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Adsorption of CO2 onto amine-grafted mesoporous silicas

机译：胺接枝介孔二氧化硅对CO2的吸附

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摘要

The characteristics and CO2 adsorption of mesoporous silicas including MCM-41, SBA-15, and pore-expanded MCM-41 with pore size in a range of 2-17 nm, modified by mono-, di-, and tri-aminosilanes were examined in this study. The adsorption data show that SBA-15 possessing a proper pore size accommodated amines exhibit the best CO2 adsorption capacity as 2.41 mmol CO2/g at 333 K. The corresponded CO2 adsorption efficiencies, represented by CO2/N molar ratios, were as high as of 0.5-0.7, an indication of the adsorption being sufficiently close to thermodynamic equilibrium. The CO2 adsorption mechanism of the amine-functionalized mesoporous silica is proposed. The adsorption of the grafted amine under anhydrous CO2 can be considered to proceed through carbamate intermediate and zwitterion mechanism.
机译：研究了由单，二和三氨基硅烷改性的介孔二氧化硅（包括MCM-41，SBA-15和孔径在2-17 nm范围内的扩孔MCM-41）的特性和CO2吸附在这个研究中。吸附数据表明，具有适当孔径的胺容纳的SBA-15在333 K时表现出最佳的CO2吸附能力，为2.41 mmol CO2 / g。用CO2 / N摩尔比表示的相应CO2吸附效率高达0.5-0.7，表明吸附足够接近热力学平衡。提出了胺官能化介孔二氧化硅的CO 2吸附机理。可以认为接枝胺在无水CO2下的吸附是通过氨基甲酸酯中间体和两性离子机理进行的。

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