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28 Results and discussion the latter is higher. This is due to the high zeolite loading caused by the presence of sediments on the latter sample, as discussed earlier. Under the assumption that the observed nitrogen adsorption capacity for the film grown in the clear solution (0.21 mmol/gsample) stems from a 1.5 μm film, the adsorption capacity for the 1.1 μm film grown in the gel should be about 0.15 mmol/gsample. However, the observed adsorption capacity for the structured adsorbent grown in the gel was 0.43 mmol/gsample, suggesting that the remaining 0.28 mmol/gsample stem from the sediments. On the basis of these results, as much as 65% of the adsorption capacity in the NaX film grown in the gel stems from the sediments, whereas only 35% originates from the film. The total mesopore volume per g zeolite of the NaX film samples grown in the clear solution and in the gel is equal to 0.08 and 0.02 cm3/gzeolite, respectively. The mesopore volume is an indication of the crystal intergrowth in the zeolite films, and the NaX film sample grown in the gel shows the lowest mesopore volume, indicating that this film is better intergrown than the one grown in the clear synthesis mixture with the multiple step synthesis procedure. Figure 3.8: N2 adsorption/desorption isotherms of NaX zeolite films grown in the clear synthesis solution and in the gel on 400 cpsi monoliths. Figure 3.9 shows a schematic representation (not drawn to scale) of the NaX films grown in the clear synthesis solution and in the gel, in concert with SEM and N2 ad- sorption results. The NaX film sample grown in the clear solution with the multiple step synthesis procedure consists of a 1.5 μm thick zeolite film of slabs of intergrown crystals with closed grain boundaries. The slabs are separated by some open grain boundaries and there are no sediments on top of the film. On the other hand, the NaX film sample grown in the gel consists of a 1.1 μm thick zeolite film of slabs of smaller and betterPDF Image | Structured Zeolite Adsorbents for PSA Applications
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