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n/cm2/s. Two separate gamma-ray spectra were collected for 500 seconds real time for each sample using a high resolution germanium detector. The collection after a 13 minute decay was used to determine the concentrations of aluminum and silver, while data collected after1 hour and 56 min decay were used to analyze for sodium and potassium. Four replicates of NBS-SRM-1633a (coal fly ash) and silver foil were used as standard reference materials and check standards. Adsorption Isotherm Measurements. The adsorption isotherms were measured using a static volumetric system (Micromeritics ASAP-2010). Additions of the adsorbate gas were made at volumes required to achieve a targeted set of pressures. A minimum equilibrium interval of 5 seconds with a tolerance of 5% of the target pressure (or 5 torr, whichever is smaller) was used to determine equilibrium for each measurement point. X-ray Photoelectron Spectroscopy. X-ray photoemission spectra were obtained from thin wafers of the zeolites using a Perkin-Elmer PHI 5400 ESCA system with a Mg anode. A lack of surface charging was verified by measuring the binding energy of adventitious carbon. The generally accepted reference for the binding energy of C 1s photoelectrons is 285±0.2 eV.18 Samples of fully exchanged Ag-LSX zeolite which was (1) fully hydrated, (2) heated in a vacuum at 200 C, and (3) heated in a vacuum at 450 C were formed into very thin wafers using a laboratory press. The wafers were then degassed in the XPS staging cell at 10-8 - 10-9 torr for two days at room temperature prior to analysis. Powder Neutron Diffraction Data Collection. Powder neutron diffraction data were collected for Ag-Y-450, Ag-X-450, Ag-LSX-350, and Ag-LSX-450. Each of the samples was initially dehydrated under vacuum for 12 hours, as described in the sample 15PDF Image | PSA USING SUPERIOR ADSORBENTS
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