Defects of multi-walled carbon nanotubes as active sites for benzene hydroxylation to phenol in the presence of H2O2

Song, Shaoqing; Yang, Hongxiao; Rao, R. Prasada; Liu, Huade; Zhang, Aimin

doi:10.1016/j.catcom.2010.02.015

Cited by 71 publications

(34 citation statements)

References 23 publications

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“…The highly dispersed VO x nanoparticles (NPs) were found to be highly efficient for the hydroxylation of benzene. As one of the most interesting solid materials, carbon materials (such as activated carbon, MWCNTs, and graphene) can act as catalysts by themselves [25][26][27] or serve as supports for other active phase [28][29][30][31][32]. Nowadays, the vanadium oxide/carbon composites have attracted increasing attentions.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

et al. 2016

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Abstract:The vanadium oxide/reduced graphene oxide (VO x /RGO) composites have been prepared by a simple solvothermal method with the assistance of cationic surfactant cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the resultant VO x /RGO composites have been well characterized. The VO x nanoparticles are highly dispersed on the RGO sheets with a particle size of about 25 nm. When used as hydroxylation catalysts, the VO x /RGO composites are more efficient than individual RGO and vanadium oxide catalysts. The enhanced catalytic performance may be related to not only the well dispersed VO x active species, but also the hydrophobic surface and huge π-electron system of RGO for the adsorption and activation of benzene. In addition, the effects of calcination conditions on the microstructure and catalytic properties of VO x /RGO composites have also been investigated. The uniform VO x nanoparticles on the separated RGO sheets show highly efficient catalytic performance, while the formation of aggregated H x V 2 O 5 and bulk V 2 O 5 species along with the destruction of RGO sheets are poor for the hydroxylation of benzene. Up to 17.4% yield of phenol is achieved under the optimized catalytic reaction conditions.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

et al. 2016

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“…64 All of these techniques may thus produce defects and impurities in CNTs to various degrees. [64][65][66][67] In the case of polymer matrices, defective tubes actually improve matrix/reinforcement cohesion, still enhancing the properties of the matrix. In metal matrices, the damage is critical.…”

Section: Laser Healing and Purication Of Mechanically Damaged Swcntsmentioning

confidence: 99%

In situ tracking of defect healing and purification of single-wall carbon nanotubes with laser radiation by time-resolved Raman spectroscopy

et al. 2015

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a Defects and impurities in carbon nanotubes (CNTs), inherent to all synthesis routes, are generally addressed by thermal and/or chemical post treatments. These require atmosphere control, time-consuming temperature ramping, chemical handling, and often incur further defects. Furthermore, certain applications require nanotube treatments, such as dispersion, that cause further unwanted damage. Laser radiation was found to drastically increase purity, crystallinity and mean inter-defect distance while reducing defects, as indicated by Raman spectroscopy, effectively annealing our single-wall CNTs. Laser power density and radiation times, in other words, fluence, were optimised. When applied to CNTs with mechanically induced defects, these were almost fully eliminated. In addition to the tuned annealing of CNTs, unintentional sample modification can occur during Raman measurements if the influence of the power density and the exposure time are underestimated or disregarded. Fast laser radiation times and simple manipulation outdo common purification treatments. Additionally, selective shape and sitespecific parameters come into play such as interference patterns. Such arrangements of alternating tube quality, that is, in a CNT mat, could be interesting for preferred electronic conduction paths and find applications in, for example, interdigitated electrodes or sensors.

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“…The good dispersion of metal cations into the nanotubular structures of CNTs improved the synergetic effects between the Cu-Ni alloy and the CNT's support structure that ultimately contributed to the improved catalytic activity towards the desired production of dimethyl carbonate from methanol and carbon dioxide. Song et al [117] investigated the influence of surface defect sites generated from heating and ultrasonication methods of CNT's modification on the hydroxylation reaction of benzene to phenol in the presence of H 2 O 2 . They proposed that the defective sites in the structure of MWCNTs played a key role in the significant enhancement of benzene conversion in the benzene hydroxylation reaction.…”

Section: Other Heterogeneous Cnt-supported Catalystsmentioning

confidence: 99%

Utilization of Carbon Nanotubes as a Support Material in Metal-Based Catalyst Systems: Applications in Catalysis

Pahmy¹,

Mohamed

2012

ENG

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Carbon nanotubes (CNTs), which were discovered in 199, have emerged as one of the most distinctive classes of carbon-allotrope materials. They exhibit various fascinating physical, electronic and mechanical properties, which have stimulated significant interest among researchers. CNT researchers have focused on exploring and deploying CNTs in the area of synthesis and implementing them in numerous applications, such as nanoelectronic devices, compositereinforcement material, catalyst supports, etc. Their combination of light weight, nanoscale diameter, mesoporous structure, high aspect ratio, high thermal conductivity and high stability render them as effective support materials. This review focuses on the applications of CNTs combined with various metal-based particles in the field of catalysis. The effects of the incorporation of CNTs into catalyst systems are discussed in terms of the catalytic activity, reaction selectivity and reaction pathway. The remarkable properties of CNTs that fulfil the requirements of support catalysts are also discussed. Patents relevant to the topic have been discussed.

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Defects of multi-walled carbon nanotubes as active sites for benzene hydroxylation to phenol in the presence of H2O2

Cited by 71 publications

References 23 publications

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

In situ tracking of defect healing and purification of single-wall carbon nanotubes with laser radiation by time-resolved Raman spectroscopy

Utilization of Carbon Nanotubes as a Support Material in Metal-Based Catalyst Systems: Applications in Catalysis

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