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The samples were also analyzed for Li content using an inductively coupled plasma mass spectrometer (ICP-MS, Hewlett Packard HP 4500). The samples were first digested in concentrated nitric acid solution at 100 C for 20 min. At the end of digestion, the samples were further diluted and filtered before the ICP-MS analyses. Results of these analyses are given in Table 1. The unit cell compositions for those analyzed samples are given in Table 2. From this point, all samples will be identified according to the type of zeolite and the number of charge compensating cation(s) present in a unit cell. For example Li86-X refers to an X-type zeolite (with Si/Al 1.25) that has been fully exchanged to contain 86 Li+ cations per unit cell. The sample Li94.2Ag1.1Na0.7-LSX refers to a low silica X-type zeolite (with Si/Al = 1.0) that contains, on average, 94.2 Li+, 1.1 Ag+ (or other form of Ag) and 0.7 Na+ per unit cell, as determined from the neutron activation (NA) and ICP- MS analyses. Structural Characterization A separate set of mixed Li,Ag-LSX zeolites was prepared using the previously described procedure. These samples were used in the structural characterization. They were chemically characterized using neutron activation analysis (as described earlier). The unit cell composition for each of the materials is listed in Table 3. Neutron Powder Diffraction Powder neutron diffraction data were collected for each of the samples shown in Table 3. Each of the samples was initially dehydrated under vacuum for 12 hours at a prescribed temperature (as given in the sample name). The samples were exposed to atmospheric conditions during transport to the NIST Center for Neutron Research. In 91PDF Image | PSA USING SUPERIOR ADSORBENTS
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