Mesoporous silica supported amine and amine-copper complex for CO2 adsorption: Detailed reaction mechanism of hydrophilic character and CO2 retention

Mesoporous silica SBA-15 was functionalized with various amines and then doped with copper II cation (Cu2+). The modified materials were tested for the retention of CO2 at room temperature using temperature-programmed desorption (CO2-TPD). Several parameters affecting the CO2 retention capacity (CRC...

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Bibliographic Details
Published in:Journal of molecular structure 2019-09, Vol.1191, p.175-182
Main Authors: Boukoussa, Bouhadjar, Hakiki, Aboubakr, Bouazizi, Nabil, Beltrao-Nunes, Ana-Paola, Launay, Franck, Pailleret, Alain, Pillier, Françoise, Bengueddach, Abdelkader, Hamacha, Rachida, Azzouz, Abdelkrim
Format: Article
Language:English
Subjects:
Amine functionnalized SBA-15
Carbon dioxide
Chemical Sciences
Hydrophilic character
Material chemistry
Mesoporous silica
Temperature-programmed desorption
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Summary:Mesoporous silica SBA-15 was functionalized with various amines and then doped with copper II cation (Cu2+). The modified materials were tested for the retention of CO2 at room temperature using temperature-programmed desorption (CO2-TPD). Several parameters affecting the CO2 retention capacity (CRC) such as the nature of amine groups, repetitive adsorption-desorption cycles and dispersion of copper were investigated. CO2-TPD and H2O-TPD allowed correlating the hydrophilic character with the CO2 retention capacity. The obtained results showed that amine-functionalized mesoporous materials containing their own moisture exhibit higher effectiveness in the retention of CO2. Triamine-functionalized SBA-15 displayed the highest CRC value as a result of the increase of the number of adsorption sites. Material reuse in three adsorption/desorption cycles revealed high stability with a slight decrease in CRC. The dispersion of copper induced a progressive decrease in the CRC value. The CRC decreased with increasing Cu2+ content due to competitive complexation of Cu2+ by the amino groups. [Display omitted] •Mesoporous silica SBA-15 was functionalized with various amines then doped with copper.•New functional SBA-15 high CO2 retention capacity.•The effect of amines nature on CO2 adsorptions were investigated.•Mesoporous silica provided a good reusability.
ISSN:0022-2860
1872-8014
0022-2860
DOI:10.1016/j.molstruc.2019.04.035