Paper Number: 2707
Carbon dioxide sorption on gas bearing shale and halloysite
Lutyński, M.A.1, González G., M.Á.1, Sakiewicz P.2
1Silesian University of Technology, Faculty of Mining and Geology, Institute of Mining, ul. Akademicka 2, 44-100 Gliwice, Poland, marcin.lutynski@polsl.pl
2Silesian University of Technology, Faculty of Mechanical Engineering, Institute of Engineering Materials and Biomaterials, ul. Konarskiego 18, 44-100 Gliwice, Poland
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Sorption of CO2 on organic rich shales and clay minerals is becoming the focus of many investigation in recent years due to two reasons. First, unconventional gas reservoirs, such as shales, after methane depletion can serve as a potential place for CO2 storage. Secondly, some clay minerals have a high sorption capacity towards gases and therefore can be used in gas cleaning technologies (Air-pollution control) or CO2 capture.
The aim of this study was to compare Silurian gas shale from Lublin basin (eastern Poland) with halloysite mineral from Dunino deposit in south-western part of Poland. The shale in this study represented typical mineralogical composition of gas bearing shales found in Baltic-Podlasie-Lublin
Basin with high illite-smectite content and relatively low content of organic matter (1.1% TOC) [1]. Halloysite is a product of basalt weathering, a two-layer mineral belonging to the kaolinite subgroup and is represented by the same chemical formula Al2Si2O5(OH)4·nH2O. Although the dominant minerals in the rocks are different and belong to different clay minerals group high pressure sorption of CO2 was compared in order to verify to what extent clay minerals exhibit gas sorption properties.
For the purpose of the study a high pressure manometric sorption setup was used. Experiments were carried out on powdered (particle size <0.1 mm) and dried rock samples up to the pressure of approximately 6 MPa and in temperature of 45°C (halloysite) and 55°C (shale). Obtained experimental results were recalculated into absolute adsorption curves and fitted with Langmuir and D-R models.
Although the halloysite does not have any organic matter, sorption capacity of halloysite was almost three times higher than shale (Fig. 1). These results can be explained by the fact that over 30% of shale rock was composed of non-sorptive minerals (quartz, plagioclase, feldspars and calcite) whereas halloysite was in its almost pure form. The sorption capacity of shale and halloysite is much lower than other organic sorbents such as coal.
References:
[1] Kuila U. et al. (2014) Fuel 359: 359-373