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基于溴化铵的低共熔溶剂对烟气中SO和NO的有效吸收机制

Effective Absorption Mechanism of SO and NO in the Flue Gas by Ammonium-Bromide-Based Deep Eutectic Solvents.

作者信息

Zhou Tengteng, Zhao Yongqi, Xiao Xinxin, Liu Yixuan, Bai Hongcun, Chen Xingxing, Dou Jinxiao, Yu Jianglong

机构信息

Key Laboratory of Advanced Coal and Coking Technology of Liaoning Province, School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.

State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ning Xia University, Yinchuan 750021, China.

出版信息

ACS Omega. 2022 Aug 9;7(33):29171-29180. doi: 10.1021/acsomega.2c03221. eCollection 2022 Aug 23.

DOI:10.1021/acsomega.2c03221
PMID:36033684
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9404461/
Abstract

Simultaneous capture of SO and NO from flue gas is critical for coal-fired power generation. In this study, environmentally friendly and high-performance deep eutectic solvents based on ethylene glycol and ammonium bromide were designed to capture SO and NO simultaneously. The SO and NO absorption performances and absorption mechanisms were systematically investigated by H NMR and Fourier transform infrared (FT-IR) spectroscopy in combination with ab initio calculations using Gaussian software. The results showed that EG-TBAB DESs can absorb low concentrations of SO and NO from the flue gas simultaneously at low temperatures (≤50 °C). H NMR, FT-IR, and simulation results indicate that SO and NO are absorbed by forming EG-TBAB-SO-NO complexes, Br is the main active site for NO absorption, and NO is more active in an EG-TBAB-NO-SO complex than SO. EG-TBAB DESs exhibit outstanding regeneration capability, and absorption capacities remain unchanged after five absorption-desorption cycles. The fundamental understanding of simultaneous capture of SO and NO from this study enables DES structures to be rationally designed for efficient and low-cost desulfurization and denitrification reagents.

摘要

同时从烟气中捕集二氧化硫（SO）和氮氧化物（NO）对于燃煤发电至关重要。在本研究中，设计了基于乙二醇和溴化铵的环境友好型高性能低共熔溶剂，用于同时捕集SO和NO。通过核磁共振氢谱（H NMR）和傅里叶变换红外（FT-IR）光谱，并结合使用高斯软件进行的从头算计算，系统地研究了SO和NO的吸收性能及吸收机理。结果表明，乙二醇-四丁基溴化铵低共熔溶剂（EG-TBAB DESs）能够在低温（≤50°C）下同时从烟气中吸收低浓度的SO和NO。H NMR、FT-IR及模拟结果表明，SO和NO通过形成EG-TBAB-SO-NO配合物被吸收，溴（Br）是NO吸收的主要活性位点，且在EG-TBAB-NO-SO配合物中NO比SO更具活性。EG-TBAB DESs表现出出色的再生能力，经过五次吸收-解吸循环后吸收容量保持不变。本研究对同时捕集SO和NO的基本认识有助于合理设计低共熔溶剂的结构，以获得高效且低成本的脱硫脱硝试剂。

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