Abstract
The effect of small amounts of water in inhibiting the adsorption of N2 gas on different cationic forms of LSX zeolite was investigated using thermogravimetric and derivative thermogravimetry (TG-DTG) techniques at different heating rates, which is shown to be a very effective way of studying the influence of strongly adsorbed water on adsorption of less-strongly adsorbed N2 molecules. According to DTG profiles, the apparent activation energies (E) relating to the thermal desorption of water molecules existing in the skeleton of Na- and Li-LSX zeolites were estimated through both the Kissinger and Flynn–Wall–Ozawa methods. The E values calculated from these two equations were in close agreement, and the thermal dehydration mechanism was further studied on the basis of the Coats–Redfern method. Moreover, the observations for the exponential declination of N2 adsorption amount with the loading of water revealed that the adsorption capacity of cationic zeolites was significantly influenced by water through r...
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