The electrocatalytic behaviour of Pt and Cu nanoparticles supported on carbon nanotubes for the nitrobenzene reduction in ethanol

Wouters, Benny; Sheng, Xia; Boschin, Andrea; Breugelmans, Tom; Ahlberg, Elisabet; Vankelecom, Ivo F.J.; Pescarmona, Paolo P.; Hubin, Annick

doi:10.1016/j.electacta.2013.07.210

Cited by 41 publications

(47 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…employed as a stabilizer. EG is not an efficient reductant at room temperature, but it forms a NaB(OCH 2 CH 2 OH) 4 complex with NaBH 4 , [22] which can play a similar role to that of sodium acetate in the other synthesis method. TEM images of the prepared materials demonstrate that both methods are suitable for generating Pt-Cu nanoparticles with the desired small size (ca.…”

Section: Synthesis and Characterization Of The Pt And Pt-cu Electrocamentioning

confidence: 97%

“…[35,36] The slopes of the K-L plots (Figure 8 C) correspond to a fourelectron exchange process, which is identified as the reduction of NB to PHA (Scheme 1). [4] The same number of electrons per molecule of nitrobenzene is also being exchanged at this potential if the AC(N) support alone is employed as electrocatalyst (Figures 8 C and S6). This indicates that the same reaction occurs on the supported nanoparticles and on the support alone (although the activity of the latter is much lower; see below).…”

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 98%

“…The supported nanoparticles obtained with this method consist of a mixture of metallic Cu and Cu II phases. Mild reductants, such as NaBH 4 and EG, can only reduce Cu II to Cu I . Small Cu 2 O particles can be prepared by NaBH 4 , whereas only aggregates are obtained with the EG method.…”

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 99%

“…The method with H 2 as reductant is based on a procedure that was recently developed by our groups for the preparation of Cu-Cu x O nanoparticles supported on multiwalled carbon nanotubes. [4,8] In the method with N 2 H 4 as reductant, the use of a surfactant (cetyltrimethylammonium bromide; CTAB) was also explored. [31] TEM images of Cu-Cu x O nanoparticles prepared with H 2 as reductant highlight the crucial role exerted by the support in determining the features of the nanoparticles ( Figure 5).…”

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 99%

“…Therefore, nitrosobenzene is not expected to accumulate. [4] PHA is a very unstable compound, and can react further both through a chemical and an electrochemical path. [5,6] For example, if the electrochemical reduction of PHA to aniline is not achieved, the main product of the reaction could be azoxybenzene (AOB), which is obtained through partial oxidation of PHA with oxygen (present in solution or by contact with air) followed by condensation (Scheme 1, path 2).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Pure and Alloyed Copper‐Based Nanoparticles Supported on Activated Carbon: Synthesis and Electrocatalytic Application in the Reduction of Nitrobenzene

et al. 2014

Self Cite

View full text Add to dashboard Cite

A series of Cu–CuxO, Pt–Cu alloy, and Pt nanoparticles supported on inexpensive activated carbon with large surface area were developed as electrocatalysts for the reduction of nitrobenzene. This reaction can produce useful chemicals with the potential to cogenerate electricity if applied in a fuel cell. Both the nature of the metal employed and of the carbon material used as support play an important role in determining the performance of the electrocatalysts. Cu‐based materials display lower onset potentials for the reduction of nitrobenzene, whereas the features of the activated carbon influence the stability of the electrocatalysts. The most promising electrocatalyst consisted of highly dispersed and very small Cu–CuxO nanoparticles (∼4 nm) supported on Norit activated carbon, which were prepared using H2 as reductant. A chronoamperometric test in acidic ethanolic medium gave good conversion of nitrobenzene over this electrocatalyst, with azoxybenzene as the major product.

show abstract

Section: Synthesis and Characterization Of The Pt And Pt-cu Electrocamentioning

confidence: 97%

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 98%

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 99%

Section: Syntheses and Characterization Of The Cu-cu X O Electrocatalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pure and Alloyed Copper‐Based Nanoparticles Supported on Activated Carbon: Synthesis and Electrocatalytic Application in the Reduction of Nitrobenzene

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

Selective Catalytic Hydrogenation of Nitroarenes to Anilines

Gao

Peng

Zou

2023

Industrial Arene Chemistry

View full text Add to dashboard Cite

Role of Pd in the Electrochemical Hydrogenation of Nitrobenzene Using CuPd Electrodes

Carvajal

Arcas

Mesa

et al. 2022

Advanced Sustainable Systems

View full text Add to dashboard Cite

store energy due to its high-density energy per weight unit. [3] Additionally, the reduction of CO 2 , to energy-rich chemicals (CO, formic acid, methane, methanol, etc.), has been recently gaining increasing attention these days. In this line, there are other alternative chemical transformations, such as the synthesis of products for the chemical industry, which despite being much less developed, [4] may present an intrinsic economical interest. [5] An interesting transformation for the chemical industry is the reduction of nitrobenzene to aniline, a species widely employed as building block for the production of dyes, explosives, pesticides and drugs. [6] Traditionally, the production of aniline has been achieved by organic synthesis using homogeneous catalysis, [7] heterogeneous catalysis, [8] photocatalysis, [9] photoelectrocatalysis, [10] as well as biocatalysis.. [11] In the industry, the standard method to synthesize aniline is the catalytic vapour-phase hydrogenation using fixed-bed or fluidized-bed vapor-phase processes. For example, in the industrial procedure developed by Bayer, nitrobenzene and hydrogen are mixed at 100-700 kPa (in 1:120 molar ratio) and injected into a reactor that contains Pd on activated charcoal as catalyst. This process requires initial thermal activation of 250-300 °C. [12] With the aim to produce aniline through a more sustainable process, we focus on the electrocatalytic reduction of nitrobenzene, working under ambient conditions of temperature and pressure. [13] The electrochemical reduction of nitrobenzene to aniline is a complex reaction that takes place through 3-steps, involving 6 electrons and 6 protons that may yield to other side-reactions as shown in Figure 1. Each step involves the insertion of 2eand 2H + species in the NO 2 group of the molecule until leading to the complete substitution of the oxygens by hydrogen atoms, with the formation of one molecule of aniline and two molecules of water. During the electro-reduction, two intermediate species, namely, nitrosobenzene and phenylhydroxylamine are formed. [14] To reach an effective reduction and hydrogenation, this organic transformation requires the formation (and stabilization) [15] of abundant H * radicals in the electrode surface. This requirement highlights the importance of developing materials capable of producing H * in order to succeed in this electro-transformation.Interest in the electrochemical reduction of organic compounds as an alternative to hydrogen electrosynthesis is driven, among other reasons, by the fact that the products obtained in this process may have more economic value than H 2 . Furthermore, the technique, coupled with renewable sources of electricity, may open the door for large volume green chemical synthesis. In the present article, the electrochemical reduction and hydrogenation of nitrobenzene to aniline at neutral pH is focused upon, using copper electrodes with and without palladium decoration. Both electrodes present good activity, with a decrease in the overpotential for ni...

show abstract

The electrocatalytic behaviour of Pt and Cu nanoparticles supported on carbon nanotubes for the nitrobenzene reduction in ethanol

Cited by 41 publications

References 17 publications

Pure and Alloyed Copper‐Based Nanoparticles Supported on Activated Carbon: Synthesis and Electrocatalytic Application in the Reduction of Nitrobenzene

Pure and Alloyed Copper‐Based Nanoparticles Supported on Activated Carbon: Synthesis and Electrocatalytic Application in the Reduction of Nitrobenzene

Selective Catalytic Hydrogenation of Nitroarenes to Anilines

Role of Pd in the Electrochemical Hydrogenation of Nitrobenzene Using CuPd Electrodes

Contact Info

Product

Resources

About