Acid treated mordenites as adsorbents of C₂H₄ and H₂ gases

In this study, a mordenite-rich tuff (M) from the Şile region (NW Turkey) was treated with HNO₃and H₂SO₄at various concentrations (1.0, 3.0 and 5.0 M) at 80 °C for 3 h. The adsorption properties of ethylene (C₂H₄) and hydrogen (H₂) on natural and that of acid forms were examined experimentally at 273 and 77 K and up to 100 kPa using volumetric instrument, respectively. All the samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), and nitrogen (N₂) adsorption methods. Some differences on XRD pattern were signed in between natural and acid modified samples according to the intensity, sharpness and crystallite degree of mordenite peaks. C₂H₄and H₂adsorption capacities of the original and acid treated mordenites were in the range of 0.762–0.876 mmol g⁻¹and 1.373–1.672 mmol g⁻¹at 273 and 77 K, respectively. The increasing retention values of C₂H₄and H₂after the acid treatments were analyzed in comparison with the structural changes.