The Evaluation of Activation Energies Using a Rising Temperature Flow Reactor. The Dehydrogenation of Cyclohexane over WS2, Pt/Al2O3, Cr2O3/Al2O3, NiWO4/Al2O3 and Cr2O3

Bridges, Joanne M.; Houghton, G.

doi:10.1021/ja01515a018

Cited by 15 publications

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“…Platinum- and vanadia-based catalysts are well studied and among the most efficient for cyclohexane dehydrogenation. − A number of other materials include metal-doped zeolites and metal phosphates. − In recent years, gold nanoparticles supported on metal oxides have been shown to be attractive catalysts in a number of selective oxidation and hydrogenation reactions. , Their potential for oxidative dehydrogenation was pointed out by Bond as early as 1972 . More recently, the Hutchings group has reported that metal oxide-supported Au–Pd alloys are highly selective catalysts for the formation of benzene from cyclohexane and cyclohexene, and Vajda and co-workers reported nanometer and subnanometer cobalt oxide catalysts for the same reaction. − Gold supported on various oxide supports, including iron oxide, has also been studied for the oxidative dehydrogenation of ethane, propane, 1-butene and α,ω-diols. − …”

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confidence: 99%

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals

Goergen

Yin²,

Yang

et al. 2013

ACS Catal.

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Shape-controlled nanoscale FeO x and Au/Fe 3 O 4 catalysts with an inverse spinel structure were prepared and tested for the oxidative dehydrogenation of cyclohexane. The reaction was studied in situ in SAXS/ TPRx mode with isothermal steady-state holds. {111}-Bound Fe 3 O 4 nanooctahedra are highly stable under reaction conditions at 300 °C, but {100}-bound nanocubes begin to agglomerate above 250 °C. The selectivity to cyclohexene and benzene over CO 2 depends strongly on the iron oxide shape and its interaction with the gold. When gold is added onto the iron oxide, the formation of benzene over cyclohexene is favored over both shapes. The highest benzene yield was measured on the Au/Fe 3 O 4 octahedra. A parallel study of a commercial polycrystalline Au/Fe 2 O 3 powder was conducted, and the activity and selectivity of this catalyst were compared with the nanoshapes. After leaching of the gold with a sodium cyanide solution and heat treatment, the atomically dispersed gold on the iron oxide surface selectively catalyzed the ODH of cyclohexane to benzene. Stabilization of cationic gold was found by in situ XANES conducted during the ODH reaction.

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Section: Introductionmentioning

confidence: 99%

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals

Goergen

Yin²,

Yang

et al. 2013

ACS Catal.

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Catalyst decay in the kinetics of methylcyclohexane dehydrogenation over Pt‐NaY zeolite

1979

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The kinetics of the dehydrogenation of methylcyclohexane to toluene over platinum on NaY zeolite have been studied at 390°C and atmospheric pressure. Cumulative conversion data obtained at constant space velocity and various reaction times on stream was treated using the “Time on Stream” theory. In this way the rate constants for both dehydrogenation and catalyst decay have been determined. The reaction has been shown to occur via a series of consecutive partial dehydrogenations, with the first dehydrogenation as the rate controlling step. The influence of the partially dehydrogenated products as well as the influence of the toluene, on the deactivation of the catalyst is discussed.

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Kinetics of the vapour‐phase dehydrogenation of cyclohexane over palladium catalyst in a continuous stirred tank reactor

1972

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The catalytic vapour-phase dehydrogenation of cyclohexane has been investigated over a surface coated palladium catalyst in a continuous stirred tank reactor between 482 and 644 O F and at different partial pressures (0 to 2 atm) of cyclohexane. The rate data obtained have been analysed by the Hougen-Watson method. Non-linear least squares analyses combined with other statistical considerations were used to discriminate among rival models. The following Hougen-Watson type rate equation has been proposedThe constants in the rate equation have been expressed as functions of temperature.

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The Evaluation of Activation Energies Using a Rising Temperature Flow Reactor. The Dehydrogenation of Cyclohexane over WS₂, Pt/Al₂O₃, Cr₂O₃/Al₂O₃, NiWO₄/Al₂O₃ and Cr₂O₃

Cited by 15 publications

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Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals

Catalyst decay in the kinetics of methylcyclohexane dehydrogenation over Pt‐NaY zeolite

Kinetics of the vapour‐phase dehydrogenation of cyclohexane over palladium catalyst in a continuous stirred tank reactor

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The Evaluation of Activation Energies Using a Rising Temperature Flow Reactor. The Dehydrogenation of Cyclohexane over WS2, Pt/Al2O3, Cr2O3/Al2O3, NiWO4/Al2O3 and Cr2O3

Cited by 15 publications

References 0 publications

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeOx and Au/Fe3O4 Nanocrystals

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeOx and Au/Fe3O4 Nanocrystals

Catalyst decay in the kinetics of methylcyclohexane dehydrogenation over Pt‐NaY zeolite

Kinetics of the vapour‐phase dehydrogenation of cyclohexane over palladium catalyst in a continuous stirred tank reactor

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The Evaluation of Activation Energies Using a Rising Temperature Flow Reactor. The Dehydrogenation of Cyclohexane over WS₂, Pt/Al₂O₃, Cr₂O₃/Al₂O₃, NiWO₄/Al₂O₃ and Cr₂O₃

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals

Structure Sensitivity of Oxidative Dehydrogenation of Cyclohexane over FeO_x and Au/Fe₃O₄ Nanocrystals