Determination of the Viscosity of the Ionic Liquids [bmim][PF6] and [bmim][TF2N] Under High CO2 Gas Pressure Using Sapphire NMR Tubes

Laurenczy, Gábor; Dyson, Paul J.

doi:10.1515/znb-2008-0614

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…As seen in Table 3, the conversion yield is decreased in the ionic liquid compared to organic solvents, which could be attributed to the low dispersability of the nanoflowers in these media. Moreover, the high viscosity of [BMIM][BF 6 ] (381 cP at 25 °C)[62] and ChCl:U (1200 mPa s at 25 °C)[63] could lead to mass-transfer limitations, restricting the biocatalytic activity of immobilized CaLB [64,65].…”

Section: Resultsmentioning

confidence: 99%

Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

et al. 2019

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In the present study, hybrid nanoflowers (HNFs) based on copper (II) or manganese (II) ions were prepared by a simple method and used as nanosupports for the development of effective nanobiocatalysts through the immobilization of lipase B from Pseudozyma antarctica. The hybrid nanobiocatalysts were characterized by various techniques including scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The effect of the addition of carbon-based nanomaterials, namely graphene oxide and carbon nanotubes, as well as magnetic nanoparticles such as maghemite, on the structure, catalytic activity, and operational stability of the hybrid nanobiocatalysts was also investigated. In all cases, the addition of nanomaterials during the preparation of HNFs increased the catalytic activity and the operational stability of the immobilized biocatalyst. Lipase-based magnetic nanoflowers were effectively applied for the synthesis of tyrosol esters in non-aqueous media, such as organic solvents, ionic liquids, and environmental friendly deep eutectic solvents. In such media, the immobilized lipase preserved almost 100% of its initial activity after eight successive catalytic cycles, indicating that these hybrid magnetic nanoflowers can be applied for the development of efficient nanobiocatalytic systems.

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Section: Resultsmentioning

confidence: 99%

Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

et al. 2019

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“…ILs are a type of organic molten salt with melting points close to or below room temperature. Their distinct qualities, such as exceptionally low volatility, great thermal stability, and excellent affinity with acidic gases, meet the general requirements of promising gas separation media. − Most crucially, we may modify the IL framework to specific needs. ILs have been demonstrated to be excellent solvents for the selective absorption of H 2 S and SO 2 .…”

Section: Methodsmentioning

confidence: 99%

Multiobjective Optimization and Sustainability Assessment of an Improved Wet Sulfuric Acid-Based Ionic Liquid Process for the Utilization of Hydrogen Sulfide Using a Symmetry Approach

et al. 2022

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Ionic liquids (ILs) are efficient media for the liquid-phase sulfuric acid reaction. Under mild situations, the reaction of H 2 S with CH 4 in ILs happens extremely quick and virtually complete, resulting in liquid sulfuric acid (H 2 SO 4(l) ). 1-hexyl-3methylimidazolium chloride ([hmim][Cl]) ILs were formerly the most effective at capturing and converting H 2 S. It can convert H 2 S to H 2 SO 4(l) with a proportion of up to 96%. This study aimed to develop cutting-edge techniques and assess their applicability for different acidic gas capacities and H 2 S amounts by considering three sustainability metrics which are people (safety), planet (ecological), and profit. Then, to maximize profit while lowering the global warming potential (GWP), fire explosion damage index (FEDI), and toxicity damage index (TDI), a multiobjective optimization (MOO) case was performed. The trade-off between economic, environmental, and safety performance was expressed through Pareto-optimal solutions. The improved wet sulfuric acid (WSA)-based IL method was safer (lower fire and explosion damage index), ecologically friendly (lower GWP), and portable. The findings indicate that the improved WSA-based on IL gives the optimum results compared to conventional WSA processes, such as the profit of 5688$/h increased from 1896$/h, the GWP of 0.0138-ton CO 2 -eq decreased from 0.0275-ton CO 2 -eq, the TDI of 6.72 decreased from 13.44, and the FEDI of 6.18 decreased from 20.6, respectively. This discovery opens the door to a viable strategy for capturing and converting H 2 S from an acid gas stream.

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“…The presence of CO2 (60 bar for 30 bar pressure of H2) increases the hydrogenation rate (full conversion after 30 min); no consecutive hydrogenation of cyclohexanone was observed. It is well-known that the presence of CO2 enhances the mass transfer in the reaction medium by diminishing the viscosity of the IL and increasing the solubility of H2 [88,89]. BMNPs containing two first row transition metals, Cu-Zn alloy nano-systems, have been prepared by Janiak and co-workers [90].…”

Section: Synthesis Of Bmnps In Ionic Liquids By Co-decomposition Of Mmentioning

confidence: 99%

Bimetallic Nanoparticles in Alternative Solvents for Catalytic Purposes

et al. 2017

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Bimetallic nanoparticles represent attractive catalytic systems thanks to the synergy between both partners at the atomic level, mainly induced by electronic effects which in turn are associated with the corresponding structures (alloy, core-shell, hetero-dimer). This type of engineered material can trigger changes in the kinetics of catalyzed processes by variations on the electrophilicity/nucleophilicity of the metal centers involved and also promote cooperative effects to foster organic transformations, including multi-component and multi-step processes. Solvents become a crucial factor in the conception of catalytic processes, not only due to their environmental impact, but also because they can preserve the bimetallic structure during the catalytic reaction and therefore increase the catalyst lifetime. In this frame, the present review focuses on the recent works described in the literature concerning the synthesis of bimetallic nanoparticles in non-conventional solvents, i.e., other than common volatile compounds, for catalytic applications.

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Determination of the Viscosity of the Ionic Liquids [bmim][PF₆] and [bmim][TF₂N] Under High CO₂ Gas Pressure Using Sapphire NMR Tubes

Cited by 8 publications

References 10 publications

Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

Multiobjective Optimization and Sustainability Assessment of an Improved Wet Sulfuric Acid-Based Ionic Liquid Process for the Utilization of Hydrogen Sulfide Using a Symmetry Approach

Bimetallic Nanoparticles in Alternative Solvents for Catalytic Purposes

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