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The total mesopore volume per g zeolite is 0.08, 0.06, and 0.12 cm3/gz for C5400, C5900, and NaX beads, respectively, see Table 1. The mesopore volumes per gram zeolite for the structured adsorbents are quite similar, which is expected since the films were grown by identical procedures. The mesopore volume per g zeolite of the NaX beads is in the same range of data reported in literature (0.07 cm3/gz) 33 and also similar to that for the structured adsorbents. Figure 6 (a) shows the cumulative pore volumes (cm3/gs) determined by MIP of a 400 cpsi support and the structured adsorbent grown on the same support, sample C5400. The total MIP pore volume for the support is about 0.25 cm3/g. The steep increase of the cumulative pore volume in the region between about 25 m and 2 m corresponds to the pores in the wall of the support. Compared to the 400 cpsi support, the total pore volume is similar for the 900 cpsi support; see Figure 6 (b). However, the size distribution of the pores in the wall is narrower for the latter support and shifted to somewhat smaller pore sizes, about 0.8 - 2 m. The cumulative pore volume of the structured adsorbent sample C5900 almost overlaps with that of the corresponding support, as expected. However, the structured adsorbent sample C5400 displays pores in the range 0.01 - 1 m, which are absent in the corresponding 400 cpsi support, and in sample C5900. These pores should thus stem from the zeolite film in the structured adsorbent C5400 and may represent open grain boundaries and cracks in the film. A hypothesis is that these pores have formed as a result of the repeated (>10) activations at 300 C in a flow of dry gas prior to break through experiments of this sample. It is well known that FAU zeolite crystals contracts significantly upon dehydration37,38, which may result in the formation of cracks and open grain boundaries in the film. Sample C5900 has only been activated two times prior to breakthrough experiments and characterization by MIP. 121PDF Image | Structured Zeolite Adsorbents for PSA Applications
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