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empty system). The fact that the breakthrough curves for the empty column and the column loaded with an uncoated support overlaps, indicate that the breakthrough front is delayed by diffusion into the pores of the support resulting in dispersion in the breakthrough front. However, this dispersion is exactly counteracted by the acceleration of the breakthrough front that should be caused by the geometrical volume occupied by the monolith walls, which explains why the two breakthrough curves overlap. The time to reach 50% of the final concentration occurred after about 33 s for sample C4, see Table 2. The time to reach 50% of the final concentration is linked to the adsorption capacity and also morphology of the sample. The time to reach 50% of the final concentration for sample C4 is almost the same as for a monolith without film, due to the very low adsorption capacity and low zeolite loading of this sample, as discussed earlier. The breakthrough curves for this sample are therefore not discussed further. On the other hand, the time to reach 50% of the final concentration is about 76 s and 136 s for samples C5*1h20min and G9, respectively, see Table 2. These samples thus show a significant adsorption capacity, in accordance with the measured zeolite loading, as discussed above. The breakthrough front for the film C5*1h20min is characterized by a steep increase in the CO2 concentration compared to the other sample, indicating an even flow distribution in the monolith channels. The width (9 s) of breakthrough front of sample C5*1h20min is even smaller than for the uncoated monolith (17 s). This indicates that for the C5*1h20min sample, the flow pattern is close to ideal (virtually no axial dispersion) and that the resistance to mass transfer in the film is very low. MIP showed that the number of pores in the 1 m-100 m range is smaller for the C5*1h20min sample as compared to the uncoated monolith. The reduced macroporosity observed for the zeolite coated sample C5*1h20min probably explains the reduced dispersion of the breakthrough front compared to the breakthrough front observed for the uncoated 78PDF Image | Structured Zeolite Adsorbents for PSA Applications
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