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Abstract:In this study, the adsorption of methane (CH 4) capacities onto natural mordenite obtained fromİzmir, Turkey, and its cationic forms (CuM, AgM, FeM, and HM samples) were investigated at the temperatures of 0 and 25• C up to 100 kPa. Natural and modified samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF),Fourier transform infrared (FT-IR), thermogravimetry (TG-DTG), differential thermal analysis (DTA), scanning electron microscopy (SEM) coupled with energy dispersion spectroscopy (EDS), and N 2 adsorption methods. Quantitative XRD analysis showed that the major component of the natural zeolite was mordenite, together with minor amounts of quartz, feldspar, and clay mineral. The specific surface area and microporosity of the mordenite sample decreased notably after Ag cation exchange treatment. It was found that the adsorption capacity and the affinity of CH 4 with mordenite samples depended mainly on the type of exchanged cations and increased as HM < FeM < CuM < M < AgM for 25• C. The uptake of methane increased as HM < FeM < CuM < AgM < M for 0 • C. Capacity of mordenites for CH 4 ranged from 0.237 mmol g −1 to 0.528 mmol g −1 .

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ABSTRACT:The adsorption of ethylene (C 2 H 4 ) on five clay minerals (sepiolite, two kaolinites and two bentonites) and on forms treated with 1 M HCl solution (SH, K1H, K2H, B1H and B2H) was investigated. Adsorption isotherms for ethylene on all clay minerals were obtained at 4 °C and 20 °C up to 37 kPa. X-Ray diffraction (XRD), thermal analysis (TG/DTA) and N 2 adsorption analysis were used for structural and thermal characterization. It was found that the extent to which ethylene gas was adsorbed by natural and acid-treated sepiolites (0.424-0.859 mmol/g) was higher than that exhibited by natural and acid-treated bentonites (0.068-0.144 mmol/g) and by kaolinites (0.014 -0.061 mmol/g) at both temperatures. The uptake of ethylene on the acid-treated clays increased in the order K1H < K2H < B1H < B2H < SH.

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