EELS studies of carbide derived carbons

Trabesinger, Sigita; Wachtmeister, Staffan; Mirguet, Claude; Coronel, Ernesto; Zou, Wei; Csillag, Stefan; Svensson, Gunnar

doi:10.1016/j.carbon.2007.05.022

Cited by 71 publications

(61 citation statements)

References 21 publications

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“…Besides, the higher-ordered (004) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 In agreement with results reported in literature, the fraction of sp 2 -carbon determined from the C K-edge EEL spectra ( Figure S3A) remains around 92% till 1000 °C ( Figure 2B). 27,37 Raising the synthesis temperature further, the share of sp 2 -hybridized carbon increases to extraordinary 99% for TiC-CDC-1585, which is close to the number of HOPG.…”

Section: Resultsmentioning

confidence: 91%

Mesoporous and Graphitic Carbide-Derived Carbons as Selective and Stable Catalysts for the Dehydrogenation Reaction

et al. 2015

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Dehydrogenation of ethylbenzene to styrene is one of the most important catalytic processes in chemical industry. While it was demonstrated that nanocarbons like nanotubes, nanodiamond or nanographite show high performance, especially selectivity, these powders give rise to handling problems, high pressure drop, hampered heat and mass transfer, and unclear health risks. More common macroscopic carbon materials like activated carbons show unsatisfying selectivity below 80%. In this study mesoporous, graphitic and easy to handle carbon powders were synthesized based on the reactive extraction of titanium carbide in a novel temperature regime. This resulted in extraordinary properties like a mean pore diameter of up to 8 nm, pore volumes of up to 0.90 ml g -1 and graphite crystallite sizes exceeding 25 nm. Exceptional styrene selectivities of up to 95% were observed for materials synthesized above 1300 °C and pretreated with nitric acid. Furthermore, the long-term stability of these non-nanocarbon catalysts could be demonstrated for the first time during 120 h time-on-stream.

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Section: Resultsmentioning

confidence: 91%

Mesoporous and Graphitic Carbide-Derived Carbons as Selective and Stable Catalysts for the Dehydrogenation Reaction

et al. 2015

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“…The ratio obtained according to the (4) is usually normalized to the factor determined from spectra of a 100% sp 2 -hybridized material. The most often highly oriented pyrolytic graphite (HOPG) is used [56,58]. However, an open discussion is correctness of such technique [59,60].…”

Section: Bonding Character Of Carbon Atoms At Different Stages Of Thementioning

confidence: 99%

Evolution of glassy carbon under heat treatment: correlation structure–mechanical properties

et al. 2017

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In order to accommodate an increasing demand for glassy carbon products with tailored characteristics, one has to understand the origin of their structure-related properties. In this work, through the use of high-resolution transmission electron microscopy, Raman spectroscopy, and electron energy loss spectroscopy it has been demonstrated that the structure of glassy carbon at different stages of the carbonization process resembles the curvature observed in fragments of nanotubes, fullerenes, or nanoonions. The measured nanoindentation hardness and reduced Young's modulus change as a function of the pyrolysis temperature from the range of 600-2500°C and reach maximum values for carbon pyrolyzed at around 1000°C. Essentially, the highest values of the mechanical parameters for glassy carbon manufactured at that temperature can be related to the greatest amount of non-planar sp 2 -hybridized carbon atoms involved in the formation of curved graphene-like layers. Such complex labyrinth-like structure with sp 2 -type bonding would be rigid and hard to break that explains the glassy carbon high strength and hardness.

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“…The strength of Me-C bonds decreases by going from period 4 to period 5 in the periodic table [33] , meaning that the Zr-C bonds will be more stable than Nb-C. respectively [34] . The spectrum indicates that the relative amount of sp 3 C bonds is higher in the matrix phase.…”

Section: Resultsmentioning

confidence: 99%

Model for electron-beam-induced crystallization of amorphous Me–Si–C (Me = Nb or Zr) thin films

et al. 2014

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EELS studies of carbide derived carbons

Cited by 71 publications

References 21 publications

Mesoporous and Graphitic Carbide-Derived Carbons as Selective and Stable Catalysts for the Dehydrogenation Reaction

Mesoporous and Graphitic Carbide-Derived Carbons as Selective and Stable Catalysts for the Dehydrogenation Reaction

Evolution of glassy carbon under heat treatment: correlation structure–mechanical properties

Model for electron-beam-induced crystallization of amorphous Me–Si–C (Me = Nb or Zr) thin films

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