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well defined zeolite films, the mass transfer resistance can be controlled by varying the film thickness 20. In our previous work 21-22 we have prepared structured adsorbents in the form of 1.5 m films of NaX zeolite grown on 400 cells per square inch (cpsi) cordierite monolith supports and evaluated the adsorption performance. Adsorption isotherms, pressure drop and breakthrough data for the structured adsorbent were compared with that for conventional adsorbents in the form of NaX beads. The main conclusion from our previous work was that structured adsorbents with higher cell density than 400 cpsi are needed to better exploit the potential of these novel materials for PSA processes. In the present work, we report the preparation of structured adsorbents with 400 and 900 cells per square inch and a NaX film thickness of about 1.5 m. Isotherm and breakthrough data were recorded experimentally for the materials. For the first time, the performance of these structured adsorbents in a vacuum swing adsorption cycle was simulated and the results compared with conventional adsorbents. 2. Materials development Ceramic cordierite monoliths with cell densities of 400 and 900 cpsi (Corning Inc.) were used as supports for growth of zeolite NaX films. The zeolite films were grown by a seeding method in a similar way to that described in previous works 21-23. Small FAU seeds were adsorbed electrostatically on the walls of the supports and were thereafter grown into zeolite films by hydrothermal treatment. This technique is very flexible and allows the control of the thickness and preferred orientation of the crystals in the film 24-27. During synthesis, the channels of the support were oriented vertically to reduce zeolite sedimentation from the bulk synthesis mixture on the walls of the substrate. A multistep procedure was used to grow the films. The hydrothermal treatment was carried out in 5 steps of 1 hour and 20 116PDF Image | Structured Zeolite Adsorbents for PSA Applications
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