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for sample C4 and very few for sample C5*1h20min. The fraction of sodalite crystals should thus be very small and should not affect the adsorption performance of the adsorbents. At 2 of about 16.5o and 27.8o, some minor unidentified reflections were observed for the film samples. 3.3 Nitrogen adsorption-desorption isotherms and pore size distribution The N2 adsorption-desorption isotherms expressed as mmol/gsample (gsample is the total weight of each sample including both zeolite and support) for a cordierite monolith support and the NaX coated supports are shown in Figure 5 (a). The amount of nitrogen adsorbed by the uncoated cordierite monolith is very low compared to the coated samples, which shows that the volume of nitrogen adsorbed by the coated samples mainly originates from the zeolite film and larger adsorbed amounts per gram sample is a result of higher zeolite loading for the film coated samples as discussed above. Although the thickness of the film grown in the clear solution with the multiple step synthesis procedure (sample C5*1h20min) is higher than the gel (sample G9), the amount of nitrogen adsorbed by 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. The contribution of the sediments to the total adsorption capacity in sample G9 was estimated from nitrogen adsorption data and SEM observations under the assumption that the observed nitrogen adsorption capacity (0.21 mmol/g sample) of sample C5*1h20min entirely stem from a 1.5 m film as follows. This assumption is supported by SEM observations. The adsorption capacity for the 1.1 m film in sample G9 should thus be about 0.15 mmol/g sample (0.21 mmol/g sample*1.1/1.5). The observed adsorption capacity for sample G9 was 0.43 mmol/g sample and the adsorption capacity of the sediments on this sample should thus be about 0.28 mmol/g sample (observed-film mmol/g sample). Sediments thus represent the main fraction of zeolite in sample G9, and their contribution to the total adsorption capacity is about 65%, whereas about 35% is due to adsorption in the film. Thus, the sediments, with their long 75PDF Image | Structured Zeolite Adsorbents for PSA Applications
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