title: 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.
authors.affiliation: Institute of Industrial Ecology and Environment, Department of Chemical and Biological Engineering, Zhejiang University, Yuquan Campus, Hangzhou 310027, PR China.
authors.forename: Yamin
authors.initials: Y
authors.lastname: Liu
authors.forename: Qing
authors.initials: Q
authors.lastname: Ye
authors.forename: Mei
authors.initials: M
authors.lastname: Shen
authors.forename: Jingjin
authors.initials: J
authors.lastname: Shi
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Pan
authors.forename: Yao
authors.initials: Y
authors.lastname: Shi
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D005029:Ethylenediamines; D057232:Global Warming / Q000517:prevention & control*; D008956:Models, Chemical; D017640:Silicates / Q000737:chemistry*; D013696:Temperature
chemical_list: D000588:Amines; D005029:Ethylenediamines; D017640:Silicates; D002245:Carbon Dioxide; C034269:tetraethylenepentamine