The effect of regeneration temperature on the adsorptive properties of Na-ETS-4 zeotype in successive adsorption/desorption cycles

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Samenvatting

In view of the sensitivity of Na-ETS-4 zeotype to temperature, the effect of regeneration temperature on its adsorptive performance was investigated in this work. Adsorption isotherms and uptake kinetics of nitrogen and methane were measured after applying a heat treatment at temperatures of 100, 135, and 165 C along with vacuum as thermal activation. Increasing the initial activation temperature in the 100–165 C range led to an increase in adsorption capacity due to the intra-pore water removal. At 100 kPa, methane uptake increased from 0.2 to 0.35 mol/kg and nitrogen uptake increased from 0.07 to 0.16 mol/kg. By applying successive regenerations at 100 and 135 C, the equilibrium/kinetic adsorption properties did not change. However, by successive regeneration of the adsorbent at 165 C, the equilibrium capacity (for methane from 0.35 to 0.1, for nitrogen from 0.16 to 0.1 mol/kg at 100 kPa) and diffusion time constant parameter (for methane from 0.02 to 7.16 × 10−5 s−1) decreased gradually. Also, structural changes of Na-ETS-4 under successive high-temperature (i.e., 165 C) regeneration were studied by XRD. A gradual reduction of Na-ETS-4 crystallinity was revealed after each regeneration at 165 C. However, Na-ETS-4 showed stable adsorption performance when using only vacuum as regeneration method.

Originele taal-2English
Pagina's (van-tot)450-459
Aantal pagina's10
TijdschriftChemical Engineering Research and Design
Volume199
DOI's
StatusPublished - nov 2023

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© 2023 Institution of Chemical Engineers

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