The Catalytic Use of Onion-Like Carbon Materials for Styrene Synthesis by Oxidative Dehydrogenation of Ethylbenzene

Keller, Nicolas; Maksimova, Nadezhda I.; Roddatis, Vladimir; Schur, Michael; Mestl, Gerhard; Butenko, Yurii V.; Кузнецов, Владимир Л.; Schlögl, Robert

doi:10.1002/1521-3773(20020603)41:11<1885::aid-anie1885>3.0.co;2-5

Cited by 255 publications

(148 citation statements)

References 10 publications

Supporting

Mentioning

141

Contrasting

Unclassified

Order By: Relevance

“…A weak shoulder at ~1190 cm −1 and two peaks at ~1340 cm −1 and ~1580 cm −1 were observed for all fibers. A broad peak around 1150 -1200 cm −1 is associated with functional groups such as C=O [20]. Thus, a shoulder at ~1200 cm −1 observed for all fibers can be inferred as functional groups obtained during stabilization.…”

Section: Tensile Properties Of Stabilized Pan Fiberssupporting

confidence: 69%

Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

Lee¹,

Kim²,

Ku³

et al. 2012

ACES

192

View full text Add to dashboard Cite

The effect of structural evolution polyacrylonitrile (PAN) on mechanical properties was investigated in stabilization and carbonization. PAN spun fibers were stabilized in a convection oven with a constant tension for various times at 250˚C. Fourier Transform Infrared spectroscopy (FTIR) and gel fraction results suggested that intra and intermolecular stabilization reactions occurred simultaneously. X-ray diffractograms revealed a disruption of crystalline structure and an appearance of pre-graphitic structure of PAN fibers due to stabilization. These structural changes by stabilization resulted in the significant decrease of tensile properties of fibers. In Raman spectra with heat treated fibers from 400˚C up to 1200˚C, the intensity ratio of the D to G bands (I D /I G ) decreased as heat treatment temperature increased, indicating an increase of basal plane of graphitic layer of heat treated fibers. Tensile strength of heat treated fibers at 1200˚C was found to be as high as 2.2 GPa.

show abstract

Section: Tensile Properties Of Stabilized Pan Fiberssupporting

confidence: 69%

Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

Lee¹,

Kim²,

Ku³

et al. 2012

ACES

192

View full text Add to dashboard Cite

show abstract

“…We have presented strong evidence that it can be ascribed to carbonaceous deposits. It is well known that certain forms of carbon are active catalysts in oxidative dehydrogenation of EB [28,29]. If no oxygen is added and after reduction of the substrate, the only source of oxygen is the water which may supply oxygen according to the dissociation equilibrium at the reaction temperature or to the coal gasification reaction which may supply CO. Post-reaction Auger analysis also revealed oxygen at the surface in this case.…”

Section: Unpromoted Model Catalystsmentioning

confidence: 84%

Styrene synthesis: in situ characterization and reactivity studies of unpromoted and potassium-promoted iron oxide model catalysts

Shekhah

Ranke

Schlögl

2004

Journal of Catalysis

View full text Add to dashboard Cite

Abstract:Styrene synthesis over iron oxide model catalysts was studied by combining UHV characterization methods with in-situ conversion measurements in a micro-flow reactor under realistic reaction conditions. Both unpromoted Fe 2 O 3 and K-promoted model catalysts show a similar high starting activity while that of Fe 3 O 4 is clearly lower. Water limits and Kpromotion slows down deactivation by coking and oxide reduction. The deactivation can be prevented and the high initial yield preserved by adding a small amount of oxygen to the feed. Both the presence of Fe 3+ and intermediate adsorption strength for ethylbenzene and styrene are essential for high conversion yields.

show abstract

“…More specifically, it has been shown by the group of Schlogl that carbon nanomaterials are very active catalyst materials in the oxidative dehydrogenation of ethylbenzene to styrene [14,15]. This observation is further supported by our own findings that with a Cr/ Al 2 O 3 catalyst, a maximum in propene yield during a propane dehydrogenation cycle is achieved after about 20 min-on-stream [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

et al. 2005

View full text Add to dashboard Cite

A Cr/Al 2 O 3 alkane dehydrogenation catalyst exhibits a maximum in ethylene yield during an ethane dehydrogenation cycle. Isotopic labelling experiments with monolabelled 13 C-ethane and deuterium were used to elucidate whether the initial activity increase could be due to formation of an active, larger hydrocarbon intermediate on the surface. The results strongly indicate that this is not the case, and instead point to a traditional reaction cycle involving adsorption of ethane to form an ethyl species, followed by desorption of ethene and hydrogen. Transient kinetic data suggest that ethane adsorption is the rate-determining step of reaction.

show abstract

The Catalytic Use of Onion-Like Carbon Materials for Styrene Synthesis by Oxidative Dehydrogenation of Ethylbenzene

Cited by 255 publications

References 10 publications

Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

Styrene synthesis: in situ characterization and reactivity studies of unpromoted and potassium-promoted iron oxide model catalysts

Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

Contact Info

Product

Resources

About