Sorption capacity of carbon material based on polymer raw materials with respect to methane

Abstract

The carbon material was synthesized from polymer raw materials (MC-032). He MC-032 has been characterized by various methods, including N2 adsorption-desorption at 77 K, X-ray diffraction analysis, Fourier transform IR spectroscopy, and Raman spectroscopy. The resulting adsorbent has a well-developed porous structure (SBET = 2722 m2/g; VDFT = 1.08 cm3/g). The adsorption of methane was studied in a wide range of pressures at temperatures above the critical one. The maximum adsorption value is ~ 14 mmol/g at 298.15 K and 100 bar. Experimental data on methane adsorption on MC-032 were analyzed using the Dubinin–Radushkevich adsorption model in the temperature range 298.15 – 323.13 K and pressures up to 100 bar. It has been established that the average relative deviations between the experimental results and the results obtained using the Dubinin-Radushkevich model are less than 4 %. It is shown that the differential molar heats of methane adsorption decrease from ~ 25 to ~ 10 kJ/mol. The calculated characteristic adsorption energies are in the range of 5.88 – 6.21 kJ/mol, which indicates that the process of methane adsorption on MC-032 belongs to physical adsorption. MC-032 carbon material has strong adsorption capacity for methane and has good prospects for controlling methane emissions and reducing greenhouse gases.