Integrated carbon capture and utilization based on bifunctional ionic liquids to save energy and emissions

Hernández, Ernesto Sánchez; Hospital-Benito, Daniel; Moya, Cristian; Ortiz, R.; Belinchón, Alejandro; Paramio, C.; Lemus, Jesús; Navarro, Pablo; Palomar, José

doi:10.1016/j.cej.2022.137166

Cited by 25 publications

(21 citation statements)

References 38 publications

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“…Ionic liquids (ILs) are a new category of green solvents with low volatility, high thermal stability, excellent designability, and stable physicochemical properties, 12–14 showing great strengths in various areas, such as the removal of SO 2 , 15,16 CO 2 , 17 SF 6 , 18 and methyl mercaptan 19 . In recent years, protic ILs (PILs) have also made a great progress for capturing of H 2 S. For example, the imidazole‐functionalized [DBNH][1,2,4‐triaz] synthesized by Wu et al 20 provided an H 2 S uptake of 1.2 mol mol −1 at 303.2 K and 1.0 bar.…”

Section: Introductionmentioning

confidence: 99%

“…11 Therefore, reducing the energy consumption required for regeneration of the absorbent is a necessary prerequisite for great breakthrough in H 2 S separation technology. Ionic liquids (ILs) are a new category of green solvents with low volatility, high thermal stability, excellent designability, and stable physicochemical properties, [12][13][14] showing great strengths in various areas, such as the removal of SO 2 , 15,16 CO 2 , 17 SF 6 , 18 and methyl mercaptan. 19 In recent years, protic ILs (PILs) have also made a great progress for capturing of H 2 S. For example, the imidazole-functionalized…”

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confidence: 99%

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Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

et al. 2022

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We demonstrate an effective strategy for capture and conversion of H 2 S in novel superbase protic ionic liquids (SPILs). It is found that the synthesized SPILs with the multiple active sites exhibit the unprecedented H 2 S uptake via chemical absorption (up to 1.81 mol mol À1 at 298.2 K and 1 bar). More importantly, H 2 S molecule is activated by these SPILs during the absorption process, so that the activated H 2 S can be converted further into high value-added thiols in situ with excellent yields under mild conditions (303.2 K and 1 bar) without any solvents and metallic catalysts. Since H 2 Ssaturated SPILs can be regenerated by chemical conversion of absorbed H 2 S into thiols, thereby eliminating the higher input of energy consumption during the process of H 2 S stripping. This SPIL-mediated scheme provides an alternative approach for the capture and chemical conversion of H 2 S.

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Section: Introductionmentioning

confidence: 99%

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Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

et al. 2022

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“…The capture, storage and utilization (CCSU) CO2 has been considered an effective method to alleviate the problem [4][5][6][7]. Chemical conversion of CO2 to high-value-added products exhibits dramatic efficiency in economic and industrial sectors, and has been paid increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Perspective on CO2 Hydrogenation for Dimethyl Ether Economy

Liu

2022

Catalysts

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The CO2 hydrogenation to dimethyl ether (DME) is a potentially promising process for efficiently utilizing CO2 as a renewable and cheap carbon resource. Currently, the one-step heterogeneous catalytic conversion of CO2 to value-added chemicals exhibits higher efficiency than photocatalytic or electrocatalytic routes. However, typical catalysts for the one-step CO2 hydrogenation to DME still suffer from the deficient space–time yield and stability in industrial demonstrations/applications. In this perspective, the recent development of the one-step CO2 hydrogenation to DME is focused on different catalytic systems by examining the reported experimental results and the reaction mechanism including the catalytic nature of active sites, activation modes and of CO2 molecules under relevant conditions; surface intermediates are comparatively analyzed and discussed. In addition to the more traditional Cu-based, Pd-based, and oxide-derived bifunctional catalysts, a further emphasis is given to the characteristics of the recently emerged In2O3-based bifunctional catalysts for the one-step conversion of CO2 to DME. Moreover, GaN itself, as a bifunctional catalyst, shows over 90% DME selectivity and a reasonably high activity for one-step CO2 hydrogenation, and the direct hydrogenation of CO2 via the unique non-methanol intermediate mechanism is highlighted as an important illustration for exploring new catalytic systems. With these analyses and current understandings, the research directions in the aspects of catalysis and DME economy are suggested for the further development of one-step DME synthesis from CO2 hydrogenation.

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“…Given their high CO 2 solubility, ILs are very competitive absorbents compared to amines [ 13 ] plus they can also be used as catalysts, [ 14 ] allowing for the integration of CO 2 capture and conversion. [ 15 ] However, carbonate and IL separation by distillation has been revealed to be high energy‐consuming. [ 15a,16 ] Therefore, it was recently proposed to carry out this separation by liquid–liquid extraction, which reduces energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…[ 15 ] However, carbonate and IL separation by distillation has been revealed to be high energy‐consuming. [ 15a,16 ] Therefore, it was recently proposed to carry out this separation by liquid–liquid extraction, which reduces energy consumption. [ 16,17 ] Depending on whether the IL is hydrophilic or hydrophobic, either water or a long‐chain alcohol would be the preferred extracting solvent, respectively.…”

Section: Introductionmentioning

confidence: 99%

Toward Sustainable and Cost‐Effective CO₂ Conversion Processes to Propylene Carbonate Based on Ionic Liquids

Hernández

Belinchón

Pachón

et al. 2022

Advanced Sustainable Systems

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in ammonia production. Then, CO 2 can be used directly in a variety of applications, as a solvent, [3] refrigerant, [4] or carbonating agent in the beverage industry as well as as a raw material for the synthesis of other products. There are different types of CO 2 conversion to other products, which can be divided into reactions that incorporate the complete CO 2 molecule (carboxylation) or merely a part of the mole cule (reduction); [1a] presenting the former reactions much lower energy demand than the latter, which increases the interest in carboxylation reactions. Some products that can be obtained by carboxylation are ureas, [5] lactones, [1a] carboxylic acids, [1a] carbonates, [6] polycarbonates, [7] or polyurethanes. [8] To produce cyclic carbonates which find applications in common separations in the chemical industry [9] as well as being electrolytes for batteries [10] as final use, or are well-known monomers in the polymer industry [7,10] finding applications even in the biomedical field, [11] the use of ionic liquids (ILs) as catalysts in both homogeneous and heterogeneous phases has been suggested. [12] Figure 1 shows the reaction scheme to produce propylene carbonate from propylene oxide using ILs with the corresponding pressure and temperature conditions considered in this work. Given their high CO 2 solubility, ILs are very competitive absorbents compared to amines [13] plus they can also be used as catalysts, [14] allowing for the integration of CO 2 capture and conversion. [15] However, carbonate and IL separation by distillation has been revealed to be high energy-consuming. [15a,16] Therefore, it was recently proposed to carry out this separation by liquid-liquid extraction, which reduces energy consumption. [16,17] Depending on whether the IL is hydrophilic or hydrophobic, either water or a long-chain alcohol would be the preferred extracting solvent, respectively. [18] To advance in the development of more effective and sustainable IL-based CCU processes, techno-economic assessment and environmental impact evaluations need to be addressed comprehensively. It is necessary to analyze these systems globally, including the synthesis of the necessary compounds as well as the implications of their energy consumption and energy sources. [19] In this line, several studies have already been conducted on the environmental sustainability of CO 2 capture and storage processes, [20] including those based on ILs. [21] However, in the case of carbon utilization processes, due to the variety of The use of ionic liquids (ILs) for CO 2 capture and utilization into a valuable product is attracting interest even though literature evaluating their sustainability is scarce. A liquid-liquid extraction (LLE)-based separation is recently proposed as an alternative to the high energy-consuming distillation-based reference approach to produce propylene carbonate (PC). In this work, the environmental impacts associated to the distillation-based reference and two proposed LLE-based approaches to produce PC are eval...

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Integrated carbon capture and utilization based on bifunctional ionic liquids to save energy and emissions

Cited by 25 publications

References 38 publications

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Perspective on CO2 Hydrogenation for Dimethyl Ether Economy

Toward Sustainable and Cost‐Effective CO₂ Conversion Processes to Propylene Carbonate Based on Ionic Liquids

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Integrated carbon capture and utilization based on bifunctional ionic liquids to save energy and emissions

Cited by 25 publications

References 38 publications

Exceptionally effective H2S absorption and conversion into thiols in novel superbase protic ionic liquids

Exceptionally effective H2S absorption and conversion into thiols in novel superbase protic ionic liquids

Perspective on CO2 Hydrogenation for Dimethyl Ether Economy

Toward Sustainable and Cost‐Effective CO2 Conversion Processes to Propylene Carbonate Based on Ionic Liquids

Contact Info

Product

Resources

About

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Exceptionally effective H₂S absorption and conversion into thiols in novel superbase protic ionic liquids

Toward Sustainable and Cost‐Effective CO₂ Conversion Processes to Propylene Carbonate Based on Ionic Liquids