Investigation of the adsoeption of xenon on NaX zeolite within a broad range of pressures and temperatures

Фомкин, А. А.; Serpinskii, V. V.; Bering, B. P.

doi:10.1007/bf00922035

Cited by 10 publications

(11 citation statements)

References 2 publications

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“…It should be noted that the behaviors of q st = f ( a ) are typical to gas adsorption in microporous adsorbents with high-energy adsorption sites. The similar dependences q st = f ( a ) were observed for adsorption of carbon dioxide and methane in Na-ZSM-5 and NaX zeolites [ 79 ], carbon dioxide in silicalite [ 80 ], methane in microporous-activated carbons [ 69 , 73 , 81 ], and even for adsorption of inert gases as neon [ 82 ] in rutile and krypton in AC [ 83 ]. For all these adsorption systems, the high values of q st are observed at the early stages of adsorption, when gas molecules occupy a large portion of micropores by binding to high-energy adsorption sites.…”

Section: Resultssupporting

confidence: 58%

“…Many researchers, for example, Bering et al [ 64 , 65 , 66 ], Barrer et al [ 67 ], Fomkin [ 68 , 69 ], Bülow et al [ 70 ] observed linear adsorption isosteres for numerous vapors and gases, including methane [ 40 , 41 , 42 , 71 ] and inert gases [ 72 ] adsorbed in microporous adsorbents. It was reported in [ 73 ] that the property of the linearity of adsorption isosteres in microporous adsorbents could be extended to the range of the compressed liquid state. Therefore, the highly dispersed state of adsorbed methane is responsible for methane storage in micropores without phase transition over wide intervals of super- and subcritical temperatures and pressures.…”

Section: Resultsmentioning

confidence: 99%

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Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

et al. 2020

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The present work focused on the experimental study of the performance of a scaled system of adsorbed natural gas (ANG) storage and transportation based on carbon adsorbents. For this purpose, three different samples of activated carbons (AC) were prepared by varying the size of coconut shell char granules and steam activation conditions. The parameters of their porous structure, morphology, and chemical composition were determined from the nitrogen adsorption at 77 K, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and scanning electron microscopy (SEM) measurements. The methane adsorption data measured within the temperature range from 178 to 360 K and at pressures up to 25 MPa enabled us to identify the most efficient adsorbent among the studied materials: AC-90S. The differential heats of methane adsorption on AC-90S were determined in order to simulate the gas charge/discharge processes in the ANG system using a mathematical model with consideration for thermal effects. The results of simulating the charge/discharge processes under two different conditions of heat exchange are consistent with the experimentally determined temperature distribution over a scaled ANG storage tank filled with the compacted AC-90S adsorbent and equipped with temperature sensors and heat-exchanger devices. The amounts of methane delivered from the ANG storage system employing AC-90S as an adsorbent differ from the model predictions by 4–6%. Both the experiments and mathematical modeling showed that the thermal regulation of the ANG storage tank ensured the higher rates of charge/discharge processes compared to the thermal insulation.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

et al. 2020

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“…According to [ 32 ], which summarized the thermodynamic functions of a large number of gas/microporous material adsorption systems, in most cases, the C a ( T ) dependence exhibited a local maximum at elevated temperatures. When adsorption achieved the high values, this maximum shifted towards lower temperatures, as was the cases of Xe [ 69 ] and CH 4 adsorption [ 70 , 71 ] in NaX zeolites, and CH 4 adsorption in the microporous silicon carbide-derived activated carbon labeled as AUK [ 33 ]. Therefore, we suggest that these regularities are general and will be observed in the studied adsorption systems with the increase in the values of methane adsorption, pressure, and temperature.…”

Section: Resultsmentioning

confidence: 99%

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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“…Additionally, the sample presents the smallest average pore size, which consists of a barrier for the diffusion of relatively bigger molecules such as Xe. (Fomkin et al 1975) It is important to note that all pure component isotherms presented Type-I feature, which is typical for the adsorption mechanism of supercritical gases in low pressure ranges. The sequence of adsorption preference and capacity of the studied gases for all adsorbents is directly proportional to the sequence of the critical temperatures of the gases.…”

Section: Pure Componentmentioning

confidence: 99%

Adsorption equilibria of O2, Ar, Kr and Xe on activated carbon and zeolites: single component and mixture data

et al. 2011

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This work provides a set of experimental data on the adsorption of pure component, binary and ternary mixtures on activated carbon sample and two different zeolites at 303 K and moderate pressures (up to 10 bar for mixtures). Pure component data were measured by gravimetry and mixture data by volumetry coupled with chromatography. Results encourage more research on new materials and enhancement of adsorption-based separation processes with the proposed target.

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Investigation of the adsoeption of xenon on NaX zeolite within a broad range of pressures and temperatures

Cited by 10 publications

References 2 publications

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

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

Adsorption equilibria of O2, Ar, Kr and Xe on activated carbon and zeolites: single component and mixture data

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