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Breakthrough measurements of CO2 through aminofunctionalised aerogel adsorbent at low partial pressure: experiment and modeling
Publikationstyp
Journal Article
Publikationsdatum
2013-09-13
Author
Institut
Enthalten in
Volume
184
Start Page
61
End Page
69
Citation
Microporous and Mesoporous Materials 184: 61-69 (2014)
Publisher DOI
Scopus ID
Publisher
Elsevier
Designing adsorbers for the CO2 removal from enclosed inhabited spaces demands the utilization of tailor made adsorbents and the determination of adsorption kinetics. As shown in previous studies aminofunctionalised aerogels are well suited for CO2 adsorption at low partial pressure due to their high CO2 adsorption capacity at low partial pressures in moist conditions and their ease of regeneration. To gain further insight into the adsorption kinetics of aminofunctionalised aerogels several breakthrough experiments were conducted in this work. An isothermal dispersed plug flow model using pore diffusion to describe the mass transport in the solid phase was applied to describe the breakthrough of the CO2 through the aerogel adsorbent. The aminofunctionalised aerogels exhibited a low heat of adsorption and consequentially a mild temperature increase during the adsorption process. Determination of bulk density was conducted by the measuring of the skeletal density and the specific pore volume of aminofunctionalised aerogel microparticles, a method showing good agreement with conventional bulk density determination for aerogel monoliths. From modeling the breakthrough experiments a pore diffusion coefficient of 3.4 × 10-6 m2/s could be established for both M-APTMS and T-APTMS functionalised aerogels. The established tortuosity was 3.8 for the M-APTMS and 3.7 for the T-APTMS functionalised aerogel. Using the pore diffusion constant the model was able to describe the breakthrough through the aerogel adsorbers of different lengths and at various flow speeds in dry and moist conditions. The established diffusion coefficient suggests that aminofunctionalised aerogels exhibit fast mass transport kinetics rendering them suitable as adsorbents for CO2 removal from enclosed inhabited environments.
Schlagworte
Aerogel
Aminofunctionalisation
Breakthrough measurements
CO adsorption 2
Mass transport kinetics
DDC Class
600: Technik
More Funding Information
The authors are grateful to the “BundesministeriumfürBildung und Forschung” (BMBF) for their financial support.