文献类型：期刊文献

英文题名：Understanding on the structure of novel hydroxypyridine anion-based ionic liquids and their effect on CO2 absorption behavior

作者：Zhu, Xiao[1];Liu, Shuhui[1];Shang, Ruhui[1];Chen, Xin[2];Xu, Yingjie[3];Guo, Yujun[3];Ling, Baoping[1]

机构：[1]Qufu Normal Univ, Sch Chem & Chem Engn, Key Lab Catalyt Convers & Clean Energy Univ Shando, Qufu, Peoples R China;[2]Henan Univ, Coll Chem & Chem Engn, Kaifeng 475001, Peoples R China;[3]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2024

卷号：12

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001274584000001)、、EI(收录号：20243016736137)、Scopus(收录号：2-s2.0-85198946987)、WOS

基金：Sincere thanks are given to National Natural Science Foundation of China (No. 21206085, 21978172) , and the Natural Science Foundation of Shandong Province (No. ZR2020MB112, ZR2021MB054) for financial support.

语种：英文

外文关键词：Ionic liquids; CO 2 absorption; Density; Viscosity; Speed of sound; Mechanism

外文摘要：Three novel anion-functionalized proton ionic liquids (ILs) were prepared from superbase 1,5-diazabicyclic [4.3.0]non-5-nonene (DBN) and 2-hydroxypyridine (2-OP), 3-hydroxypyridine (3-OP) and 4-hydroxypyridine (4-OP). Then application of ILs in the CO2 absorption have been investigated and the effects of temperature, pressure and humidity on the absorption properties of ILs were also studied. Experimental results demonstrated that such ionic liquids can exhibit outstanding reversibility and high CO2 capacity at room temperature. In order to reveal the influence of position of substituents in anion on the absorption behavior, the physicochemical properties including density (rho), viscosity(eta), and speed of sound (u) were measured at T = 298.15-328.15 K, which were used to calculate the molecular volume (Vm), standard entropy (S0), lattice energy (UPOT), isentropic compressibility coefficient (kappa s) and thermal expansion coefficient (alpha p) of the pure ionic liquids at different temperatures. The results showed that [DBNH][2-OP] with O atom located in the ortho position of N atom appeared lower viscosity and larger free volumes as well as stronger alkalinity, which can endow it excellent CO2 capture capacity of about 1.4 mol CO2/mol IL (about 0.3 g CO2/g IL) at 30 degrees C. Based on quantum chemical calculation and 13C NMR as well as FT-IR spectra, the chemical absorption mechanisms of the two active sites was proposed. These results provide important insights into effective strategies for CO2 capture.