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zeolite X has shown a continuous loss of water over a broad range of temperatures, starting at slightly above room temperature up to 350 C with a maximum at about 250 C.4 Specific dehydration conditions varied from sample to sample and are given for each sample. Characterization. The samples were compositionally characterized using neutron activation analysis (NAA) in the research nuclear reactor of the Phoenix Memorial Laboratory at the University of Michigan. The samples were irradiated sequentially for one minute at a core-face location with an average thermal neutron flux of 2 x 1012 n/cm2/s. Two separate gamma-ray spectra were then collected for each sample with a high resolution germanium detector: one after a 13 minute decay to determine the concentrations of Al and Ag, and a second after a 1 hour and 56 min decay to analyze for Na and K; both were for 500 seconds real time. Four replicates of NBS- SRM-1633a (coal fly ash) and silver foil were used as standard reference materials and check standards. 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. The adsorption isotherms were measured using a static volumetric system (Micromeritics ASAP-2010). Additions of the analysis gas were made at volumes required to achieve a targeted set of pressures. A minimum equilibrium interval of 9 seconds with a tolerance of 5% of the target pressure (or 0.007 atm, whichever is smaller) was used to determine equilibrium for each measurement point. The pressure transducers 55PDF Image | PSA USING SUPERIOR ADSORBENTS
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