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Chapter 2 Experimental 2.1 Preparation of structured adsorbents, Papers A- F Two types of films (NaX and ZSM-5) with controlled thicknesses were grown on the walls of ceramic cordierite supports by a seeding method, similarly as described previously by O ̈hrmanetal. [43]. ThesupportswereseededwithcolloidalMFIcrystals(60nm)orFAU crystals (80 nm) as described in previous works [43, 44]. A film was then grown on the seeded surface of the supports by hydrothermal synthesis in an autoclave or under reflux at atmospheric pressure, rinsed, and then dried in a ventilated oven. The film growth method is very flexible and allows for control of the thickness and preferred orientation of the crystals in the film [45, 46, 47, 48]. In addition, some adsorption as well as diffusion properties of ZSM-5 films prepared with the method have been reported [42]. The film preparation procedures are briefly described below, details are reported in papers A, B, and C, and in references therein. 2.1.1 Pre-treatment of ceramic cordierite monoliths The supports used for zeolite film growth were ceramic cordierite monoliths with 100 (Rauschert Inc.), 400 (Corning), 900 (Corning) cpsi, see Figure 2.1. All supports were cut to a cylindrical shape (2 cm diameter and about 11 cm long) from the original monolith, and, prior to zeolite film growth, the samples were rinsed in toluene, acetone, and finally in a 0.1 M NH3 solution. The supports were then dried at 110◦ C in a ventilated oven, and thereafter cooled to room temperature and stored in a desiccator. Table 2.1 summarizes the geometrical properties of the structured substrates. 13PDF Image | Structured Zeolite Adsorbents for PSA Applications
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