Superparamagnetic copper ferrite nanoparticles catalyzed aerobic, ligand-Free, regioselective hydroboration of alkynes: Influence of synergistic effect

Mohan, Balaji; Park, Kang Hyun

doi:10.1016/j.apcata.2016.03.019

Cited by 38 publications

(17 citation statements)

References 84 publications

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“…(8)). The enhancement in the degradation of TCA using Fe-Cu than single metallic samples are due to the combined effects of bimetals owing to enhancement in physical and chemical characteristics, which have been also investigated in various studies [19,56,57]. Furthermore, the formation of intermediates and final products was investigated by GC–MS analysis.…”

Section: Resultsmentioning

confidence: 99%

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Farooq

Danish

Brusseau

et al. 2017

Applied Catalysis A: General

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Experiments were conducted to investigate the use of graphene-oxide supported metallic nanocomposites for improving the degradation of trichloroethane (TCA) by sodium percarbonate (SPC). Two methods of production, chemical reduction (CR) and solvo-thermal (ST), were tested for preparation of single (Fe) and binary (Fe-Cu) nanocomposites supported by reduced graphene oxide (rGO). A variety of analytical techniques including N2 adsorption Brunauer-Emmett-Teller (BET), x-ray diffraction (XRD), fourier-transfrom infrared spectroscopy (FTIR), and transmisison electron microscopy (TEM) were applied to characterize the physicochemical and microstructural properties of the synthesized nanocomposites. The characterization indicated that the CR method produced nanocomposites that comprised only mesoporous structure. Conversely, both micro and mesoporous structures were present for samples produced with the ST method. The synthesized single and bimetallic composites produced from the ST method showed higher surface areas, i.e. 93.6 m2/g and 119.2 m2/g as compared to the ones synthesized via the CR method, i.e. 13.8 m2/g and 38.0 m2/g respectively. The results of FTIR and XRD analyses confirmed that the ST method produced highly crystalline nanocomposites. SEM and TEM analysis validated that metallic particles with definite morphology well distributed on the surface of rGO. X-ray photoelectron spectroscopy (XPS) analysis confirmed the homogeneity nanocomposites and occurrence of variation in copper oxidation states during degradation process. EDS mapping validate the homogeneous distribution of Cu and Fe at reduced graphene oxide surface. The Fe-Cu/rGO (ST) activated SPC system effectively degraded TCA (92%) in 2.5 h at low nanocomposite dose compared to the Fe-Cu/rGO (CR) and only Fe, for which the maximum degradation efficiencies achieved were 81% and 34%. In conclusion, excellent catalytic characteristics were observed for the ST-synthesized single and bimetallic (Fe/rGO, Fe-Cu/rGO) catalysts. These catalysts were successful in improving the degradation of TCA via activated SPC.

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Section: Resultsmentioning

confidence: 99%

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Farooq

Danish

Brusseau

et al. 2017

Applied Catalysis A: General

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“…The more ionic Cu-O bond leads to the catalytic production of important compounds, vinylboronates, a versatile class of intermediates for construction of numerous valuable complex molecules. [20][21][22][23] For now, the heterogeneous catalytic hydroboration of alkynes presents a straightforward and cost-efficient approach to access these vinylboronates [24][25][26][27][28][29][30] but generally suffering from the requirement of ligands or bases as additional additives, which results in higher costs and more waste in the reaction. In this work, a melamine-formaldehyde resin (MF) coating layer between Cu atoms and the ceria can decompose and disappear from the high temperature heat treatment, resulting in the more ionic Cu-O bond in the final catalyst (denoted as Cu 1 -O(I)/CeO 2 ).…”

Section: The Bigger Picturementioning

confidence: 99%

“…For now, the heterogeneous catalytic hydroboration of alkynes mainly depends on supported Cu catalysts. [24][25][26][27][28][29] These catalysts require ligands or bases as necessary additives because they can facilitate the formation of the crucial boryl copper species and thus promote the reaction pathway. [50][51][52] When these additives are absent, the hydroboration process is usually difficult to carry out smoothly.…”

Section: Catalytic Performance Evaluation For Hydroboration Of Alkynesmentioning

confidence: 99%

Tuning Polarity of Cu-O Bond in Heterogeneous Cu Catalyst to Promote Additive-free Hydroboration of Alkynes

Zhang

Wang

Chen

et al. 2020

Chem

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The concept of chemical bond polarity is well recognized; however, its tunability and corresponding effects on heterogeneous catalysis have never been discussed. Here, we report a method to control the polarity of the Cu-O bond in the heterogeneous Cu catalyst, and thus tune its activity for the hydroboration reaction. By synthetic procedure control, single-atomic-site Cu catalysts on ceria with more ionic Cu-O bonds (Cu 1 -O(I)/CeO 2 ) and with more covalent Cu-O bonds (Cu 1 -O(C)/CeO 2 ) can be obtained, respectively. The more ionic Cu-O bond makes Cu 1 -O(I)/CeO 2 display a much higher activity than Cu 1 -O(C)/CeO 2 in selective hydroboration of diverse alkynes with no additives, producing versatile vinylboronate compounds. The enhanced activity stems from the more ionic Cu-O bond facilitating the formation of key intermediate copper ethoxide species by dissociating ethanol molecules. These results may improve our understanding of the correlation between the nature of chemical bonds and catalytic properties and lead to better-performing heterogeneous catalysts.

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“…Superparamagnetic nanoparticles would integrate profits of high catalytic efficiency with ready recovery through magnetic isolation protocols ,. Unfunctionalized superparamagnetic nanoparticles have emerged as productive heterogeneous catalysts for many reactions . Recently, Xu et al.…”

Section: Introductionmentioning

confidence: 99%

Ready Access to 3‐Substituted Quinoxalin‐2‐ones under Superparamagnetic Nanoparticle Catalysis

Nguyen

Phan

et al. 2018

ChemistrySelect

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Fe2O3 superparamagnetic nanoparticles emerged as a productive recyclable heterogeneous catalyst for the cyclization reaction between α‐keto acids and benzene‐1,2‐diamines to produce quinoxalinones as major products and benzimidazoles as minor products. The Fe2O3 nanoparticles displayed higher activity in the synthesis of quinoxalinones than a series of nano catalysts as well as iron‐, copper‐, nickel‐, and cobalt‐based homogeneous catalysts. Moreover, the Fe2O3 nanoparticles was easily recovered by magnetic decantation, and was reutilized without a remarkable deterioration in catalytic activity and selectivity towards quinoxalinones. To our best knowledge, this transformation was not previously conducted under heterogeneous catalysis conditions.

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Superparamagnetic copper ferrite nanoparticles catalyzed aerobic, ligand-Free, regioselective hydroboration of alkynes: Influence of synergistic effect

Cited by 38 publications

References 84 publications

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Tuning Polarity of Cu-O Bond in Heterogeneous Cu Catalyst to Promote Additive-free Hydroboration of Alkynes

Ready Access to 3‐Substituted Quinoxalin‐2‐ones under Superparamagnetic Nanoparticle Catalysis

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