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Figure 7 shows the cumulative pore volumes (cm3/g sample) determined by MIP of a support and the NaX film samples G9, C4, and C5*1h20min, see Figure legend for details. In the region between 80 and 2 m, the cumulative pore volume shows a steep increase for the uncoated support as well as for samples C4 and G9, probably due to Hg filling the pores in the walls of the monolith (wall thickness about 100 m). Sample C5*1h20min shows a lower pore volume between 80 and 2 m, which indicates that this film blocks the pores in the monolith walls for mercury intrusion, by pore filling, similarly to capillary condensation phenomena at a certain relative pressure, likely since this film is the thickest and thus blocks some of the macropores in the monolith wall. Below 2 m, down to 7 nm (MIP detection limit) all film samples feature a similar cumulative pore volume, indicating open grain boundaries in the films, as observed by SEM and nitrogen sorption. 3.5 Characterization of breakthrough properties 3.5.1 Qualitative interpretation of CO2 breakthrough profiles Figure 8 (a) shows the CO2 breakthrough curves measured at a volumetric flowrate of 0.2 l/min. The time to reach 50% of the final concentration occurred after about 28 s both for the empty column and the column loaded with an uncoated support, see also Table 2. The shape of the breakthrough front is sharp and the breakthrough curves for the empty column and the uncoated substrate are almost completely overlapping. This indicates that the observed dispersion might not due to the support but rather to dispersion in the tubing and valves of the system. Since the curves are overlapping, the widths of the breakthrough curves, defined as the difference between the time to reach 5% and 95% of the final concentration [44], were ca 17 s, both for the empty column and the column loaded with the uncoated monolith substrates. This result indicates that the gas velocity is uniform in all the channels of the uncoated monoliths. The volume of the empty column and all pipes in the system is about 167 cm3 and the geometrical volume of the monolith walls is as much as 41 cm3 (25 % of the 77PDF Image | Structured Zeolite Adsorbents for PSA Applications
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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