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3.1. General properties of structured adsorbents 25 3.1.3 Cell density of support, Papers D-E Figures 3.6 (a, b) show top-view SEM images of 400 and 900 cpsi cordierite monoliths. Cordierite grains form an uneven surface and some macropores are also observed between the grains. The walls are 100 or 70 μm thick for the 400 or 900 cpsi cordierite monolith, respectively, see Figure 3.6 (c, d) and large macropores with a size up to tens of microns are observed. Figure 3.6: Top-view and cross-sectional SEM images of the 400 (a, c) and 900 (b, d) cpsi ceramic cordierite monolith supports. The total pore volume as determined by MIP of the 400 and 900 cpsi supports were quite similar, ca. 0.24 and 0.19 cm3/g. However, the size distribution of the pores in the wall is narrower for the 900 cpsi support and shifted somewhat to smaller pore sizes, about 0.8 - 2 μm, compared to about 2 - 25 μm for the 400 cpsi support, as shown in Figure 3.7. The cumulative pore volume of the structured adsorbent sample in the form of a ca. 1.7 μm NaX film grown on the 900 cpsi support almost overlaps with that of the corresponding support, as expected, see Figure 3.7. However, the 1.5 μm NaX film on the 400 cpsi cordierite monolith displays pores in the range 0.01 - 1 μm, that are absent in the corresponding 400 cpsi support and in the ca. 1.7 μm NaX film grown on thePDF Image | Structured Zeolite Adsorbents for PSA Applications
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