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Download fileMesoporous and Graphitic Carbide-Derived Carbons as Selective and Stable Catalysts for the Dehydrogenation Reaction
journal contribution
posted on 2015-08-25, 00:00 authored by Jan Gläsel, Jiangyong Diao, Zhenbao Feng, Markus Hilgart, Thomas Wolker, Dang Sheng Su, Bastian J. M. EtzoldDehydrogenation
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 on the basis of 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 of
time-on-stream.
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pressure dropcarbon powdersnovel temperature regimenanographite showStable Catalystsnitric acidselectivity25 nm8 nmpore diameterExceptional styrene selectivitiesmass transferhealth riskstitanium carbidepore volumes120 hmacroscopic carbon materialsDehydrogenation ReactionDehydrogenationchemical industrygraphite crystallite sizesreactive extractionhandling problemscarbons show