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

Publication date: Available online 8 April 2019Source: Journal of Molecular StructureAuthor(s): Bouhadjar Boukoussa, Aboubakr Hakiki, Nabil Bouazizi, Ana-Paola Beltrao-Nunes, Franck Launay, Alain Pailleret, Françoise Pillier, Abdelkader Bengueddach, Rachida Hamacha, Abdelkrim AzzouzAbstractThe mesoporous silica SBA-15 functionalized with various amines was prepared and then doped with copper (Cu++). 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) were investigated such as effect of the nature of amine groups, repetitive adsorption-desorption cycles and dispersion of copper. CO2-TPD and H2O-TPD were employed in order to correlate the hydrophilic character with the CO2 retention capacity. The obtained results showed that amines-functionalized mesoporous materials containing their own moisture have good results towards the retention of CO2. Especially the triamine-functionalized SBA-15 has the greatest CRC value which results in the increase of the number of adsorption sites. The reuse of these solids in three adsorption/desorption cycles showed higher stability with a slight decrease in CRC. The dispersion of copper showed a progressive decrease in the CRC value. The correlation between the Cu% and the CRC shows that the value of the CRC decreases with increasing Cu% due to complexation of the adsorption sites (amines) by acid sites (...
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research