Amine-modified ordered mesoporous silica: Effect of pore size on carbon dioxide capture
Three mesoporous silica materials with different pore sizes (33 Å for small pore size MCM-41; 38 Å for SBA-12; 71 Å for large pore size SBA-15) and pore connectivity (2D for MCM-41 and SBA-15-type materials; 3D for SBA-12 material) were prepared and functionalized with aminopropyl (AP) ligands by po...
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Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 144; no. 2; pp. 336 - 342 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.10.2008
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Three mesoporous silica materials with different pore sizes (33
Å for small pore size MCM-41; 38
Å for SBA-12; 71
Å for large pore size SBA-15) and pore connectivity (2D for MCM-41 and SBA-15-type materials; 3D for SBA-12 material) were prepared and functionalized with aminopropyl (AP) ligands by post-synthesis treatment. The materials were characterized by small angle X-ray scattering (SAXS), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and nitrogen adsorption/desorption experiments. The carbon dioxide sorption on modified mesoporous molecular sieves was investigated by using of microbalances at 25
°C, and the influence of pore size and pore architecture on CO
2 sorption was discussed. The large pore silica, SBA-15, showed the largest carbon dioxide sorption capacity (1.5
mmol/g), relating to highest amine surface density in this material. On the other hand, three-dimensional accessibility of amine sites inside the pores of SBA-12 silica resulted in a faster response to CO
2 uptake in comparison with MCM-41 and SBA-15 molecular sieves. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1385-8947 1873-3212 |
DOI: | 10.1016/j.cej.2008.07.025 |