Abstract
In this study, the adsorption of methane (CH4) on chabazite tuff from Bala, Turkey, and that of salt-treated forms (Na+, K+, Li+, Ca2+ and Mg2+) was investigated. Structural and thermal characterization of chabazite samples were examined using X-ray diffraction, X-ray fluorescence, thermogravimetry, differential thermal analysis and N2 adsorption methods. The heats of immersion of the zeolite samples were measured with a Calvet-type C-80 calorimeter. At 30 °C, the Q imm values for heat of immersion decreased in the following order: Mg-CHA (113.62 J g−1) > Li-CHA (112.82 J g−1) > CHA (108.50 J g−1) > Ca-CHA (99.82 J g−1) > Na-CHA (80.00 J g−1) > K-CHA (63.79 J g−1). Adsorption properties of methane for all chabazite samples were obtained at 0 and 25 °C pressures up to 100 kPa. It was found out that CH4 adsorption capacities of the natural and salt-treated chabazites at 0 °C (0.831–1.315 mmol g−1) were higher than those at 25 °C (0.672–1.163 mmol g−1) as expected.
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