Absorption and oxidation of nitrogen oxide in ionic liquids

Andreas Jonas Kunov-Kruse; Peter Langelund Thomassen; Anders Riisager; Susanne Mossin; Rasmus Fehrmann

doi:10.1002/chem.201601166

Absorption and oxidation of nitrogen oxide in ionic liquids

Andreas Jonas Kunov-Kruse, Peter Langelund Thomassen, Anders Riisager, Susanne Mossin, Rasmus Fehrmann

Department of Chemistry

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Abstract

A new strategy for capturing nitrogen oxide, NO, from the gas phase is presented. Dilute NO gas is removed from the gas phase by ionic liquids under ambient conditions. The nitrate anion of the ionic liquid catalyzes the oxidation of NO to nitric acid by atmospheric oxygen in the presence of water. The nitric acid is absorbed in the ionic liquid up to approximately one mole HNO3 per mole of the ionic liquid due to the formation of hydrogen bonds. The nitric acid can be desorbed by heating, thereby regenerating the ionic liquid with excellent reproducibility. Here, time-resolved in-situ spectroscopic investigations of the reaction and products are presented. The procedure reveals a new vision for removing the pollutant NO by absorption into a non-volatile liquid and converting it into a useful bulk chemical, that is, HNO₃.

Original language	English
Journal	Chemistry - A European Journal
Volume	22
Issue number	33
Pages (from-to)	11745-11755
Number of pages	11
ISSN	0947-6539
DOIs	https://doi.org/10.1002/chem.201601166
Publication status	Published - 2016

Keywords

Gas absorption
Ionic liquids
IR spectroscopy
Nitric acid
NOx

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Fehrmann June2016Accepted author manuscript, 630 KB

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title = "Absorption and oxidation of nitrogen oxide in ionic liquids",

abstract = "A new strategy for capturing nitrogen oxide, NO, from the gas phase is presented. Dilute NO gas is removed from the gas phase by ionic liquids under ambient conditions. The nitrate anion of the ionic liquid catalyzes the oxidation of NO to nitric acid by atmospheric oxygen in the presence of water. The nitric acid is absorbed in the ionic liquid up to approximately one mole HNO3 per mole of the ionic liquid due to the formation of hydrogen bonds. The nitric acid can be desorbed by heating, thereby regenerating the ionic liquid with excellent reproducibility. Here, time-resolved in-situ spectroscopic investigations of the reaction and products are presented. The procedure reveals a new vision for removing the pollutant NO by absorption into a non-volatile liquid and converting it into a useful bulk chemical, that is, HNO3.",

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AU - Kunov-Kruse, Andreas Jonas

AU - Thomassen, Peter Langelund

AU - Riisager, Anders

AU - Mossin, Susanne

AU - Fehrmann, Rasmus

PY - 2016

Y1 - 2016

N2 - A new strategy for capturing nitrogen oxide, NO, from the gas phase is presented. Dilute NO gas is removed from the gas phase by ionic liquids under ambient conditions. The nitrate anion of the ionic liquid catalyzes the oxidation of NO to nitric acid by atmospheric oxygen in the presence of water. The nitric acid is absorbed in the ionic liquid up to approximately one mole HNO3 per mole of the ionic liquid due to the formation of hydrogen bonds. The nitric acid can be desorbed by heating, thereby regenerating the ionic liquid with excellent reproducibility. Here, time-resolved in-situ spectroscopic investigations of the reaction and products are presented. The procedure reveals a new vision for removing the pollutant NO by absorption into a non-volatile liquid and converting it into a useful bulk chemical, that is, HNO3.

AB - A new strategy for capturing nitrogen oxide, NO, from the gas phase is presented. Dilute NO gas is removed from the gas phase by ionic liquids under ambient conditions. The nitrate anion of the ionic liquid catalyzes the oxidation of NO to nitric acid by atmospheric oxygen in the presence of water. The nitric acid is absorbed in the ionic liquid up to approximately one mole HNO3 per mole of the ionic liquid due to the formation of hydrogen bonds. The nitric acid can be desorbed by heating, thereby regenerating the ionic liquid with excellent reproducibility. Here, time-resolved in-situ spectroscopic investigations of the reaction and products are presented. The procedure reveals a new vision for removing the pollutant NO by absorption into a non-volatile liquid and converting it into a useful bulk chemical, that is, HNO3.

KW - Gas absorption

KW - Ionic liquids

KW - IR spectroscopy

KW - Nitric acid

KW - NOx

U2 - 10.1002/chem.201601166

DO - 10.1002/chem.201601166

M3 - Journal article

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JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

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Absorption and oxidation of nitrogen oxide in ionic liquids

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