A novel route of enhancing oxidative catalytic activity: hydroxylation of MWCNTs induced by sectional defects

Rao, R. Prasada; Yang, Ming; Ling, Qiang; Li, Changshun; Zhang, Qingyun; Yang, Hongxiao; Zhang, Aimin

doi:10.1039/c3cy00582h

Cited by 29 publications

(33 citation statements)

References 37 publications

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“…This approach presents a facile strategy for producing surface defects and O,N-doping of carbon nanotubes simultaneously through the explosive decomposition of melamine nitrate. However, current efforts have been mainly focused on carbon catalyzed oxidative dehydrogenation, [14][15][16][17][18][19][20][21][22][23][24][25] and so far, reports on oxygen-and steam-free DDH are rare. Direct dehydrogenation (DDH) of ethylbenzene has attracted considerable attention owing to the growing demand for styrene in the chemical industry.…”

mentioning

confidence: 99%

Facile simultaneous defect production and O,N-doping of carbon nanotubes with unexpected catalytic performance for clean and energy-saving production of styrene

Zhao

Dai

et al. 2015

Green Chem.

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O,N-doped carbon nanotubes with increased structural defects and enriched surface ketonic CvO groups (MN-CNT), prepared by a facile and low-cost one-step strategy, demonstrate unexpected catalytic performance in direct dehydrogenation of ethylbenzene for styrene production with clean and energy-saving features. This work paves a new avenue for preparing other highly-efficient carbocatalysts in diverse organic transformations.

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mentioning

confidence: 99%

Facile simultaneous defect production and O,N-doping of carbon nanotubes with unexpected catalytic performance for clean and energy-saving production of styrene

Zhao

Dai

et al. 2015

Green Chem.

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“…[1][2][3][4][5][6] Carbon nanotubes, as one of the typical and commercially available nanocarbon materials, have been generally used as a support to fabricate supported metals and their derivatives catalysts for diverse reactions. [13][14][15][16][17][18][19][20][21] However, reports on the direct dehydrogenation are rare. Once their catalysis has been significantly improved, carbon nanotubes could become a huge potential carbocatalyst for diverse organic transformation reactions.…”

mentioning

confidence: 99%

Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Zhao

Dai

et al. 2015

Phys. Chem. Chem. Phys.

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A novel and efficient nitrogen-doped carbon nanotube (A-M-CNT) catalyst has been prepared by a facile two-step method, including prior air activation and subsequent pyrolysis of the carbon nanotubes with melamine. The as-synthesized A-M-CNT affords superior catalytic activity to the nitrogen-doped CNT without air activation (M-CNT) and pristine CNT, ascribed to its unique microstructure and surface chemical properties.

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“…Peaks at around 2927 and 2625 cm −1 are assigned to the O-H and CH 3 stretching vibrations [61], respectively. The prominent band at 2381 cm −1 is assigned to the characteristic absorbance of CO 2 groups [62], while peaks at 1763, 1567 and 1030 cm −1 are assigned to stretching vibrations of C=O, C=N and C-O functional groups, respectively [63]. The peaks at 1375 cm −1 are assigned to stretching vibrations of C-NH 3 [64].…”

Section: Thermal Studiesmentioning

confidence: 99%

Effect of benzophenone on the physicochemical properties of N-CNTs synthesized from 1-ferrocenylmethyl (2-methylimidazole) catalyst

Labulo

Adesuji

Oseghale

et al. 2020

J. Nig. Soc. Phys. Sci.

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Vertically-aligned nitrogen-doped carbon nanotubes (v-N-CNTs) were synthesized \textit{via} the chemical vapour deposition (CVD) technique. 1-ferrocenylmethyl(2-methylimidazole) was employed as the source of the Fe catalyst and was dissolved in different ratios of acetonitrile/benzophenone feedstock which served as both the carbon, nitrogen, and oxygen sources. The morphological difference in N-CNTs was as a result of increased oxygen concentration in the reaction mix and not due to water vapour formation as observed in the oxygen-free experiment, indicating specifically, the impact of oxygen. Raman and X-ray photoelectron spectroscopy (XPS) revealed surface defects and grafting of oxygen functional groups on the sidewall of N-CNTs. The FTIR data showed little or no effect as oxygen concentration increases. XPS analysis detected the type of nitrogen species (\textit{i.e.} pyridinic, pyrrolic, graphitic, or molecular nitrogen forms) incorporated in the N-CNT samples. Pyrrolic nitrogen was dominant and increased (from 8.6 to 11.8 at.\%) as oxygen concentration increases in the reaction precursor. An increase in N content was observed with the introduction of a lower concentration of oxygen, followed by a gradual decrease at higher oxygen concentration. Our result suggested that effective control of the reactant mixtures can manipulate the morphology of N-CNTs.

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A novel route of enhancing oxidative catalytic activity: hydroxylation of MWCNTs induced by sectional defects

Cited by 29 publications

References 37 publications

Facile simultaneous defect production and O,N-doping of carbon nanotubes with unexpected catalytic performance for clean and energy-saving production of styrene

Facile simultaneous defect production and O,N-doping of carbon nanotubes with unexpected catalytic performance for clean and energy-saving production of styrene

Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Effect of benzophenone on the physicochemical properties of N-CNTs synthesized from 1-ferrocenylmethyl (2-methylimidazole) catalyst

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