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Download fileCO2 Adsorption on Amine-Functionalized Periodic Mesoporous Benzenesilicas
journal contribution
posted on 2015-04-01, 00:00 authored by Kyohyun Sim, Nakwon Lee, Joonseok Kim, Eun-Bum Cho, Chamila Gunathilake, Mietek JaroniecCO2 adsorption was investigated on amine-functionalized mesoporous
silica (SBA-15) and periodic mesoporous organosilica (PMO) samples.
Hexagonally (p6mm) ordered mesoporous
SBA-15 and benzene-PMO (BPMO) samples were prepared in the presence
of Pluronic P123 block copolymer template under acidic conditions.
Three kinds of amine-containing organosilanes and polyethylenimine
were used to functionalize SBA-15 and BPMO. Small-angle X-ray scattering
and nitrogen adsorption isotherms showed that these samples featured
ordered mesostructure, high surface area, and narrow pore size distributions.
Solid-state 13C- and 29Si cross-polarization
magic-angle spinning NMR spectra showed chemical linkage between amine-containing
modifiers and the surface of mesoporous materials. The chemically
linked amine-containing modifiers were found to be on both the inner
and outer surfaces. N-[3-(trimethoxysilyl)propyl]ethylenediamine-modified
BPMO (A2-BPMO) sample exhibited the highest CO2 uptake
(i.e., ∼3.03 mmol/g measured on a volumetric adsorption analyzer)
and the fastest adsorption rate (i.e., ∼13 min to attain 90%
of the maximum amount) among all the samples studied. Selectivity
and reproducibility measurements for the A2-BPMO sample showed quite
good performance in flowing N2 gas at 40 mL/min and CO2 gas of 60 mL/min at 25 °C.
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surface areaBPMOacidic conditionsp 6mmCO 2 Adsorptionmesoporous materialsadsorption analyzerchemical linkagePluronic P 123 block copolymer templateNMR spectraadsorption rateCO 2 uptakeN 2 gasPMOSBAreproducibility measurementssampleCO 2 gasMesoporous BenzenesilicasCO 2 adsorptionmesoporous organosilicapore size distributionsnitrogen adsorption isotherms