Abstract
Methane adsorption in MPU-007 microporous carbon adsorbent with a wide pore size distribution was studied at a pressure as high as 40 MPa and the temperatures of 303, 313, 323, and 333 K. The maximum value of methane adsorption of 43.36 wt % was achieved at 303 K and 40 MPa. The isosteres of adsorption derived from the obtained data were satisfactorily approximated by a linear function in coordinates ln P–1/Т at a constant value of adsorption. The dependences of differential molar isosteric heats of methane adsorption in MPU-007 microporous adsorbent on the value of methane adsorption were calculated at the temperatures of 303, 313, 323, and 333 K. The heat of methane adsorption of 14 kJ/mol was constant at a filling of micropores as low as ≈5 mmol/g. Then it declined evenly to 8 kJ/mol at 25 mmol/g and 303 K and to 2 kJ/mol at 24 mmol/g and 323 K. Such a run of the curves describing the heats of adsorption versus adsorption value might be caused by a wide pore size distribution and the association processes in the adsorbate.
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Funding
The work was carried out within the framework of the State Task, project no. 01201353185. Experiments were performed with the use of equipment of the Center for Collective Use of the Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences.
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Fomkin, A.A., Pribylov, A.A., Tkachev, A.G. et al. Methane Adsorption in Microporous Carbon Adsorbent with a Bimodal Pore Size Distribution. Prot Met Phys Chem Surf 56, 1–5 (2020). https://doi.org/10.1134/S2070205120010074
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DOI: https://doi.org/10.1134/S2070205120010074