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Temperature. Samples of Ag-Y, Ag-X, and Ag-LSX were dehydrated under vacuum at temperatures ranging from 100 °C to 600 °C at times ranging from 1 hour to 24 hours. The samples were heated at approximately 20°C/min to “hold points” in 100 C intervals, the samples were then held for approximately 30 minutes before being ramped up to the next hold point. When the sample was raised to the desired final dehydration temperature, it was soaked at that temperature for a specified amount of time, then allowed to cool to room temperature with no further applied heating. Throughout this paper, samples are referred to as Ag-M-N, where M specifies the identity of the zeolite (X, Y, or LSX) and N denotes the dehydration temperature. Time. In order to determine the effect of dehydration time on cluster formation and the resulting adsorptive characteristics of Ag-LSX, a sample was vacuum dehydrated at 450 C for varying amounts of times, and the resulting N2 adsorption isotherms were measured. Atmosphere. Atmospheric effects on dehydration of Ag-LSX by controlling both sample drying and dehydration. Samples were treated in the following ways: (1) dried in a dark area at room temperature, then dehydrated under vacuum for 4 hours at 450 C, (2) dried in a standard convection oven at 100 C in air, then dehydrated under vacuum for 4 hours at 450 C, (3) heated slowly (< 10 °C/min) in a furnace to 450 C in air, then dehydrated under vacuum for 4 hours at 450 C. Neutron Activation Analysis. Chemical analysis was performed by neutron activation analysis (NAA) at 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 14PDF Image | PSA USING SUPERIOR ADSORBENTS
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