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OPTIMIZATION OF SYNTHESIS PROCEDURES FOR STRUCTURED PSA ADSORBENTS Alessandra Mosca a,* , Jonas Hedlund a , Firas Ridha b , Paul A. Webley b a Div. of Chemical Technology, Luleå University of Technology, SE-97187, Luleå, Sweden b Dept. of Chemical Engineering, Monash University, VIC-3800, Monash, Australia * Corresponding author. Tel. +46 920 491293, Fax +46 920 491199; E-mail: Alessandra.Mosca@ltu.se ABSTRACT Structured materials in the form of supported thin zeolite films may have superior mass and heat transfer properties compared to traditionally used zeolite powders, beads and extrudates. FAU zeolite is a suitable adsorbent for CO2 recovery from flue gas and O2 enrichment from air by PSA. In the present work, thin NaX films were grown on porous and dense cordierite monoliths by hydrothermal treatment using a gel or a clear solution. NaX films with a thickness of about 1 m could be grown on both supports using the gel. However, a relatively high weight gain after synthesis was observed for the porous monoliths due to zeolite crystallization in the pores and sedimentation onto the film surface of crystals formed in the solution, which may be undesirable for PSA applications. Dense and uniform films could be grown using the clear solution. The film consisted of NaX crystals and some sodalite crystals (shown by SEM and XRD). The thickness of the NaX film varied from about 0.5 m to 1 m, as shown in Fig.1. A much lower weight gain was observed and much less zeolite grew in the pores of the support, which should result in better mass and heat transfer properties. The CO 2 adsorption capacity measured at 273K for a 1 m NaX film grown on a porous monolith with the clear synthesis mixture was 0.2 mmol/g sample, which was 20 times lower than that measured for commercially available 13X beads. The pressure drop for the zeolite coated cordierite monolith was two orders of magnitude lower than that recorded for the beads, which may be a great advantage for PSA processes. Furthermore, the adsorption capacity for zeolite coated monoliths can easily be increased by growing thicker zeolite films and by using monoliths with higher cell density without a considerable increase in pressure drop. From the present study, it is concluded that zeolite coated monolith supports may be a competitive alternative to traditional PSA adsorbents. However, further investigations are needed in order to prove this hypothesis. 2 m (a) (b) Figure 1: Top-view (a) and side view (b) images of a 1 m NaX film grown on a 400 cpsi porous cordierite support using a clear solution.PDF Image | Structured Zeolite Adsorbents for PSA Applications
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