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m are observed. A few hydroxysodalite (HS) crystals with a typical ball-of-yarn habit and a diameter of about 1 m are also observed. The pores in HS zeolite are too small to allow any CO2 adsorption. Hydroxysodalite may form as a consequence of aluminium depletion 32 in the synthesis mixture during growth of zeolite X. Figure 3 (b) shows a cross-sectional image of the NaX film grown on the 400 cpsi support. Again, the crystals in the zeolite film appear to be well intergrown, and the film has an average thickness of approximately 1.5 m. Figure 3 (c) shows a top-view SEM image of sample C5900. The film appears quite similar to the film in sample C5400. However, the number and size of HS crystals embedded in the zeolite film on the 900 cpsi support was reduced compared to the film on the 400 cpsi support. Cordierite contains aluminum, and HS formation is probably reduced by more aluminum leaching from the 900 cpsi support, which has a larger external area per volume of support than the 400 cpsi support. The average thickness of the zeolite film on the 900 cpsi support is about 1.7 m, as shown in Figure 3 (d). Some zeolite crystals were also observed in the pores of the walls of both the structured adsorbents, see Figure 4. The weight gain is 0.036 and 0.054 g/(g sample) for sample C5400 and C5900, respectively, see Table 1. Thus, the weight gain is about 1.5 times higher for the latter sample. The geometrical external (wall) surface area per gram sample of the 900 cpsi support is about 1.4 times higher than the 400 cpsi support which accords well with the weight gain of the samples. The N2 adsorption- desorption isotherms recorded at 77 K expressed as mmol/g sample for the structured adsorbents and the NaX beads are shown in Figure 5 (a). The amount of nitrogen adsorbed increases in the order of C5400 < C5900 < NaX beads. The zeolite loadings estimated from nitrogen adsorption data as in previous work31 for the 400 and 900 cpsi structured adsorbents are, as expected, in approximate accordance with the measured weight gain, see Table 1. The zeolite loading of the NaX beads is equal to 0.83 gz/gs21, see Table 1, and is about 33 and 20 times higher than that for samples C5400 and C5900, respectively. 120PDF Image | Structured Zeolite Adsorbents for PSA Applications
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