Carbon Dioxide Capture by Functionalized Solid Amine Sorbents with Simulated Flue Gas Conditions

Abstract

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.

Vapor-enhanced CO2 adsorption mechanism of composite PEI@ZIF-8 modified by polyethyleneimine for CO2/N2 separation

“…One appeared at 479 K indicative of PEI desorption from 45PEI@ZIF-8, and the other two peaks appeared separately at about 770 and 820 K, indicating the decomposition of ZIF-8. The TG and DTG analyses above suggested that the PEI@ZIF-8 is thermally stable until 450 K, and it has more superior stability than many other PEI modified materials, such as PEI@KIT-6 [34] and PEI@HP-20 [35], which made it a robust adsorbent for industrial applications below 450 K. Fig. 4 presents the XRD patterns of ZIF-8 and PEI@ZIF-8 with different PEI loading, which were essentially identical.…”

Kinetics Studies of CO2 Adsorption/Desorption on Amine-Functionalized Multiwalled Carbon Nanotubes

“…Detailed protocols of the preparation were described in our previous study. 7 The experiment for CO 2 adsorption was carried out following a procedure reported by Liu et al 9 Adsorbents were treated under a nitrogen flow at 423 K for 90 min and then cooled to the test temperature. The flow was then switched to a desired simulated flue gas.…”

Stability of amine-based hollow fiber CO2 adsorbents in the presence of NO and SO2

“…Post combustion CO 2 capture, as a CO 2 reduction technology that could be retrofitted onto existing large CO 2 emission sources such as coal and gas-fired power plants, has been the focus of intense research in recent years [4][5][6]. In this regard, environmentally benign, efficient adsorption technologies with low parasitic power plant loads are desired as substitutes for the conventional amine solvent absorption processes traditionally considered for CO 2 Solid adsorbents have been extensively investigated as possible alternatives to amine solvents for CO 2 capture [3,4,[7][8][9][10]. Amine species supported on various solids such as silica are examples of chemisorbents that have high adsorption capacities and desirable selectivity toward CO 2 over N 2 .…”