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Erschienen in: Adsorption 2/2020

13.05.2019

Evaluation of the thermal regeneration of an amine-grafted mesoporous silica used for CO2/N2 separation

verfasst von: Rafaelle G. Santiago, Rafael M. Siqueira, Caiuã A. Alves, Enrique Vilarrasa-García, Débora A. S. Maia, Moisés Bastos-Neto, Diana C. S. de Azevedo

Erschienen in: Adsorption | Ausgabe 2/2020

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Abstract

In view of the promising applicability of adsorption to the capture of CO2 from post-combustion gases, the use of mesoporous silica functionalized with 3-aminopropyltriethoxysilane (APTES) was studied as adsorbent in a fixed bed for CO2–N2 separation under thermal swings. Characterization of the adsorbent performed before and after functionalization indicated that amine grafting was successful. Additionally, CO2 adsorption on a magnetic suspension balance showed a significant increase in uptake of the APTES-functionalized sample over the support, mainly at low relative pressures. Relatively high values of adsorption enthalpy suggest the occurrence of chemical adsorption attributed to CO2 bonding with the amines. Breakthrough curves were measured for pure CO2, N2 and the CO2/N2 (15/75% v/v) mixture, which showed good agreement with respect to the uptake of the individual gases, as determined from gravimetric tests. Full CO2 desorption from the bed required a temperature rise, which suggests that these materials may be suitable for TSA cyclic processes. A temperature of 90 °C was enough for a complete regeneration of the adsorbent during the desorption phase under dynamic conditions. The material showed very stable behavior after 20 successive cycles.

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Metadaten
Titel
Evaluation of the thermal regeneration of an amine-grafted mesoporous silica used for CO2/N2 separation
verfasst von
Rafaelle G. Santiago
Rafael M. Siqueira
Caiuã A. Alves
Enrique Vilarrasa-García
Débora A. S. Maia
Moisés Bastos-Neto
Diana C. S. de Azevedo
Publikationsdatum
13.05.2019
Verlag
Springer US
Erschienen in
Adsorption / Ausgabe 2/2020
Print ISSN: 0929-5607
Elektronische ISSN: 1572-8757
DOI
https://doi.org/10.1007/s10450-019-00112-7

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