文献类型：期刊文献

英文题名：NOx absorption and conversion by ionic liquids

作者：Liu, Jiajia[1];Xu, Yingjie[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2021

卷号：409

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000621669800005)、、WOS

基金：This work was supported by the National Science Foundation of China (No. 21978172), National Natural Science Foundation of Zhejiang Province (No. Y18B060014).

语种：英文

外文关键词：Ionic liquids (ILs); NOx; Absorption; Conversion

外文摘要：Ionic liquids (ILs) can be used as absorbents and catalysts for NOx absorption and conversion due to their low toxicity, low energy consumption and excellent reusability. The capacity and absorption mechanism of NOx absorption by ILs are presented in this paper. Generally, NO(x )are physically absorbed by conventional ILs such as imidazolium-based ILs. The absorption capacity is as follows: NO2>NO>N2O, which is in good agreement with the binding energy between NOx and ILs. Furthermore, low temperature, high pressure and large cation volume are favorable for NOx absorption. The strategies of enhancing NOx capacity through functionalized ILs with metal-containing anions (e.g. [FeCl4](2-)), amine groups, sulfonate and carboxylate anions are also concluded. Active N or O sites in functionalized ILs can react with the dimer of NO (N2O2), resulting in high capacity. Moreover, introducing electron-withdrawing substituents such as chlorine and bromine into carboxylate or sulfonate anions reduces desorption residue. Besides NOx absorption, ILs with [NO3](-) can activate NO and efficiently catalyze its conversion into HNO3 in the presence of O-2 and H2O, and have better performance than ILs with [Cl](-), Vier and [CF3SO3](-,) which is attributed to the strong oxidization capability of [NO3](-). In addition, low temperature and high O-2 content can further improve NO conversion.