Меньщиков, И. Е.; Shiryaev, A. A.; Школин, А. В.; Высоцкий, В. В.; Khozina, E. V.; Фомкин, А. А.

doi:10.1007/s11814-020-0683-2

Cited by 21 publications

(13 citation statements)

References 61 publications

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“…an ultramicropore will contribute much less pore volume than a mesopore of identical 79,82,83,196,220,221 Table 1 Physical properties of commonly stored gas molecules as well as relevant molecules for porosimetry measurements surface area. 20,234,260 If a sample is mostly microporous and has a high total pore volume, this indicates that there are lots of or very deep micropores within the sample. Such a sample is advantageous for small molecule adsorption, especially at lower pressures.…”

Section: Pore Volumementioning

confidence: 99%

“…275,276 3.5. Grain density While gravimetric measures of porosity have historically been the metric associated with gas uptake increasingly, high volumetric capacity is desired in applications such as methane storage, 127,260,283 as well as CO 2 capture. 174,284,285 Various studies have shown that grain density is a good predictor of H 2 , CH 4 and CO 2 capacity, provided that this is balanced with appropriate pore size as well as high surface area and pore volume.…”

Section: Reviewmentioning

confidence: 99%

“…KOH is the primary reagent used for synthesis of activated carbons intended for physisorption of small molecules as it yields superior carbons with high surface area and pore volume, a high degree of microporosity and tuneable PSD. 20,79,127,220,233,249,[287][288][289] Nonetheless, physical activating agents such as CO 2 and steam, 77,249,260,288,290 as well as other 'traditional' chemical agents such as ZnCl 2 , H 3 PO 4 and NaOH continue to be explored. 152,252,[287][288][289]291,292 A summary of textural properties of carbons derived using a variety of activating agents is presented in Table 2.…”

Section: Controlling Porositymentioning

confidence: 99%

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Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

Blankenship

Mokaya

2022

Mater. Adv.

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Section: Pore Volumementioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Section: Controlling Porositymentioning

confidence: 99%

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Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

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Mokaya

2022

Mater. Adv.

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“…For example, a xenonconcentrating unit of the medicine xenon recycling system implies an efficient carbon adsorbent, with an average pore width between 0.6 and 1.2 nm, and a micropore volume exceeding 0.4 cm 3 /g [13]. However, there is no direct correlation between the adsorption performance of an adsorbent and its structural and energy characteristics [49]. Textural factors, including morphological features, pore size distribution, the density and nature of heteroatoms derived from a precursor, and activation procedure [50], should be taken into account.…”

Section: Structure and Morphology Characterization Of The Sic-ac Adsorbentmentioning

confidence: 99%

Peculiarities of Thermodynamic Behaviors of Xenon Adsorption on the Activated Carbon Prepared from Silicon Carbide

et al. 2021

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An activated carbon prepared from silicon carbide by thermochemical synthesis and designated as SiC-AC was studied as an adsorbent for xenon. The examination of textural properties of the SiC-AC adsorbent by nitrogen vapor adsorption measurements at 77 K, powder X-ray diffraction, and scanning electron microscopy revealed a relatively homogeneous microporous structure, a low content of heteroatoms, and an absence of evident transport macropores. The study of xenon adsorption and adsorption-induced deformation of the Si-AC adsorbent over the temperature range of 178 to 393 K and pressures up to 6 MPa disclosed the contraction of the material up to −0.01%, followed by its expansion up to 0.49%. The data on temperature-induced deformation of Si-AC measured within the 260 to 575 K range was approximated by a linear function with a thermal expansion factor of (3 ± 0.15) × 10−6 K−1. These findings of the SiC-AC non-inertness taken together with the non-ideality of an equilibrium xenon gaseous phase allowed us to make accurate calculations of the differential isosteric heats of adsorption, entropy, enthalpy, and heat capacity of the Xe/SiC-AC adsorption system from the experimental adsorption data over the temperature range from 178 to 393 K and pressures up to 6 MPa. The variations in the thermodynamic state functions of the Xe/SiC-AC adsorption system with temperature and amount of adsorbed Xe were attributed to the transitions in the state of the adsorbate in the micropores of SiC-AC from the bound state near the high-energy adsorption sites to the molecular associates.

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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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Carbon adsorbents for methane storage: genesis, synthesis, porosity, adsorption

Cited by 21 publications

References 61 publications

Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

Peculiarities of Thermodynamic Behaviors of Xenon Adsorption on the Activated Carbon Prepared from Silicon Carbide

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

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