Study of thermal and CH4 adsorption properties

Abstract

In this study, the adsorption of methane (CH4) on zeolite from Sivas-Yavu region of Turkey and on forms treated with 1 M heavy metal nitrate solutions (AgYZ, Cu YZ and FeYZ) and 1, 3 and 5 M HCl solutions (HYZ, 3HYZ and 5HYZ) was investigated. Adsorption isotherms of methane by zeolite minerals were obtained using volumetric apparatus at 0 and 25 A degrees C up to 100 kPa. Natural and modified samples were characterized by X-ray fluorescence, X-ray diffraction (XRD), thermogravimetric/differential thermal analysis and nitrogen adsorption methods. Quantitative XRD analysis showed that the major components of the natural zeolite were clinoptilolite and mordenite, together with minor amounts of quartz, feldspar and clay mineral. Among all the modified forms, Fe-form of zeolite sample exhibited the highest adsorption capacity for CH4 at both temperatures. The adsorption capacity of CH4 on FeYZ increased from 0.597 to 0.796 mmol g(-1) as the temperature decreased from 25 to 0 A degrees C. In addition, uptake of CH4 on the adsorbents decreased with increasing acid concentrations.