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3.1. General properties of structured adsorbents 21 Table 3.1: Film thickness and weight gain of NaX and MFI film samples grown in a gel and a clear solution. Zeolite Type of Film synthesis thickness, solution μm NaX gel 1.1 clear solution 1.5 ZSM-5 gel 1.9 clear solution 1.9 Weight gain gzeolite/gsample 0.060 0.036 0.16 0.10 Figure 3.2: XRD patterns of the NaX films grown in the gel and in the clear synthesis solution on 400 cpsi supports. The cordierite and NaX peaks are indicated by ◦, and ∗, respectively. most of the film is smooth and free from sediments as shown in Figure 3.3 (a), large agglomerates of crystals formed in the bulk of the synthesis solution have deposited by sedimentation in some areas, as shown in Figure 3.3 (e). Figure 3.3 (b) shows a top-view SEM image of a ZSM-5 film grown in a clear solution containing template molecules. The film covers the entire monolith surface and has a film thickness of 1.9 μm, see Figure 3.3 (d) and Table 3.1. The morphology of the film is completely different to the film grown in the gel and some cracks are observed. The morphologies of the two samples vary due to differences in relative growth rates in the various crystallographic directions in the synthesis gel and in the clear solution, respectively. Cracks are formed in the film prepared in the clear solution, due to con- traction of the crystals during calcination [51]. A few crystals originating from the bulk synthesis mixture and deposited on top of the film are observed only at certain locations on the sample, however fewer than when the films were grown with the synthesis gel.PDF Image | Structured Zeolite Adsorbents for PSA Applications
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