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32 Results and discussion Table 3.4: Summary of CO2 adsorption properties for structured adsorbents grown on 400 cpsi supports. K k, s−1 56 0.072 32 5.2 to reach 50% of the final concentration occurred after ca. 900 structured adsorbents, respectively. This is in rough times higher zeolite loading per column volume for the latter sample. The breakthrough front of the NaX film grown on the 900 cpsi support is broader than that for the film grown on the 400 cpsi support, most likely as a result of dispersion attributed to mass transfer resistance or other features which contribute to dispersion (flow maldistribution etc). The broader breakthrough front of the former sample may be a result of the absence of small pores between 0.1 and 1 μm, which were detected on the sample grown on the 400 cpsi support by MIP, and which may influence the kinetic of adsorption in terms of higher mass transfer, resulting in sharper breakthrough fronts. Figure 3.12: Experimental CO2 breakthrough curves measured at 1 l/min for the about 1.5 μm thick NaX films grown in the clear solution on 400 and 900 cpsi cordierite monoliths (a) and NaX beads (b). Figure 3.12 (b) shows the CO2 breakthrough curve measured at 1 l/min for NaX beads. The time to reach 50% of the final concentration for the NaX beads is ca. 30 times longer than that for the sample grown in the clear solution on the 400 cpsi support, in rough accordance with the higher zeolite loading (ca. 54 times) per column volume for the former sample. The breakthrough front obtained for the NaX beads is significantly Sample NaX film grown in the synthesis gel NaX film grown in the clear synthesis mixture Deff, m2/s 1 · 10−13 4 · 10−12 21 and 62 s for the 400 and accordance with the ca. 1.8PDF Image | Structured Zeolite Adsorbents for PSA Applications
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