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adsorption performance of the zeolite monolith was compared with that of 5A zeolite pellets (1.5 mm in diameter and 3.6 mm long) used for the production of oxygen enriched air. The main outcomes of the work were that the adsorption performance of the zeolite monolith was of the same magnitude as the pellets whilst the pressure drop through the zeolite monolith was 3-5 times lower than that for the packe bed. The lower pressure drop resulted in a 3-5 times faster pressurization time when the PSA unit was loaded with the zeolite monolith. Shorter pressurization time is an advantage [14, 19, 22, 51] and allows faster PSA cycles which results in a higher productivity and should compensate for the lower adsorbent loading when using monoliths instead of traditional adsorbents [51]. Possible ways of improving the separation performance of the zeolite monoliths would thus be to reduce further the mass- and heat-transfer resistance by reducing the wall thickness and increasing the cell density of the zeolite monolith [12, 51]. In the present work, another approach, i.e. zeolite coated monoliths, was pursued to arrive at adsorbent monoliths with low mass and heat transfer resistance. Instead of preparing zeolite monoliths, very thin zeolite NaX films with thicknesses ranging from 0.4 to 1.5 m were grown on 400 cpsi cordierite monoliths to arrive at zeolite coated monoliths. The zeolite coated monoliths were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), N2 adsorption and desorption at liquid nitrogen temperature and CO2 adsorption breakthrough profiles. 2. Experimental section 2.1 Synthesis A seeding method was used for zeolite film growth on monoliths. The method is very flexible and allows for control of the thickness and preferred [23-25] orientation of the crystals in the film. In addition, the adsorption [26, 27] as well as diffusion [28, 29] properties of the film has been studied and reported. In the present work, cordierite monoliths 65PDF Image | Structured Zeolite Adsorbents for PSA Applications
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