Transition metal-catalyzed hydrogenation of carbon dioxide in ionic liquids

Qadir, Muhammad Irfan; Webber, Rodrigo; Dupont, Jaı̈rton

doi:10.1016/bs.adomc.2019.02.005

Cited by 5 publications

(2 citation statements)

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“…The homogeneous precious platinum‐group metals (e.g., Rh, Ru, and Ir) associated with relatively sophisticated ligands are highly active, but these systems typically involve stoichiometric amounts of an amine or another strong base as a co‐reagent or buffer solution . However, examples of heterogeneous‐based catalysts are relatively rare and give only very low CO 2 conversions . In fact, there is a plethora of both homogeneous and heterogeneous catalysts that can perform this reduction under different conditions with high conversions, but they generally lead to formiate (HCO 2 − ) .…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] However, examples of heterogeneous-based catalysts are relativelyr are and give only very low CO 2 conversions. [12,13] In fact, there is ap lethora of both homogeneous and heterogeneous catalysts that can perform this reduction under different conditions with high conversions, but they generally lead to formiate (HCO 2 À ). [11,[14][15][16] One of the major drawbacks of this approachi st he need for hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Semi‐Water–Gas Shift Reaction: A Simple Green Path to Formic Acid Fuel

et al. 2020

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Formic acid (FA) is a promising CO and hydrogen energy carrier, and currently its generation is mainly centered on the hydrogenation of CO2. However, it can also be obtained by the hydrothermal conversion of CO with H2O at very high pressures (>100 bar) and temperatures (>200 °C), which requires days to complete. Herein, it is demonstrated that by using a nano‐Ru/Fe alloy embedded in an ionic liquid (IL)‐hybrid silica in the presence of the appropriate IL in water, CO can be catalytically converted into free FA (0.73 m) under very mild reactions conditions (10 bar at 80 °C) with a turnover number of up to 1269. The catalyst was prepared by simple reduction/decomposition of Ru and Fe complexes in the IL, and it was then embedded into an IL‐hybrid silica {1‐n‐butyl‐3‐(3‐trimethoxysilylpropyl)‐imidazolium cations associated with hydrophilic (acetate, SILP‐OAc) and hydrophobic [bis((trifluoromethyl)sulfonyl)amide, SILP‐NTf2] anions}. The location of the alloy nanoparticles on the support is strongly related to the nature of the anion, that is, in the case of hydrophilic SILP‐OAc, RuFe nanoparticles are more exposed to the support surface than in the case of the hydrophobic SILP‐NTf2, as determined by Rutherford backscattering spectrometry. This catalytic membrane in the presence of H2O/CO and an appropriate IL, namely, 1,2‐dimethyl‐3‐n‐butylimidazolium 2‐methyl imidazolate (BMMIm⋅MeIm), is stable and recyclable for at least five runs, yielding a total of 4.34 m of free FA.

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Section: Introductionmentioning

confidence: 99%