有机胺修饰具有较大孔径介孔材料的二氧化碳吸附性能

doi:10.3866/PKU.WHXB201202071

Abstract

Abstract: Mesoporous silica SBA-15-like materials with large pores were synthesized using tri-block copolymer P123 as a structure-directing agent, tetramethoxysilane as the silicon source, and different organic solvents as swelling agents. The resulting materials were characterized by powder X-ray diffraction (XRD), N₂ adsorption-desorption, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The results showed that the introduction of swelling agents effectively enlarged the pore diameter and pore volume of the SBA-15 materials, and pore swelling with isooctane was larger than that with CCl4. When modified with tetraethylenepentamine (TEPA), all of these composite materials exhibited excellent adsorption capacities for CO₂. The adsorption capacity of CO₂ was independent of the pore structure, if the template was removed before modification with TEPA. By contrast, the adsorption capacity increased with the pore diameter when the as-synthesized mesoporous material was modified with TEPA. The effects of temperature and pressure on the CO₂ adsorption capacity were investigated using adsorption isotherms and CO₂ temperature-programmed desorption (TPD). With CO₂ adsorption at higher temperature, the composite materials showed different adsorption capacities with pressure variation. As a result, the adsorption and separation of CO₂ on these TEPA modified mesoporous materials in ambient air flow can be realized via pressure swing adsorption.

Key words: Swelling agent, Mesoporous materials, CO₂, Pressure swing adsorption, Template, Tetraethylenepentamine

MSC2000:

O647

ZHAO Hui-Min, LIN Dan, YANG Gang, CHUN Yuan, XU Qin-Hua. Adsorption Capacity of Carbon Dioxide on Amine Modified Mesoporous Materials with Larger Pore Sizes[J].Acta Phys. -Chim. Sin., 2012, 28(04): 985-992.

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Adsorption Capacity of Carbon Dioxide on Amine Modified Mesoporous Materials with Larger Pore Sizes

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