In this study, clinoptilolite (CLN), mordenite (MOR) and chabazite (CHA) from Turkey and those of H+-, Na+-, K+-, Li+-, Ca2+- and mg(2+)- exchanged forms were investigated for hydrogen storage at 77 K using volumetric apparatus up to 100 kPa. Cation exchange procedures were carried out using 1.0 M HCI, KNO3, LiNO3, NaNO3, Mg(NO3)(2) and Ca(NO3)(2) solutions at 90 C for 5 h. Structural characteristics of these zeolite samples were investigated using XRD, XRF and N-2 adsorption techniques. Experimental results showed that the chabazite samples (0.474-1.082 wt %) had a higher hydrogen adsorption capacity than mordenite (0.224-0.337 wt %) and clinoptilolite (0.065-0.555 wt %) samples. The variations in the level of hydrogen adsorption of original and cation exchanged natural zeolites were discussed in terms of the induced differences in their structural properties. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.