Abstract
Ag-doped ZSM-5 and SSZ-13 zeolites were prepared synergistically by hydrothermal synthesis and liquid-phase ion exchange for the trace Xe and Kr capture by physical adsorption at room temperature and atmospheric pressure. The crystalline structure and textural characteristics of the as-synthesized samples were characterized by XRD, FT-IR, XRF, N2 physisorption and SEM in detail. Adsorption isotherms of Xe, Kr and N2 in the as-prepared zeolites were determined at 298 K to assess the adsorptive selectivities of Xe/N2 and Xe/Kr, and GCMC simulations were employed to investigate the adsorption mechanism of Xe in the Ag-exchanged zeolites. The results showed that Xe adsorption capacity and Xe/N2 selectivity in Ag-SSZ-13 are up to 2.22 mmol/g and 116 while those in Ag-ZSM-5 are evaluated to 1.97 mmol/g and 85 respectively, which are enhanced by the introduction of Ag+ ions greatly. The GCMC simulation revealed that the simulated isotherms are all fitted well with the experimental isotherm at the low-pressure range, and the electronic charge transfers from the Ag+ to Xe result in the adsorbed Xe mainly around Ag+ ions in zeolites, confirming that Ag+ ions are the adsorption sites to strengthen the Xe adsorption in zeolites.
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