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that the support affects the film growth. Figures 1 (c, f) show images of a FAU film grown on a porous substrate using the gel. The film is more uniform with a thickness of about 1 m and no sodalite crystals are observed. However, because of crystallization in the monolith pores, a 5 times higher weight gain is observed for films grown in the gel, which may be a disadvantage for PSA applications. A 1.5 m FAU film with no sodalite crystals was grown on the porous support in the clear solution with a multiple-step synthesis with short hydrothermal treatments of 1 h and 20 min (not shown). XRD data contains the presence of FAU crystals in all samples. Figure 1. SEM images of faujasite films grown in the clear solution on porous (a, d) and on dense (b, e) cordierite supports, and of a FAU film grown in the gel (c, f) on porous support. CONCLUSIONS Thin faujasite films could be grown on porous and on dense cordierite supports from two different synthesis mixtures. Uneven FAU films with embedded sodalite crystals could be grown on both supports in the clear solution and long hydrothermal treatment. The weight gain after synthesis was very low and only a low amount zeolite was deposited in the pores of the support, which is an advantage for PSA applications. An even FAU film without sodalite crystals could be grown on both supports using the synthesis gel, but more zeolite was deposited in the pores of the support. REFERENCES [1] Todd R.S. and Webley P., Chemical Engineering Science 60 (2005) 4593-4608. [2] Li Y. Y. et al., Trans IChemE 76 Part A (1998) 931 – 941. [3] O. Öhrman et al., Stud. Surf. Sci. Catal., Elsevier, Amsterdam 2001, 20-P-09.PDF Image | Structured Zeolite Adsorbents for PSA Applications
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