Amine-raws li Adsorbents

Qee cov khoom siv organic lossis polymers uas muaj ammonium ions tuaj yeem sib xyaw nrog cov kua qaub CO2 molecules ntawm qhov kub thiab txias thiab tuaj yeem siv rau CO2 adsorption capture. Lawv muaj qhov zoo ntawm qhov muaj peev xwm siab ntawm qhov qis CO2 ib feem ntawm qhov siab (10%-15%), qhov kub thiab txias (<100 °C) and less equipment corrosion. The adsorption characteristics of amine-based adsorbents are related to factors such as amine loading, amine type, amine site density, amine molecular size on the solid support, and CO2 partial pressure. Since the adsorption performance of rich amine adsorbents is mainly based on chemical adsorption, their poor thermal regeneration ability remains a major disadvantage. A combined strategy was used to develop an ultra-stable amine-containing solid adsorbent that only lost 8.5% of its adsorption capacity even after aging for 30 days in O2-containing flue gas at 110 °C.

Polyethyleneimine (PEI) tau impregnated rau hauv ntxeem tau SiO2 los npaj ib qho amine-muaj adsorbent. PEI nyob rau sab nrauv ntawm cov adsorbent tau xaiv alkylated nrog epoxide los ua ke cov amine-raws li CO2 adsorbent nrog siab SO2 tsis kam. Lub peev xwm adsorption ntawm CO2 nyob rau hauv simulated flue gas tej yam kev mob (60 degree, 15% CO2, 10% H2O, 2% Ar, thiab tshuav roj N2) mus txog 139.48 mg / g. Nyob rau hauv cov xwm txheej ntawm 50 ppm SO2 concentration, lub peev xwm adsorption tsuas poob 8.52% tom qab 1000 cycles, qhia kev ruaj ntseg zoo. HBS tau grafted nrog amines nyob rau hauv anhydrous thiab aqueous tej yam kev mob. Nyob rau hauv qhuav tej yam kev mob ntawm 25 degree, siv ambient cua uas muaj 415 ppm CO2, dynamic adsorption muaj peev xwm mus txog 1.04 mmol / g. Kev ua haujlwm ntawm amine-raws li adsorbents cuam tshuam los ntawm hom, thauj khoom, thiab qhov hnyav molecular ntawm amine. Li et al. impregnated PEI rau hauv nano-SiO2 los tsim PEI-SiO2 adsorbent nrog siab thermal stability.

Txoj kev tshawb nrhiav pom tias cov ceg ntoo PEI muaj peev xwm adsorption ntau dua ntawm 202 mg / g dua li linear PEI. Cov teebmeem ntawm kev thauj khoom thiab qhov hnyav molecular tau kawm. Ntau dhau los yog tsawg dhau amine loading tsis haum rau qhov nce ntawm adsorption muaj peev xwm. PEI-SiO2 adsorbents nrog qis PEI loading thiab molecular hnyav pom zoo adsorption kinetics. Cov qauv thiab muaj pes tsawg leeg ntawm cov khoom nqa khoom kuj tseem cuam tshuam rau cov txheej txheem adsorption. Ntau cov kev tshawb fawb tau tsom mus rau kev txhim kho cov adsorption kev ua tau zoo ntawm amine-based adsorbents los ntawm kev hloov SiO2. Lub CO2 adsorption tus nqi tau txhim kho los ntawm kev hloov cov qauv, thiab mesoporous SiO2 nanospheres nrog ib qho inverted cone pore qauv tau ua ke. Lub peev xwm adsorption ntawm cov khoom tau nce los ntawm 50%, thiab lub zog adsorption thiab desorption kuj raug txo. Qhov no txhais tau tias cov adsorbent muaj cov qauv zoo dua qub. Qhov loj qhov pores yog qhov zoo dua rau kev nkag thiab tawm ntawm cov roj molecules, thiab cov pore loj ntim muab ntau qhov chaw rau diffusion.

Siv cov qauv ib leeg thiab ob chav qauv txoj kev los ua ke bimodal thiab trimodal SiO2 ua cov khoom thauj, lub peev xwm adsorption ntawm bimodal SiO2 tuaj yeem ncav cuag 350 mg / g, thaum lub peev xwm adsorption ntawm trimodal SiO2 tuaj yeem ncav cuag 215 mg / g. Li et al. siv hlau nitrates los hloov amorphous nano-SiO2. Txoj kev tshawb nrhiav pom tias cov khoom amine adsorbent hloov kho los ntawm Al, Zn, thiab Mg muaj kev ruaj ntseg zoo dua. Tom qab 50 lub voj voog adsorption, tsuas yog 2.6% mus rau 28.8% ntawm thawj CO2 adsorption peev tau ploj, thaum cov khoom qub amine adsorbent poob 42.9%.