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TPD study of the reversible retention of carbon dioxide over montmorillonite intercalated with polyol dendrimers by Abdelkrim Azzouz; Alina-Violeta Ursu; Denisa Nistor; Tudor Sajin; Elias Assaad; René Roy is a Materials Science article available to read on EtoBox.

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Organoclays with improved affinity towards carbon dioxide were obtained via montmorillonite intercalation with polyol and amino dendrimers having respectively hydroxyl or amino groups that act as adsorbing sites. Measurements through thermal programmed desorption (TPD) show that higher amounts of CO 2 than predicted by stoichiometry were retained by polyol organoclays, suggesting that more than one CO 2 molecule adsorb on each OH group. The latter displayed optimal base properties tailored for: (i) improved retention capacity of CO 2 by increasing their number; (ii) easy consecutive gas release upon slight heating owing to their weak basicity. Unlike amines, polyols display sufficiently weak basicity to exert only physical interaction towards carbon dioxide molecules. The reversible CO 2 adsorption-desorption equilibrium is discussed here in terms of acid-base interactions between the organoclay surface and surrounding CO 2 molecules. The results obtained herein open new prospects in obtaining microporous materials able to act as lungs that fix reversibly polluting gases.

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Author

Abdelkrim Azzouz; Alina-Violeta Ursu; Denisa Nistor; Tudor Sajin; Elias Assaad; René Roy

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0040-6031)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)