Isotherms, thermodynamics and kinetics of methane-shale adsorption pair under supercritical condition: Implications for understanding the nature of shale gas adsorption process

CO2-enhanced shale gas recovery (CO2-ESGR) sequestrates anthropogenic CO2 and improves the profitability of shale gas exploitation. This work investigated the adsorption behaviors of CO2 and CH4 on shale from China at 20, 40, 60 and 80 °C. The pressure ranges for CO2 and CH4 were 1–5 and 1–15 MPa, respectively. The excess adsorbed amount of CH4 increased with increasing pressure from the beginning to the end, while the maximum excess CO2 adsorption was observed at approximately 4 MPa. The absolute average deviations (AADs) of CO2 and CH4, determined by the Langmuir + k model, were 2.12–3.10% and 0.88–1.11%, respectively. Relatively good adsorptivity for CO2 was exhibited when the pressure was less than 5 MPa, which was beneficial to the implementation of CO2-ESGR. With continuous increases in pressure, the adsorption capacity of CO2 was weaker than that of CH4, suggesting that the injected CO2 would reduce the partial pressure of CH4 for CO2-ESGR and the displacement effect would no longer be significant. In addition, the adsorption rate of CO2 was much faster than that of CH4. CO2 was more active in the competitive adsorption and it was advantageous to the efficiency of CO2-ESGR.

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Adsorption Kinetic Behaviour of Pure CO2, N2 and CH4 in Natural Clinoptilolite at Different Temperatures

Adsorption Science & Technology ◽

10.1260/02636170360699831 ◽

2003 ◽

Vol 21 (1) ◽

pp. 81-91 ◽

Cited By ~ 20

Author(s):

Gelacio Aguilar-Armenta ◽

María E. Patiño-Iglesias ◽

Roberto Leyva-Ramos

Keyword(s):

Natural Zeolite ◽

Contact Time ◽

Adsorption Process ◽

Gas Adsorption ◽

High Vacuum ◽

Adsorption Kinetic ◽

Different Temperatures ◽

Natural Clinoptilolite ◽

T Values ◽

Kinetics Of

The adsorption kinetics of pure CO2, N2 and CH4 on a natural clinoptilolite (ZSL) sample from Villa de Reyes (San Luis Potosí, México) were measured at different temperatures using a glass, high-vacuum volumetric system. The ability of the natural zeolite to adsorb these gases depended on the gas–adsorbent contact time, t. For short values of t, the gas adsorption uptakes decreased in the order CO2 >> N2 > CH4. However, for long t values, the adsorption uptakes decreased in the sequence CO2 > CH4 > N2. It was established that the activation energies (kJ/mol) for the adsorption process increased in the following order CO2 (15) < N2 (18) < CH4 (40), correlating fairly well with the increasing order of kinetic diameter (Å) of the molecules: CO2 (3.3) < N2 (3.64) < CH4 (3.8). In comparison to the ZSL sample, the rate of adsorption of N2 and CH4 on H-ZSL increased and the total adsorption capacity decreased. The ZSL sample may be recommended as an effective adsorbent for the separation of CO2/CH4 and N2/CH4 mixtures.

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Thermodynamics and Kinetics of the Adsorption for Phenanthrene onto CTMA-Bentonite in Aqueous Solutions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.233-235.1089 ◽

2011 ◽

Vol 233-235 ◽

pp. 1089-1092 ◽

Cited By ~ 1

Author(s):

Jian Min Ren

Keyword(s):

Adsorption Process ◽

Adsorption Equilibrium ◽

Order Kinetic ◽

Dominant Mechanism ◽

Thermodynamics And Kinetics ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Thermodynamic And Kinetic Parameters ◽

Adsorption Rates ◽

Kinetics Of

The adsorption thermodynamic and kinetic parameters of phenanthrene onto CTMA-bentonite were studied. The result shows that adsorption equilibrium time at their initial concentrations of 2 mg.L-1 and 6 mg. L-1 is 110 min. The dynamical data for the organoclay fit well with pseudo-second-order kinetic model at 303-333 K. The adsorption rates was found higher with the temperature increased, but its sorption extent was lower. Thermodynamic parameters such as ΔG0, ΔH0, ΔS0 were also evaluated. The overall adsorption process was spontaneous, exothermic physisorption. The isotherms for phenanthrene on the organoclay are linear and showed that partitioning was the dominant mechanism of phenanthrene on CTMA-bentonite.

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Mechanisms of shale gas adsorption: Evidence from thermodynamics and kinetics study of methane adsorption on shale

Chemical Engineering Journal ◽

10.1016/j.cej.2018.11.185 ◽

2019 ◽

Vol 361 ◽

pp. 559-570 ◽

Cited By ~ 54

Author(s):

Lei Chen ◽

Luo Zuo ◽

Zhenxue Jiang ◽

Shu Jiang ◽

Keyu Liu ◽

...

Keyword(s):

Shale Gas ◽

Gas Adsorption ◽

Methane Adsorption ◽

Kinetics Study ◽

Thermodynamics And Kinetics

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Irradiation behavior of pyrolytic silicon carbide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074288 ◽

1983 ◽

Vol 41 ◽

pp. 72-73

Author(s):

R. J. Lauf

Keyword(s):

Silicon Carbide ◽

Fission Products ◽

Thermodynamics And Kinetics ◽

Neutron Fluences ◽

Fuel Particles ◽

Sic Coatings ◽

Irradiation Behavior ◽

Kinetics Of ◽

Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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