Amine-modified MCM-41 mesoporous silica for carbon dioxide capture

Microporous and Mesoporous Materials, Volume 143, Issue 1, August 2011, Pages 174-179

Amine-modified MCM-41 mesoporous silica for carbon dioxide capture

Marília R. Mello (a, b), Delphine Phanon (b), Gleiciani Q. Silveira (a), Philip L. Llewellyn (b), Célia M. Ronconi (a)

cmronconi@vm.uff.br

a Instituto de Química, Universidade Federal Fluminense, Campus do Valonguinho, CEP 24020-141, Niterói, RJ, Brazil

b Laboratoire Chimie Provence, Universités d’Aix-Marseille I, II & III - CNRS, UMR 6264, Centre de Saint Jérôme, 13397 Marseille cedex 20, France

Abstract

Presents an easy way to obtain a material with CO2 sorption properties by using commercially available MCM-41.

In order to increase MCM-41 CO2 sorption capacity, 2.48 mmol g-1 of amine groups were anchored onto silica surface. By carefully chosing spectroscopic techniques – namely infrared diffuse reflectance spectroscopy and solid-state 13C and 29Si nuclear magnetic resonance – authors demonstrate that amino groups are covalently bounded to mesoporous silica and not just adsorbed on it. CO2 uptake by the samples was investigated by microcalorimetry experiments performed at 30 °C. The amine functionalized material, MCM-41-NH2, exhibited a higher uptake of CO2 at very low pressures compared with the nongrafted material. This material has potential for CO2 recovery at low pressures/concentrations.

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