Active and efficient Co-N/C catalysts derived from cobalt porphyrin for selective oxidation of alkylaromatics

Chen, Yuan; Jie, Shanshan; Yang, Chao; Liu, Zhigang

doi:10.1016/j.apsusc.2017.04.246

Cited by 58 publications

(22 citation statements)

References 48 publications

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“…The C1s spectrum reveals four types of carbon species: C=C at 284.6 eV, C=N at 285.7 eV, C−N 286.6 eV, and O−C=O at 289.2 eV, which indicates N atoms successfully doped in the VB 12 derived materials ( Supplementary Fig. 11a) 25 . The high-resolution O1s spectrum shows the existence of carbon atoms bonded with oxygen atoms ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Aerobic oxidative cleavage of 1,2-diols catalyzed by atomic-scale cobalt-based heterogeneous catalyst

et al. 2019

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The oxidative cleavage of the CC bonds in 1,2-diols is an important transformation in synthetic organic chemistry. The challenge for this reaction is to develop a recyclable catalyst and an efficient catalytic system that operates under mild conditions. Here we report an atomically dispersed cobalt (3.8 wt% Co) on N-doped carbon catalyst, which exhibits improved catalytic activity toward the oxidative cleavage of a variety of 1,2-diols into esters, ketones or aldehydes using molecular oxygen under mild conditions. For example, the oxidative cleavage of internal diols is achieved at ambient temperature and air pressure. The robust catalyst can be reused at least seven times without regeneration treatment. The formation of highly dispersed active CoN x sites is demonstrated by catalyst characterization and potassium thiocyanate poisoning experiment. Mechanistic insights into monosubstituted diols indicate a sequence reaction including stepwise oxidation/nucleophilic addition/C-C bond cleavage, and reveal two reaction pathways.

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Section: Resultsmentioning

confidence: 99%

Aerobic oxidative cleavage of 1,2-diols catalyzed by atomic-scale cobalt-based heterogeneous catalyst

et al. 2019

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“…But, comparing M-Co-N-C-6 and M-Co-N-C-9, the content of Co and N increased significantly (35 and 33%), which may be because that the carbon layer was destroyed when the etching time over 6 h and large numbers of Co, N were exposed. As literatures illustrated, the element of N, acting as ligands, and metal ions may form the complex Co-N x , generated excellent catalytic performance for the reaction (Puello-Polo and Brito, 2007; Datsyuk et al, 2008; Wei et al, 2015; Chen et al, 2017). The content of Co-N progressively increased with the etching time increasing from 0 to 9 h, but the content of Co-O reduced.…”

Section: Resultsmentioning

confidence: 99%

The Co-N-C Catalyst Synthesized With a Hard-Template and Etching Method to Achieve Well-Dispersed Active Sites for Ethylbenzene Oxidation

et al. 2019

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Biomass obtained from organic residues gradually becomes one of the optimal renewable feedstock of value added chemicals. Herein, the Co-N-C catalyst was prepared via a hard-template and etching method using the casein as C and N sources, magnesium oxide as the template, and cobalt porphyrin as the metal precursor. The obtained Co-N-C catalyst exhibited excellent catalytic performance for selective oxidation of ethylbenzene with a conversion rate of 96.5% under mild conditions. Moreover, the catalysts were investigated by techniques such as BET, XRD, Raman, transmission electron microscopic (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the etching progress could improve the dispersion of Co and the exposure of active sites. Herein, the efficient oxidation of ethylbenzene was attributed to the well-dispersed Co-N species and the increased specific surface area.

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“…The XPS survey was corrected by the C 1s peak fixed at 284.8 eV. As shown in Figure 4a, a high-resolution C 1s peak is deconvoluted into C-C (284.8 eV), C-N (286.0 eV) and C-C=O bonds (289.8 eV), indicating that the sample contains nitrogen-doped carbon and graphite carbon [21].The corresponding N 1s peak can be deconvoluted into four peaks at 398.4 eV, 399.7 eV, 401.1 eV and 405.5 eV, corresponding to pyridine N, pyrrole N, graphite N and oxide N, respectively, among which pyrrole N and pyridine N are essential for the electrocatalytic activity of HER by interacting with H + [16,21]. As shown in Figure 4d, Co 2p peak is deconvoluted and integrated into three pairs of peaks, among which the characteristic peaks at the binding energy of 778.4 eV and 789.1 eV are assigned to Co 0 , indicating the existence of metallic cobalt.…”

Section: Materials Characterizationmentioning

confidence: 99%

PtNi Alloy Coated in Porous Nitrogen-Doped Carbon as Highly Efficient Catalysts for Hydrogen Evolution Reactions

Song

Wang

et al. 2022

Molecules

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The development of low platinum loading hydrogen evolution reaction (HER) catalysts with high activity and stability is of great significance to the practical application of hydrogen energy. This paper reports a simple method to synthesize a highly efficient HER catalyst through coating a highly dispersed PtNi alloy on porous nitrogen-doped carbon (MNC) derived from the zeolite imidazolate skeleton. The catalyst is characterized and analyzed by physical characterization methods, such as XRD, SEM, TEM, BET, XPS, and LSV, EIS, it, v-t, etc. The optimized sample exhibits an overpotential of only 26 mV at a current density of 10 mA cm−2, outperforming commercial 20 wt% Pt/C (33 mV). The synthesized catalyst shows a relatively fast HER kinetics as evidenced by the small Tafel slope of 21.5 mV dec−1 due to the small charge transfer resistance, the alloying effect between Pt and Ni, and the interaction between PtNi alloy and carrier.

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Active and efficient Co-N/C catalysts derived from cobalt porphyrin for selective oxidation of alkylaromatics

Cited by 58 publications

References 48 publications

Aerobic oxidative cleavage of 1,2-diols catalyzed by atomic-scale cobalt-based heterogeneous catalyst

Aerobic oxidative cleavage of 1,2-diols catalyzed by atomic-scale cobalt-based heterogeneous catalyst

The Co-N-C Catalyst Synthesized With a Hard-Template and Etching Method to Achieve Well-Dispersed Active Sites for Ethylbenzene Oxidation

PtNi Alloy Coated in Porous Nitrogen-Doped Carbon as Highly Efficient Catalysts for Hydrogen Evolution Reactions

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