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Recent advances in the use of ionic liquids in the CO2 conversion to CO and C2+ hydrocarbons

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Abstract

Addressing industrial carbon dioxide (CO2) emissions is imperative due to its contribution to global warming. Transitioning toward more sustainable processes, CO2 conversion technologies hold promise in generating high-value chemicals. Notably, ionic liquids (ILs) have been reported to significantly boost CO2 conversion to CO and facilitate the production of C2+ hydrocarbons within a single reactor. This study delves into the recent advancements in employing ILs for converting CO2 into CO or into C2+ hydrocarbons. Performance metrics of various catalysts, both with and without ILs, involved in the reverse water–gas shift (RWGS) reaction, are presented. Detailed insights into the underlying reaction mechanisms and thermodynamics are shared. Further, the study elaborates on the experimental procedures adopted for synthesizing IL + metal catalysts, optimally suitable for producing CO or C2+ hydrocarbons. Additionally, we report the latest accomplishments in IL-based electrochemical CO2 reduction to CO. Despite the limited availability of studies, the use of IL + metal catalysts for CO2 reduction to CO or C2+ has shown considerable promise. These advancements predominantly involve lowering the operational temperature of the reactor and enabling the production of C2+ hydrocarbons in a single unit. However, this technology is still incipient. There are crucial areas that demand further exploration, such as understanding system kinetics, thermodynamics, and enhancing process modeling and simulation. As such, this study provides a comprehensive understanding of the potential and challenges of IL-enhanced CO2 conversion, propelling future research in this field.

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Fig. 1

(Adapted from the literature (Yasuda et al. 2018, reproduced with permission of Elsevier at License Number 5471880304059)

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Data sharing not applicable to this article as no datasets were generated or analysed during the current study

Abbreviations

[HMIm][F4B]:

1-Hexyl-3-methylimidazolium tetrafluoroborate

[HMIm][HySp]:

1-Hexyl-3-methylimidazolium hydrogensulfate

[HySp]:

Hydrogensulfate

[F4B]:

Tetrafluoroborate

[F3Ac]:

Trifluoroacetate

[AMIm][(F3MeSu)2A]:

1-Alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amides

[BMIm][NTf2]:

1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide

[BMIm][( F3MeS)2A)]:

1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide

[BMIm][Ac]:

1-Butyl-3-methylimidazolium acetate

[BMIm][C]:

1-n-Butyl-3-methylimidazolium-2-carboxylate

[BMIm][Cl]:

1-Butyl-3-methylimidazolium chloride

[BMIm][Cl]*:

1-Butyl-3-methylimidazolium chloride

[BMIm][F3(F5E)3P]:

1-Butyl-2,3-dimethylimidazolium trifluorotris(pentafluoroethyl) phosphate

[BMIm][F4B]:

1-Butyl-3-methylimidazolium tetrafluoroborate

[BMIm][F6P]:

1-Butyl-3-methylimidazolium hexafluorophosphate

[BMIm][MSu]:

1-Butyl-3-methylimidazolium methylsulfonate

[BMMIm][Cl]:

1-Butyl-2,3-dimethylimidazolium chloride

[BMMIm][Cl]*:

3-Butyl-1,2-dimethylimidazolium chloride

[BMMIm][F3MeSu]:

1-Butyl-2,3-dimethylimidazolium trifluoromethanesulfonate

[DEA][Bu]:

Diethylammonium butanoate

[EMIm][F4B]:

1-Ethyl-3-methylimidazolium tetrafluoroborate

[EMIm][F3MeSu]:

1-Ethyl-3-methylimidazolium trifluoromethanesulfonate

[EMMIm][Ni]:

1-Ethyl-2,3-dimethylimidazolium nitrite

[EMMIm][Ni]:

1-Ethyl-2,3-dimethylimidazolium nitrite

[HMIm][F4B]:

1-Hexyl-3-methylimidazolium tetrafluoroborate

[Ru(CO)3Cl2]2 :

Tricarbonyldichlororuthenium(II) dimer

[Xantphos]:

4,5-Bis(diphenylphosphine)-9,9-dimethylxanthene

AC:

Activated carbon

FTS:

Fisher–Tropsch synthesis

HCPs:

Hypercrosslinked polymers

HCs:

Hydrocarbons

HIPs:

Hypercrosslinked ionic polymers

IL:

Ionic liquids

ILSS:

Ionic liquid-supported synthesis

Im:

Imidazolium

M-NPs:

Metal nanoparticles

RWGS:

Reverse water–gas shift

SILP:

Supported ionic liquid phase

TOF:

Turnover frequency

TRL:

Technology readiness level

WGS:

Water–gas shift

RTIL:

Room temperature ionic liquid

FE:

Faradaic efficiency

HKUST:

Hong Kong university

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Acknowledgements

The authors gratefully acknowledge REPSOL Sinopec Brasil for its financial and technical support and ANP (Brazilian National Agency for Petroleum, Natural Gas and Biofuels) for the strategic importance of its support through the R&D levy regulation. The authors also acknowledge the São Paulo Research Foundation (FAPESP) (#2021/07155-6) and the National Council for Scientific and Technological Development—CNPQ (#314598/2021-9). This study was financed in part by the Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil—Finance Code 001.

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MFS contributed to methodology, formal analysis, literature review, investigation, and writing; MLA helped in formal analysis, investigation, literature review, and writing; CAON contributed to supervision and conceptualization; GSB helped in review and resources; R.MBA contributed to conceptualization, resources, supervision, writing, and review.

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Correspondence to Rita Maria B. Alves.

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Santos, M.F., Alcantara, M.L., Nascimento, C.A.O. et al. Recent advances in the use of ionic liquids in the CO2 conversion to CO and C2+ hydrocarbons. Clean Techn Environ Policy 26, 11–29 (2024). https://doi.org/10.1007/s10098-023-02583-3

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