Abstract
AbstractThe adsorption properties of partially exchanged (Na,H) clinoptilolites and silanated H‐clinoptilolites have been investigated as a function of the degree of modification.A different sorption behaviour of N2, Kr and Xe in (Na, H) clinoptilolites is observed in three exchange regions. In samples having a proton loading lower than 10%, adsorption of N2 at 77K, Kr at 195K and Xe at 273K only occurs in the main channels parallel to the c‐axis. Diffusion of Kr into the small channels, which are blocked by the presence of Na+ ions, was observed at 273K. With a proton exchange of 10 to 70%, the small channels become accessible for all gas molecules. In higher exchanged samples (>70%), the maximum adsorption capacity is reached for N2 at 77K and Kr at 195K. The increase of the adsorption capacity with increasing proton content describes a sigmoïdal curve, characteristic of a percolation process.Structural modification by means of silanation reduces the adsorption of both N2 at 77K and Kr at 273K in a similar way, so that percolation was observed.
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