Hydrogen (H2) adsorption on natural and cation-exchanged clinoptilolite, mordenite and chabazite

Abstract In this study, clinoptilolite (CLN), mordenite (MOR) and chabazite (CHA) from Turkey and those of H + -, Na + -, K + -, Li + -, Ca 2+ - 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, KNO 3 , LiNO 3, NaNO 3 , Mg(NO 3 ) 2 and Ca(NO 3 ) 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.