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Solvent‐ and Catalyst‐Free Carbon Dioxide Capture and Reduction to Formate with Borohydride Ionic Liquid
Author(s) -
Lombardo Loris,
Yang Heena,
Zhao Kun,
Dyson Paul J.,
Züttel Andreas
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201903514
Subject(s) - ionic liquid , chemistry , formic acid , borohydride , formate , inorganic chemistry , catalysis , solvent , chloride , organic chemistry
The metal‐ and solvent‐free capture and reduction of large amounts of CO 2 to formate under ambient conditions is achieved by combining a pyrrolidinium‐based ionic liquid with a borohydride anion. This material demonstrates one of the highest CO 2 capacities at room temperature and 1 bar with up to 1 gCO2 g −1 IL . CO 2 gas reacts with the BH 4 − anion to give triformatoborohydride, [HB(OCHO) 3 ] − . The reaction occurs without loss in capacity at low CO 2 concentration (6 vol % diluted with N 2 ). The thermodynamics and kinetics of the reaction were monitored by using a magnetic suspended balance. In addition, more than 1 molCO2 mol −1[ EMPY ] [ BH4 ]is captured and reduced if air is used as a CO 2 source. The product can be then treated with HCl to give formic acid and the corresponding ionic liquid chloride, which can be recycled. This ionic liquid borohydride demonstrates great potential as a CO 2 absorber and reducer to produce alternative fuels.