Promoting Effect of Ball Milling on the Functionalization and Catalytic Performance of Carbon Nanotubes in Glycerol Etherification

Molecules, Journal Year: 2024, Volume and Issue: 29(7), P. 1623 - 1623

Published: April 4, 2024

A facile and eco-friendly approach using in situ-generated 4-benzenediazonium sulfonate (BDS) was applied to prepare highly functionalized carbon nanotubes (CNTs). The effectiveness of this functionalization additionally enhanced by a green short-time ball milling process beforehand. obtained BDS-modified CNTs presented significant activity glycerol etherification, producing tert-butyl ethers, which are considered promising fuel additives. Excellent results ~56% conversion ~10% yield higher-substituted ethers were within just 1 h reaction at 120 °C low catalyst loading only 2.5 wt.%. Furthermore, the sulfonated reusable over several cycles, with minor decrease activity. Additionally, sample could be restored simple regeneration approach. Finally, clear correlation found between content -SO3H groups on surface catalytic performances these materials etherification. Improved interaction ball-milled reactants also suggested positively affect catalysts tested process.

Language: Английский

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Synthesis of Solketal Catalyzed by Acid-Modified Pyrolytic Carbon Black from Waste Tires

Molecules, Journal Year: 2024, Volume and Issue: 29(17), P. 4102 - 4102

Published: Aug. 29, 2024

Solketal, a widely used glycerol-derived solvent, can be efficiently synthesized through heterogeneous catalysis, thus avoiding the significant product losses typically encountered with aqueous work-up in homogeneous catalysis. This study explores catalytic synthesis of solketal using solid acid catalysts derived from recovered carbon blacks (rCBs), which are obtained pyrolysis end-of-life tires. was further converted into introduction acidic functional groups concentrated H

Language: Английский

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Active Sites in Carbocatalysis: Tuning Their Activity

Catalysts, Journal Year: 2025, Volume and Issue: 15(5), P. 443 - 443

Published: May 1, 2025

Carbocatalysis, i.e., catalysis by metal-free carbon-based materials, has recently emerged as a “green” alternative for several thermal-, electric-, and solar-driven chemical processes in the gas phase liquid phase. Indeed, addition to their more common role catalyst support, carbon materials can promote large variety of reactions, replacing metal or oxide catalysts. However, active sites are seldom identified properly quantified, making it impossible calculate turnover frequencies benchmark novel catalysts with those traditionally used. In order advance field, is essential correlate catalytic properties surface chemistry. this work, we review small selection reactions catalyzed emphasizing synthesis methodologies characterization techniques used identify sites, where relevant structure-activity relationships could be established.

Language: Английский

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The role of mechanochemical treatment of carbon nanotubes in promoting glycerol etherification

Catalysis Science & Technology, Journal Year: 2024, Volume and Issue: 14(11), P. 3184 - 3200

Published: Jan. 1, 2024

Carbon nanotubes (CNTs) were functionalized and compared, for the first time applying various mechanochemical methods to endow their surfaces with strongly acidic features. The as-prepared samples used as catalysts in glycerol etherification.

Language: Английский

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Advances in Electrically and Thermally Conductive Functional Nanocomposites Based on Carbon Nanotubes

Polymers, Journal Year: 2024, Volume and Issue: 17(1), P. 71 - 71

Published: Dec. 30, 2024

The paper presents a review of CNTs synthesis methods and their application as functional filler to obtain polymer composites for various technical purposes strain gauges, electrical heating, anti-static coatings, electrically conductive compounds, etc. Various allow with different morphology structural properties be created, which expands the possibilities such nanoscale structures. Polymers can provide effects ‘shape memory’ self-repair mechanical defects. Different combinations polymers dispersed fillers influence change in thermal conductivity, well positive temperature coefficient resistance, makes it possible achieve effect self-regulation during heating. make form PTCR (positive resistance) elastomers at lower concentrations, preserve strength use more efficient modes heat generation. For improve sensitivity extend measurement range. thermoplastic provides operation electric heating level 200 °C (voltage 240 V), allows heaters operate power supply from household network. CNTs-based gauges condition monitoring composite materials.

Language: Английский

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