Energetic effects of adsorption of C₆-C₈hydrocarbons on hard coal samples of different metamorphism

Abstract

Abstract. The analysis of sorption equilibrium of aliphatic saturated and unsaturated hydrocarbons on low and medium rank coals were performed. Isosteric sorption enthalpy correlation with the degree of fill of sorption capacity was presented for the low rank coal. There was found a crucial role of primary pore structure in the coal grains in the process of sorption, especially in case of temperature anomalies occurrence. Hexane differently than other hydrocarbons of longer chains, represent the property of micropore penetration. Due to literature the presence of double bound in other molecules causes difficulties with penetration into porous structure of coal.

Surface thermodynamics of hydrocarbon vapors and carbon dioxide adsorption on shales

“…Based on the assumption that an organic pore is hydrophobic and a mineral pore is hydrophilic, three vapors, water, hexane and nitrogen, were used to probe the surface area of different shales (30). Energetic effects of adsorption of heptane, heptene, octane, hexene and hexane on hard coal samples of different metamorphism were studied, which shows that hexane behaves differently than other hydrocarbons of longer chains which may represent micropore penetration (31). Adsorption properties of hydrocarbons (n-decane, methylcyclohexane and toluene) on clay minerals were investigated, which shows that the adsorption properties of n-decane, methyl cyclohexane and toluene are associated with the specific surface areas, the pore volumes of mesopores and equilibrium pressures (32).…”