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- W2025205310 abstract "Abstract In order to compare the adsorptive properties of nanoporous zeolites containing extraframework cations of different nature, we have studied the interaction of H 2 with Na-A, Ca-A, and Co,Na-A zeolites. Low temperature Fourier transform infrared (FT-IR) spectroscopy was used for the investigation, as this technique is highly sensitive and responsive to the nature of the gas/surface interaction and can in addition allow for the estimation of the adsorption enthalpy. In all cases the spectra of adsorbed H 2 have complex structure due to ortho/para splitting as well as to surface structural disorder. Na + and divalent Ca 2+ were found to induce almost similar perturbation on H 2 molecule, resulting in the shift of the H–H vibrational frequency of −86 cm −1 and −76 cm −1 respectively (as compared to the Raman frequency of gaseous H 2 ). The enthalpy of adsorption, estimated by the Variable Temperature Infrared (VTIR) method, is −13 ± 1 kJ mol −1 for the strongest adsorptive sites in Na-A and Ca-A samples. In the case of Co,Na-A the shift of the H–H frequency due to the formation of H 2 ⋯Co 2+ complexes is larger (ca. −180 cm −1 ) suggesting that the interaction can involve some, although small, chemical contribution." @default.
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- W2025205310 date "2011-07-01" @default.
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- W2025205310 title "Role of extraframework metal sites for hydrogen adsorption into the pores of a zeolite: FT-IR study" @default.
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- W2025205310 doi "https://doi.org/10.1016/j.ijhydene.2011.01.179" @default.
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