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- W2073132003 abstract "Abstract The distribution of amino groups on amino-functionalized SBA-15 materials for CO 2 adsorption was studied by transmission electron microscopy (TEM) in combination with a staining technique using RuO 4 in order to analyze the influence of the aminated organic chains location on the CO 2 adsorption properties. Mesostructured amino-functionalized SBA-15 materials were obtained by co-condensation, grafting and impregnation using aminopropyl, AP(N), ethylene-diaminepropyl, ED(NN), diethylene-triaminepropyl, DT(NNN) and polyethyleneimine, PEI, as functionalizing agents. CO 2 adsorption isotherms of functionalized samples at 45 °C showed that both the adsorption capacity (mg CO 2 /g ads) and the efficiency of amino groups (mol CO 2 /mol N) depend on the functionalization technique and the amount of organic compound used. While samples synthesized by co-condensation showed negligible CO 2 uptake and efficiency, adsorbents prepared by grafting and impregnation presented significant CO 2 adsorption capacities but a dissimilar efficiency. Key differences in the location of aminated chains explained the performance of CO 2 capture for every adsorbent, being grafted samples the adsorbents where amino groups were better distributed, favouring CO 2 diffusion trough the whole structure." @default.
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- W2073132003 date "2012-08-01" @default.
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- W2073132003 title "Amino functionalized mesostructured SBA-15 silica for CO2 capture: Exploring the relation between the adsorption capacity and the distribution of amino groups by TEM" @default.
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- W2073132003 doi "https://doi.org/10.1016/j.micromeso.2012.03.053" @default.
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