Ultrathin mesoporous NiCo₂O₄ nanosheets as an efficient and reusable catalyst for benzylic oxidation

Abstract

5Ultrathin mesoporous NiCo 2 O 4 nanosheets as high efficient and reusable catalyst for benzylic oxidation have been prepared. The nanosheets are less than 5 nm in thickness, the pore distribution is in the range of 2-5 nm and the specific surface area of the nanosheets is about 81.0 m 2 g -1 . The ultrathin and mesoporous feature with high specific surface area not only provide large amount of binary active sites of Co and Ni, but also improve the contacting ability between the substrate and these active sites, therefore accelerating 10 the rate of reaction and providing high catalytic efficiency for benzylic oxidation. The NiCo 2 O 4 nanosheets are efficient heterogeneous catalyst in the oxidation of 4,4'-difluorodiphenylmethane into 4,4'difluorobenzophenone with a yield of 99%. Furthermore, the NiCo 2 O 4 nanosheets catalyst exhibits general applicability, convenient separability and good stability in the benzylic oxidation.

Nanosheets of CuCo2O4 As a High-Performance Electrocatalyst in Urea Oxidation

“…4 high-resolution spectrum for O 1s is shown in Figure 4d, which shows two peaks centered at 529.4 and 531.3 eV, respectively. The peak around 529.4 eV corresponded to metal-oxygen bonding, while the second peak corresponded to a high number of defect sites with low oxygen coordination in the material with a small particle size [21]. high-resolution spectrum for O 1s is shown in Figure 4d, which shows two peaks centered at 529.4 and 531.3 eV, respectively.…”

Rapid synthesis of Co, Ni co-doped ZnO nanoparticles: Optical and electrochemical properties

“…In Fig. 3 ( [37]. Furthermore, an analysis of the O 1s peak shows that it can be deconvoluted into three Gaussian-Lorentzian curves, as displayed in Fig.…”

MnO2@Fe3O4 Magnetic Nanoparticles as Efficient and Recyclable Heterogeneous Catalyst for Benzylic sp3 C−H Oxidation

“…Oxidants such as 4‐methyl pyridine‐ N ‐oxide, K 2 S 2 O 8 , TEMPO, and NHPI are failed to deliver or giving less yield of phenyl benzoate 2 a (Table , entries 2–5). Based on the previous studies, the role of the nitrogen‐containing ligand was pivotal in the benzylic sp 3 C−H oxidation reaction. This is because that nitrogen‐containing ligand such as triethylamine, pyridine, 2,2′‐bipyridine could behave as a hydrogen bond acceptor with TBHP to speed up the formation of t ‐butoxyl radical.…”