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

In view of the promising applicability of adsorption to the capture of CO 2 from post-combustion gases, the use of mesoporous silica functionalized with 3-aminopropyltriethoxysilane (APTES) was studied as adsorbent in a fixed bed for CO 2 –N 2 separation under thermal swings. Characterization of the...

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Bibliographic Details
Published in:Adsorption : journal of the International Adsorption Society 2020-02, Vol.26 (2), p.203-215
Main Authors: Santiago, Rafaelle G., Siqueira, Rafael M., Alves, Caiuã A., Vilarrasa-García, Enrique, Maia, Débora A. S., Bastos-Neto, Moisés, de Azevedo, Diana C. S.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Amines
Aminopropyltriethoxysilane
Carbon dioxide
Carbon sequestration
Chemistry
Chemistry and Materials Science
Desorption
Engineering Thermodynamics
Enthalpy
Fixed beds
Gravimetry
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Magnetic levitation
Organic chemistry
Regeneration
Separation
Silicon dioxide
Surfaces and Interfaces
Thermal regeneration
Thermodynamic properties
Thin Films
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Summary:In view of the promising applicability of adsorption to the capture of CO 2 from post-combustion gases, the use of mesoporous silica functionalized with 3-aminopropyltriethoxysilane (APTES) was studied as adsorbent in a fixed bed for CO 2 –N 2 separation under thermal swings. Characterization of the adsorbent performed before and after functionalization indicated that amine grafting was successful. Additionally, CO 2 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 CO 2 bonding with the amines. Breakthrough curves were measured for pure CO 2 , N 2 and the CO 2 /N 2 (15/75% v/v) mixture, which showed good agreement with respect to the uptake of the individual gases, as determined from gravimetric tests. Full CO 2 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.
ISSN:0929-5607
1572-8757
DOI:10.1007/s10450-019-00112-7