A novel solid amine sorbent was prepared using KIT-6-type mesoporous silica modified with tetraethylenepentamine (TEPA). Its adsorption behavior toward CO(2) from simulated flue gases is investigated using an adsorption column. The adsorption capacities at temperatures of 303, 313, 333, 343, and 353 K are 2.10, 2.29, 2.58, 2.85, and 2.71 mmol g(-1), respectively. Experimental adsorption isotherms were obtained, and the average isosteric heat of adsorption was 43.8 kJ/mol. The adsorption capacity increases to 3.2 mmol g(-1) when the relative humidity (RH) of the simulated flue gas reaches 37%. The adsorption capacity is inhibited slightly by the presence of SO(2) at concentrations lower than 300 ppm but is not significantly influenced by NO at concentrations up to 400 ppm. The adsorbent is completely regenerated in 10 min at 393 K and a pressure of 5 KPa, with expected consumption energy of about 1.41 MJ kg(-1) CO(2). The adsorption capacity remains almost the same after 10 cycles of adsorption/regeneration with adsorption conditions of 10 vol % CO(2), 100 ppm SO(2), 200 ppm NO, 100% relative humidity, and a temperature of 393 K. The solid amine sorbent, KIT-6(TEPA), performs excellently for CO(2) capture and its separation from flue gas.

No abstract

No abstract

No abstract

： NovelCO 2 adsorbentsforCO 2 removalwerepreparedbyintroducingtetraethylenepentamine(TEPA) intoSBA鄄16typemesoporoussilicausingapost鄄syntheticimpregnationmethod.Thepropertiesofthemesoporous materialsbeforeandaftersurfacemodificationwerecharacterizedbyX鄄 raydiffraction(XRD),transmissionelectron microscopy(TEM),thermalgravimetricanalysis(TGA),andN 2 adsorption鄄desorption.WeconfirmedthatTEPAwas loadedontothesurfaceofthechannelsinthemesoporousmaterials.Thesurfacearea,poresize,andporevolumeof TEPA鄄loadedSBA鄄16decreasedwithanincreaseinTEPAloadingwhileitsfundamentalporestructurewas unchanged.ThedynamicadsorptionofCO 2 ontoTEPA鄄loadedSBA鄄16aswellasitsregenerationpropertywas studiedinapackedcolumn.Thetotaladsorptioncapacityandbreakthroughcapacityincreasedwhentheamountof loadedTEPAincreasedfrom10%to30%(w).Thesampleimpregnatedwith30%TEPAshowedthehighest breakthroughcapacityandtotaladsorptioncapacityofabout0.625and0.973mmol •g-1 at60 益,respectively.From60 益 to80 益,theCO 2 dynamicadsorptionbehaviorofTEPA鄄loadedSBA鄄16wasstable.Thetotaladsorptioncapacityof CO 2 onTEPA鄄loadedSBA鄄16droppedslightly(6.45%)after20adsorption鄄desorptionregenerationcycles.Their CO 2 adsorptionbehaviorwasalsoinvestigatedusingthedeactivationmodel,whichshowedanexcellentpredictive capabilityforthebreakthroughcurves.