期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 16, 页码 11095-11102出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00581g
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资金
- FAPERJ (JCNECNE grants)
- FAPERJ (CNE grants)
- FAPERJ (Pensa Rio grants)
- CNPq [550572/2012-0, 478302/2012-6]
- CAPES (T.C.S. fellowship)
- CNPq research fellowships
Adsorption of CO2 on MCM-41 functionalised with [3-(2-aminoethylamino)propyl]trimethoxysilane (MCM-41-N2), N-1-(3-trimethoxysilylpropyl)diethylenetriamine (MCM-41-N3), 4-aminopyridine (MCM-41-aminopyridine), 4-(methylamino)pyridine (MCM-41-methylaminopyridine) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (MCM-41-guanidine) was investigated. The amine-functionalised materials were characterised by Si-29 and C-13 solid-state nuclear magnetic resonance, N-2 adsorption/desorption isotherms, X-ray diffraction and transmission electron microscopy. CO2 adsorption at 1.0 bar and 30 degrees C showed that the amount of CO2 (n(ads)/mmol g(-1)) adsorbed on MCM-41-N2 and MCM-41-N3 is approximately twice the amount adsorbed on MCM-41. For MCM-41-aminopyridine, MCM-41-methylaminopyridine and MCM-41-guanidine, the CO2 adsorption capacity was smaller than that of MCM-41 at the same conditions. The proton affinity (computed with wB97x-D/6-311++ G(d, p)) of the secondary amino groups is higher than that of the primary amino groups; however, the relative stabilities of the primary and secondary carbamates are similar. The differential heat of adsorption decreases as the number of secondary amino groups increases.
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