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adsorbent was sharper than the front for an empty adsorption column and only shifted in time. This indicates that the flow distribution in the adsorbent is even and that the mass transfer resistance in the film is very low due to the small film thickness and high effective diffusivity for CO2 in the NaX film and still, the adsorption capacity is considerable. The even flow distribution, very low mass transfer resistance and low pressure drop in combination with considerable adsorption capacity in this adsorbent indicates that it is a promising adsorbent for PSA applications. The findings from the present work will be important for the development of structured adsorbents to use as a competitive alternative to traditionally used adsorbents in PSA. Keywords: Structured adsorbents, NaX film, monolith, CO2 adsorption 1. Introduction Pressure swing adsorption (PSA) is a commonly used technology for gas separation which is relying on selective adsorption of one of the components in a gas mixture at elevated pressure on certain materials, such as zeolites [1-4]. A typical PSA system involves a number of connected columns containing adsorbent material that undergo successive pressurization and depressurization steps in order to produce a continuous stream of purified product gas. Zeolites are porous crystalline aluminosilicates of SiO44- and AlO45- tetrahedra connected by oxygen bridges [5]. Zeolites are widely used in PSA gas separation processes and are particularly suitable for oxygen enrichment from air by PSA (low silica zeolite X) [6 – 10] or H2 recovery from refinery fuel gas or coke oven gases [38, 56], whereas zeolite 5A is used in carbon-zeolite layered beds to obtain a high purity ( >99.99%) hydrogen stream. Zeolite NaX is particularly suitable for carbon dioxide capture from flue gas or oxygen enrichment from air by PSA [6-10]. CO2 and N2 are adsorbed in the zeolite pores due to the strong quadrupolar interaction between the molecules and the electric field generated by the charge balancing cations in the micropores of the zeolite [5]. The possibility to exchange the 62PDF Image | Structured Zeolite Adsorbents for PSA Applications
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