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dehydration protocol. The samples were exposed to atmospheric conditions during transport to the NIST Center for Neutron Research. In preparation for the diffraction experiment, roughly 10-15 g of each sample was dehydrated under vacuum (< 10-5 torr). Each sample was heated to the temperature which was used in the prior heat treatment. Samples were heated at a rate of approximately 10 °/min, held at constant temperature for a minimum of 4 hours, then were allowed to cool to room temperature. The samples were transferred to 50 mm long and 15.6 mm wide vanadium cans and subsequently sealed in a helium environment with low water and oxygen levels (< 10 ppm). Neutron diffraction data were collected using the 32 detector BT-1 neutron powder diffractometer at the NIST Center for Neutron Research NBSR reactor. Measurements were made using a Ge(311) monochromator with λ = 2.0783(2) Å (1 Å = 10-10 m) at ambient temperature. Data were collected over the range of 1.3 – 166.3° 2θ with a step size of 0.05°. The data collection time for each sample was approximately 8 hours. The BT-1 instrument is described at the NCNR WWW site (http://www.ncnr.nist.gov/). Results and Discussion Chemical Analysis. The unit cell compositions for each of the materials studied are listed in Table 1. Each zeolite analyzed has a silver content in excess of the expected value based upon aluminum analysis. This is mostly likely due to the presence of silver metal particles present on the outside surface of the zeolite crystallites. This phenomena has been seen previously in other Ag+-exchanged members of the faujasite family.14 Effect of Sample Preparation on Nitrogen Adsorption. Dehydration conditions, particularly the atmosphere, duration, and dehydration temperature used, 16PDF Image | PSA USING SUPERIOR ADSORBENTS
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