文献类型：期刊文献

英文题名：An absorption mechanism and polarity-induced viscosity model for CO2 capture using hydroxypyridine-based ionic liquids

作者：An, Xiaowei[1];Du, Xiao[1];Duan, Donghong[1];Shi, Lijuan[1];Hao, Xiaogang[1];Lu, Houfang[2];Guan, Guoqing[3];Peng, Changjun[4,5]

机构：[1]Taiyuan Univ Technol, Dept Chem Engn, Taiyuan 030024, Peoples R China;[2]Sichuan Univ, Coll Chem Engn, Chengdu 610065, Peoples R China;[3]Hirosaki Univ, NJRISE, 2-1-3 Matsubara, Aomori 0300813, Japan;[4]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2017

卷号：19

期号：2

起止页码：1134

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000392399400021)】；

基金：This work was supported by the Coal Based Key Project of Shanxi Province (MD2014-09) and the National Basic Research Program of China (2015CB251401).

语种：英文

摘要：A series of new hydroxypyridine-based ionic liquids (ILs) are synthesized and applied in CO2 capture through chemical absorption, in which one IL, i.e., tetrabutylphosphonium 2-hydroxypyridine ([P-4444][2-Op]), shows a viscosity as low as 193 cP with an absorption capacity as high as 1.20 mol CO2 per mol IL. Because the traditional anion-CO2 absorption mechanism cannot provide an explanation for the influences of cations and temperature on CO2 absorption capacity, herein, a novel cation-participating absorption mechanism based on the proton transfer is proposed to explain the high absorption capacity and the existence of a turning point of absorption capacity with the increase of temperature for the capture of CO2 using [P-4444][n-Op] (n = 2, 3, 4) ILs. Also, the relationship between the viscosity of ILs and the linear interaction energy is proposed for the first time, which can guide how to design and synthesize ILs with low viscosity. Quantum chemistry calculations, which are based on the comprehensive analysis of dipole moment, cation-anion interaction energy and surface electrostatic potential, indicate that the different viscosities of hydroxypyridine-based ILs and the changes after CO2 absorption mainly resulted from the different distribution of negative charges in the anion.