Oxidation studies on mono (Cu, Ni) and bimetallic (Cu–Ni) nanoparticles and its impact on catalytic activity

Srivastava, Vivek; Preethi, S.; Kumar, T. H. Vignesh; Sundramoorthy, Ashok K.; Babu, K. Suresh

doi:10.1016/j.jallcom.2019.152608

Cited by 33 publications

(9 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure a shows the spectra of Cu 2p, exhibiting peaks at 952.2 and 932.1 eV corresponding to Cu 2p 1/2 and Cu 2p 3/2 , respectively. The energy difference between the two spin states of Cu 2p 1/2 and Cu 2p 3/2 was 20.1 eV due to the spin–orbit coupling, which was consistent with the value in the literature . Further, there were no satellite peaks in the Cu 2p spectra except the two main peaks, indicating that no Cu 2+ existed on the surface of the particles.…”

Section: Results and Discussionsupporting

confidence: 89%

“…The energy difference between the two spin states of Cu 2p 1/2 and Cu 2p 3/2 was 20.1 eV due to the spin−orbit coupling, which was consistent with the value in the literature. 25 Further, there were no satellite peaks in the Cu 2p spectra except the two main peaks, indicating that no Cu 2+ existed on the surface of the particles. The Cu LMM Auger electron spectra were used to determine the existence of Cu in the valence of +1.…”

Section: Resultsmentioning

confidence: 90%

See 1 more Smart Citation

Magnetic CuNi Alloy Nanoparticles for Catalytic Transfer Hydrogenation of Nitroarene

Shi

Dai

Liu

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Magnetic CuNi alloy nanoparticles (CuNi NPs) for the catalytic transfer hydrogenation (CTH) of nitroarene were successfully prepared by the facile thermal decomposition of copper formate (Cuf) and nickel formate (Nif) simultaneously. Liquid paraffin served as solvent, and oleylamine (OAM) acted as both complexing agent and stabilizer. The particle size and Cu/Ni composition of CuNi NPs could be controlled by adjusting the amount of OAM and the Cu/Ni ratio of the precursor. The average diameter of the prepared CuNi NPs ranged from 10.2 to 56.9 nm. It had been confirmed that CuNi NPs were an alloy of Cu and Ni and effectively resistant to oxidation. The prepared CuNi NPs could be separated under an external magnetic field without any energy consumption since they were superparamagnetic. Among the prepared CuNi NPs with different compositions, the Cu3Ni7 NPs were the best catalyst for catalytic transfer hydrogenation of nitrobenzene with ethylene glycol (EG) as the hydrogen donor, giving a nitrobenzene conversion of 99% and an aniline yield of >97%. The conversion and yield remained above 95% and 80% respectively after 10 cycles of NOBF4-treated Cu3Ni7 NPs, demonstrating good reusability for the CTH reaction. This work reported a novel method for preparing magnetic CuNi NPs and also provided a new approach for the hydrogenation of nitroarene catalyzed by non-noble metals in a green environment.

show abstract

Section: Results and Discussionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 90%

Magnetic CuNi Alloy Nanoparticles for Catalytic Transfer Hydrogenation of Nitroarene

Shi

Dai

Liu

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Overall, the reducibility of the catalyst was enhanced, thus promoting the CO-SCR reaction. 29 Therefore, under the premise of nitric acid activation, the 6Cu–4Ni–5Ce/AC 1 catalyst can reach the highest denitration rate of 99.8%.…”

Section: Resultsmentioning

confidence: 96%

Influence of cerium doping on Cu–Ni/activated carbon low-temperature CO-SCR denitration catalysts

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The active component CuO is highly dispersed on the surface of the 10Cu–4Ni/AC catalyst, and there is a strong synergy between the active components of copper–nickel oxide. Owing to the doping of NiO, the tensile force exerted on the CuO grain boundary reduces the Cu–Ni structure . To observe the Cu- and Ni-EDS, the SEM micrograph of 8Cu–5Ni/AC × 2000 is selected as shown in Figure g.…”

Section: Results Discussion and Analysismentioning

confidence: 99%

“…Owing to the doping of NiO, the tensile force exerted on the CuO grain boundary reduces the Cu−Ni structure. 21 To observe the Cu-and Ni-EDS, the SEM micrograph of 8Cu− 5Ni/AC × 2000 is selected as shown in Figure 3g. The EDS results of Cu-EDS are shown in Figure 3h and those of Ni-EDS in Figure 3i; copper and nickel are uniformly dispersed on the surface of the catalyst.…”

Section: Methodsmentioning

confidence: 99%

Cu–Ni/AC Catalyst for Low-Temperature CO-Selective Catalytic Denitration Mechanism

Wang

Huang

Shi

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

To study the preparation principle of Cu−Ni/AC catalysts and the mechanism of low-temperature CO-selective catalytic reduction (SCR) denitration, Cu−Ni/AC catalysts with different metal loadings were prepared by the isometric ultrasonic impregnation method. It was determined that the 10Cu−4Ni/AC catalyst had the best CO-SCR low-temperature denitration rate of 94.2% in 5% O 2 and at the denitration temperature of 150 °C. The characterization of Cu−Ni/AC by scanning electron microscopy (SEM), Brunauer−Emmett−Teller (BET), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and CO temperature-programmed desorption (TPD) confirmed that the copper−nickel-coordinated loading resulted in the Cu−Ni/AC catalyst having a rich pore structure and a large number of acidic oxygen-containing functional groups. The spherical particles of copper−nickel oxide with good thermal stability were highly dispersed on the AC surface, allowing the copper and nickel metal ions to enter the graphite or graphite-like microcrystalline structure and split into smaller irregular graphene fragments, thus forming a large number of denitration reaction units on the AC surface. The oxidation−reduction reaction (Cu 2+ + Ni 2+ → Cu + + Ni 3+ ) between copper and nickel metal oxides produced active oxygen vacancies, which increased the amount of oxygen (Oa) adsorbed on the surface, especially acidic adsorption sites on the surface; this promoted the higher adsorption of reaction gases (CO, O 2 , NO), leading to the conversion of a standard SCR reaction to a fast SCR reaction, which, in turn, improved the denitration efficiency. The CO-SCR denitrification mechanism model of the Cu−Ni/AC catalyst was discovered and established according to the experimental results and theoretical analysis. The related research provides a reference for carbon-based catalysts for low-temperature CO-SCR denitration.

show abstract

Oxidation studies on mono (Cu, Ni) and bimetallic (Cu–Ni) nanoparticles and its impact on catalytic activity

Cited by 33 publications

References 45 publications

Magnetic CuNi Alloy Nanoparticles for Catalytic Transfer Hydrogenation of Nitroarene

Magnetic CuNi Alloy Nanoparticles for Catalytic Transfer Hydrogenation of Nitroarene

Influence of cerium doping on Cu–Ni/activated carbon low-temperature CO-SCR denitration catalysts

Cu–Ni/AC Catalyst for Low-Temperature CO-Selective Catalytic Denitration Mechanism

Contact Info

Product

Resources

About