HYDROGEN STORAGE IN POROUS CARBON MATERIALS OBTAINED BASED ON SHUBARKOL COAL

Abstract

The aim of the research work was to study the hydrogen sorption properties of carbonized adsorbents obtained from coal from the Shubarkol deposit in Kazakhstan. The adsorbents were prepared by heat treatment with K2CO3. The morphological features of the obtained adsorbents were determined by the SEM method. The structure of the materials was confirmed using transmission electron microscopy (TEM). The results of the studies showed the largest specific surface area (653.024 m²/g), which determines its effective hydrogen sorption capacity. The adsorption-desorption isotherm of mesopores of the powdered carbonized adsorbent "Shubarkol:K2CO3" 1:0.5, 900ºC refers to a type I microporous material. The adsorption-desorption isotherm of the powdered carbonized adsorbent "Shubarkol:K2CO3" 1:1, 900ºC indicates that it has a macroporous or uneven solid surface of type II. In this regard, the powder "Shubarkol:K2CO3" 1:1 is recognized as the optimal material for storing hydrogen due to its high specific surface, developed microporous structure and ability to adsorb hydrogen.