Novel synthesis of highly catalytic active Cu@Ni/RGO nanocomposite for efficient hydrogenation of 4-nitrophenol organic pollutant

Krishna, Rahul; Fernandes, Diana M.; Ventura, J.; Freire, Cristina; Titus, Elby

doi:10.1016/j.ijhydene.2015.12.027

Cited by 61 publications

(24 citation statements)

References 35 publications

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“…This fact indicates that the presence of the bimetallic catalyst results in a superior catalytic system, compared with both monometallic samples separately. This result is in accordance with the literature findings, which reveal superior catalytic performance in this reaction for bimetallic nanostructures in comparison with the monometallic counterparts [35][36][37][38][39].…”

Section: Catalytic Testssupporting

confidence: 93%

“…The other one, known as the charge redistribution effect, is due to electronic effects, which can facilitate the hydrogenation of the nitro-group [36], an explanation for AuPd bimetallic systems can be found in references [40,41]. Krisnha and coworkers attributed the enhancement of the catalytic performance of the bimetallic system CuNi [37] or AgCo [42] on the basis of synergetic effect via spill-over mechanism. In our work, we have shown that a small loading addition of Pd (1 %wt) to Cu (5%) greatly reduces the nanoparticle size from 7.1 to 2.7 nm, generating more active sites (higher dispersion).…”

Section: Catalytic Testsmentioning

confidence: 99%

“…However, given that the catalytic activity obtained by the Cu-Pd supported-MgO catalysts is highly comparable with other reported catalysts, we believe that magnesium oxide can represent a cost-effective alternative to these expensive nanocarbon supports. Also our CuPd/ MgO outperforms the catalytic activity of other bimetallic systems containing Cu or Pd such as CuNi [37] or NiPd [44][45][46].…”

Section: Catalytic Testsmentioning

confidence: 99%

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CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Morales¹

2018

Int. J. Green Technol.

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Abstract:In this work, we report the synthesis and characterization of a catalyst based on bimetallic CuPd nanostructures generated over a magnesium oxide support. Its catalytic activity and reusability have been tested in the reduction of 4-nitrophenol as a model reaction using NaBH4 as the source of hydrogen for the reduction of the nitro-group. The structure, composition and morphology of the catalysts were studied by N2 physisorption, X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The reaction kinetics of reduction of 4-nitrophenol to 4-aminophenol has been followed by UV-visible spectrophotometry, and its apparent rate constant has been determined and compared with its monometallic counterparts. All the tested catalysts exhibited remarkable high activity and excellent stability upon reuse for multiple consecutive cycles. We found out that a small loading addition of Pd to Cu catalyst greatly improved the catalytic activity in comparison with the monometallic samples. Our characterization results pointed out a higher metallic dispersion degree as the main explanation for this enhanced performance. CuPd/MgO is highly competitive or outperforms the catalytic activity of other bimetallic systems reported in literature.

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Section: Catalytic Testssupporting

confidence: 93%

Section: Catalytic Testsmentioning

confidence: 99%

Section: Catalytic Testsmentioning

confidence: 99%

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CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Morales¹

2018

Int. J. Green Technol.

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“…Thanks to the feasibility to tuning size and elemental composition of Cu/Ni alloy nanospheres that is enabled by the current work, we would be able to investigate the dependence of catalytic activity on their size and elemental composition. [46][47][48][49][50][51][52][53] Herein, we chose the reduction of 4-NP as the model reaction and employ the as-prepared Cu/Ni products loaded on carbon as the catalysts. 4-NP as an organic matter with highly toxic is difficult to be biodegradable which will cause great pollution to the ecological environment.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of Cu/Ni alloy nanospheres with tunable size and elemental ratio

2017

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“…Furthermore, due to the ferromagnetic property of nanocomposite the catalyst could be easily separated by an external magnetic field. Again, Krishna et al . synthesized non‐noble metal based catalyst, Cu@Ni/RGO using simple two step method.…”

Section: Cu−m′ (M′=fe Co Ni) Nanoparticle Catalystsmentioning

confidence: 99%

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

Deka

Borah

Saikia

et al. 2018

The Chemical Record

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This account provides an overview of current research activities on nanoparticles containing the earth-abundant and inexpensive element copper (Cu) and Cu-based nanoparticles, especially in the field of environmental catalysis. The different synthetic strategies with possible modification of the chemical/ physical properties of these nanoparticles using such strategies and/or conditions to improve catalytic activity are presented. The design and development of support and/or bimetallic systems (e. g., alloys, intermetallic, etc.) are also included. Herein, we report synthetic approaches of Cu and Cu-based nanoparticles (monometallic copper, bimetallic copper and copper (II) oxide nanoparticles/nanostructures) and impregnation of such nanoparticles onto support material (e. g., Co O nanostructure), along with their applications as environmental catalyst for various oxidation and reduction reactions. Finally, this account provides necessary advances and perspectives of Cu-based nanoparticles in the environmental catalysis.

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Novel synthesis of highly catalytic active Cu@Ni/RGO nanocomposite for efficient hydrogenation of 4-nitrophenol organic pollutant

Cited by 61 publications

References 35 publications

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Facile synthesis of Cu/Ni alloy nanospheres with tunable size and elemental ratio

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

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