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

Mello, Marília R. ; Phanon, Delphine ; Silveira, Gleiciani Q. ; Llewellyn, Philip L. ; Ronconi, Célia M.

Microporous and mesoporous materials, 2011-08, Vol.143 (1), p.174-179 [Periódico revisado por pares]

San Diego, CA: Elsevier Inc

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  • Título:
    Amine-modified MCM-41 mesoporous silica for carbon dioxide capture
  • Autor: Mello, Marília R. ; Phanon, Delphine ; Silveira, Gleiciani Q. ; Llewellyn, Philip L. ; Ronconi, Célia M.
  • Assuntos: Amine-modified MCM-41 ; Carbon dioxide capture ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; MCM-41 ; Mesoporous silica ; Porous materials ; Surface physical chemistry
  • É parte de: Microporous and mesoporous materials, 2011-08, Vol.143 (1), p.174-179
  • Descrição: An easy way to obtain a material with CO 2 sorption properties by anchoring 2.48 mmol g −1 of amine groups on commercially available MCM-41 is presented. A few carefully chosen spectroscopic techniques demonstrated that not only amine groups are covalently bounded to mesoporous silica but also the carbamate formation after CO 2 uptake experiments. Microcalorimetry experiments performed at room temperature showed that this material has potential for CO 2 recovery at low pressures/concentrations. [Display omitted] ► MCM-41 commercially available was covalently modified with 3-aminopropyl groups. ► Carbamate was formed as a product between the CO 2 and amine groups. ► MCM-41-NH 2 has CO 2 sorption capacity 5.8 times higher than that for MCM-41. This paper presents an easy way to obtain a material with CO 2 sorption properties by using commercially available MCM-41. In order to increase MCM-41 CO 2 sorption capacity, 2.48 mmol g −1 of amine groups were anchored onto silica surface. A few carefully chosen spectroscopic techniques – namely infrared diffuse reflectance spectroscopy and solid-state 13C and 29Si nuclear magnetic resonance – demonstrated that amino groups are covalently bounded to mesoporous silica and not just adsorbed on it. CO 2 uptake by the samples was investigated by microcalorimetry experiments performed at 30 °C. The amine functionalized material, MCM-41-NH 2, exhibited a higher uptake of CO 2 at very low pressures compared with the nongrafted material. The modified material presented heat of adsorption of −98 versus −32 kJ mol −1 for MCM-41 at low pressures. The mode of CO 2 uptake in MCM-41-NH 2 was both chemisorption at low pressures and physisorption at high pressures. Solid-state 13C nuclear magnetic resonance performed on amine-functionalized MCM-41 after CO 2 adsorption experiments, showed a signal attributed to carbamate that was formed as a product of the reaction between CO 2 and amine groups. This material has potential for CO 2 recovery at low pressures/concentrations.
  • Editor: San Diego, CA: Elsevier Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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