1,3-Dimethylurea Tetrabutylphosphonium Bromide Ionic Liquids for NO Efficient and Reversible Capture

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• 作者：Bin Jiang ; Weiren Lin ; Luhong Zhang ; Yongli Sun ; Huawei Yang ; Li Hao ; Xiaowei Tantai
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：January 21, 2016
• 年：2016
• 卷：30
• 期：1
• 页码：735-739
• 全文大小：285K
• ISSN：1520-5029

文摘

To explore environmentally friendly and benign solvents to capture NO gas, a series of ionic liquids was newly synthesized by 1,3-dimethylurea and tetrabutylphosphonium bromide with different mole ratios (1:1, 2:1, and 3:1). In addition, their NO absorption and desorption properties were studied at a temperature from 30 to 70 °C and atmospheric pressure for the first time. These synthesized ionic liquids exhibited excellent reversibility and high NO solubility, such as 1.173 mol of absorbed NO/mol of ionic liquids (3:1) at 40 °C and 101.3 kPa. The solubility of NO in these synthesized ionic liquids increased with the increase of the mole ratios of 1,3-dimethylurea in ionic liquids and also with the decrease of the temperature. The studies of Fourier transform infrared spectroscopy (FTIR) and ¹H and ¹³C nuclear magnetic resonance (NMR) spectra revealed that it is a reversible chemical process for these ionic liquids to capture NO gas; therefore, we proposed a reversible chemical absorption mechanism. These reversible and benign ionic liquids potentially offer a new opportunity to absorb NO gas.