Novel and Efficient Knoevenagel Condensation over Mesoporous SBA‐15 Supported Acetate‐functionalized Basic Ionic Liquid Catalyst

Li, Jing Rui; Chen, Chen; Hu, Yu Lin

doi:10.1002/slct.202004048

Cited by 17 publications

(2 citation statements)

References 49 publications

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“…First, synthesis of the ILs were performed according to the literature with some variations [43][44][45][46]. The synthesis of TiO2-4 was performed according to reported procedures [47].…”

Section: Modification Of Tio2 With Ionic Liquids (Ils)mentioning

confidence: 99%

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Godard,

Fernández Martínez

2024

Preprint

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TiO2-supported Pd-NPs based materials were prepared following two distinct approaches: for the first set of materials 1-8, modification of the TiO2 support was performed prior to Pd NPs deposition while the 2nd set (9-15) was synthesized by deposition of modifiers over pre-synthesized Pd-PPh3/TiO2. These catalysts were applied in the hydrogenation of CO2 to formate and their performance compared with that of the unmodified Pd-PPh3/TiO2. Modification of the TiO2 support by organosilanes provided a beneficial effect in catalysis compared with the catalyst containing unmodified TiO2 or TiO2 modified by organophosphonic acids. In contrast, in most cases, the deposition of modifiers over previously synthesized Pd NPs supported on TiO2 was not beneficial to the activity of the catalyst. Interestingly, upon recycling, the first set of catalysts suffered a rapid decrease in activity while the anchoring of modifiers over previously formed Pd NPs showed an improved stability (TON &gt; 500 after the 3rd recycling).

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“…First, synthesis of the ILs were performed according to the literature with some variations [43][44][45][46]. The synthesis of TiO2-4 was performed according to reported procedures [47].…”

Section: Modification Of Tio2 With Ionic Liquids (Ils)mentioning

confidence: 99%

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Godard,

Fernández Martínez

2024

Preprint

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“…On the other hand, these compounds can also exhibit catalytic activity 32,33 . To date various IL-based catalysts have been developed for various chemical transformations [34][35][36][37][38][39] .…”

mentioning

confidence: 99%

Pd on thermo-responsive composite of silica-coated carbon nanotube and 1-vinyl-3-butylimidazolium-based ionic liquid copolymers as an efficient catalyst for hydrogenation of nitro compounds

Sadjadi

Abedian-Dehaghani

Heravi

2022

Sci Rep

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In this work, an ionic liquid-containing thermo-responsive heterogeneous catalyst with utility for promoting hydrogenation of nitro-compounds in aqueous media is developed. To prepare the catalyst, silica-coated carbon nanotubes were synthesized and vinyl-functionalized. The resulted compound was then polymerized with 1-viny-3-butylimidazolium bromide and N-isopropylacrylamide. The obtained ionic liquid-containing thermo-responsive composite was palladated via wet-impregnation method to give the final catalyst. Study of the performance of the catalyst confirmed high catalytic activity of the catalyst at temperature above the lower critical solution temperature. Furthermore, the catalyst was highly recyclable and showed negligible Pd leaching upon recycling. Broad substrate scope and selectivity of the catalyst towards reduction of nitro functionality were also confirmed. Furthermore, hot filtration test implied the heterogeneous nature of the catalysis. The comparison of the activity of Pd/CNT-P with some control catalysts approved the importance of hybridization of P and CNT and the presence of ionic liquid for the catalytic activity.

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Riveting Hydroxyl Ionic Liquids onto Melem Oligomers for CO₂ Cycloaddition into Cyclic Carbonates

Ding

et al. 2021

ChemistrySelect

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The product of cyclic carbonates from carbon dioxide (CO2) and epoxides under solvent‐free and co‐catalyst‐free conditions is an environmental‐friendly and economical route. However, the core of this route lies in the design and preparation of efficient and low‐cost catalysts. In this work, hydroxyl ionic liquids (HEIMBr) modified melem oligomers (CN‐HEIMBr) was fabricated and used for the cycloaddition of CO2 into cyclic carbonates. The characterizations for these catalysts, such as XPS, TGA, SEM, FT‐IR, etc, all confirmed that HEIMBr was successfully grafted onto melem oligomers. The synergistic effects of edge defects (−NH and −NH2) of melem oligomers, hydroxyl groups and halogen anions of ionic liquids were conductive to promoting CO2 cycloaddition. The influences of CO2 pressure, catalyst dosage, reaction time and temperature on the conversion and yield were investigated in detailed. In the conditions of co‐catalyst‐free and solvent‐free, the conversion of epichlorohydrin (ECH) was 99 % and the yield of chloropronene carbonate (CPC) was 97 % under optimal conditions (140 °C, 2.0 MPa, 2 h, catalyst 0.1 g, ECH 30 mmol). Moreover, the catalyst was reused at least five runs without any significantly loss of catalytic performance. Furthermore, a credible multi‐synergetic catalytic mechanism was proposed. An originality idea was provided for designing high‐efficiency catalysts for coupling of CO2 and epoxides, and put forward the multi‐synergistic effects of catalysts on CO2 conversion.

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Novel and Efficient Knoevenagel Condensation over Mesoporous SBA‐15 Supported Acetate‐functionalized Basic Ionic Liquid Catalyst

Cited by 17 publications

References 49 publications

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Pd on thermo-responsive composite of silica-coated carbon nanotube and 1-vinyl-3-butylimidazolium-based ionic liquid copolymers as an efficient catalyst for hydrogenation of nitro compounds

Riveting Hydroxyl Ionic Liquids onto Melem Oligomers for CO₂ Cycloaddition into Cyclic Carbonates

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Novel and Efficient Knoevenagel Condensation over Mesoporous SBA‐15 Supported Acetate‐functionalized Basic Ionic Liquid Catalyst

Cited by 17 publications

References 49 publications

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Molecular TiO2 Modifications of Supported PPh3-Capped Pd Nanocatalysts for the CO2 Hydrogenation into Formates

Pd on thermo-responsive composite of silica-coated carbon nanotube and 1-vinyl-3-butylimidazolium-based ionic liquid copolymers as an efficient catalyst for hydrogenation of nitro compounds

Riveting Hydroxyl Ionic Liquids onto Melem Oligomers for CO2 Cycloaddition into Cyclic Carbonates

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Riveting Hydroxyl Ionic Liquids onto Melem Oligomers for CO₂ Cycloaddition into Cyclic Carbonates