Oxidative dehydrogenation of cyclohexane over modified zeolite catalysts

Aliev, A. M.; Shabanova, Z.A.; Наджаф-Кулиев, У. М.; Medzhidova, S. M.

doi:10.1134/s0965544116070021

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…The main findings are the dramatically reduced temperature in comparison with previously reported ODH catalyst for propane and cyclohexane and the suppression of CO 2 production for the lean conditions. The temperature of 100 °C, at which the ODH activity sets off, is lower than reported for propane ODH with Pt clusters (~400 °C) 8 or in the ODH of cyclohexane by various catalysts, such as VOx (~400 °C) 25 , zeolites doped with transition metals (>300 °C) 26 , copper oxide-based (~250 °C) 27 , Au/Pd-based (200 °C) 23 , or FeO x , Au/Fe 3 O 4 and Co 3 O 4 -based catalysts (~200–250 °C) 28,29 . In comparison with per exposed surface Co atom rates obtained for 6 nm Co 3 O 4 particles 29 tested under identical reaction conditions, the rate of formation of cyclohexene, cyclohexadiene, and benzene measured on the Co 4 and Co 27 clusters are higher by about a factor of 20, 100, and 1.2, respectively.…”

Section: Resultsmentioning

confidence: 63%

Subnanometer cobalt oxide clusters as selective low temperature oxidative dehydrogenation catalysts

et al. 2019

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The discovery of more efficient, economical, and selective catalysts for oxidative dehydrogenation is of immense economic importance. However, the temperatures required for this reaction are typically high, often exceeding 400 °C. Herein, we report the discovery of subnanometer sized cobalt oxide clusters for oxidative dehydrogenation of cyclohexane that are active at lower temperatures than reported catalysts, while they can also eliminate the combustion channel. These results found for the two cluster sizes suggest other subnanometer size (CoO) x clusters will also be active at low temperatures. The high activity of the cobalt clusters can be understood on the basis of density functional studies that reveal highly active under-coordinated cobalt atoms in the clusters and show that the oxidized nature of the clusters substantially decreases the binding energy of the cyclohexene species which desorb from the cluster at low temperature.

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Section: Resultsmentioning

confidence: 63%

Subnanometer cobalt oxide clusters as selective low temperature oxidative dehydrogenation catalysts

et al. 2019

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“…It has been proposed that their formation occurs by the reaction of cyclohexane with the free radical forms of adsorbed oxygen and that further oxidation happens from the oxygen from the gas phase. As a consequence deep and oxidative dehydrogenation occur, giving rise to carbon dioxide and benzene [43].…”

Section: Photocatalytic Activity Resultsmentioning

confidence: 99%

UV Light Driven Selective Oxidation of Cyclohexane in Gaseous Phase Using Mo-Functionalized Zeolites

Vaiano

Sannino

2019

Surfaces

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Heterogeneous photocatalysis in the gas phase has been applied as a promising technique for organic syntheses in mild conditions. Modified zeolites have been used under UV irradiation as novel photocatalysts. In this study, we preliminarily investigated the photoxidation of cyclohexane on ferrierite and MoOx-functionalized ferrierite in a gas–solid continuous flow reactor. In the presence of UV light, MoOx-functionalized ferrierite showed the formation of benzene and cyclohexene as reaction products, indicating the occurrence of photocatalysed cyclohexane oxydehydrogenation. By contrast, unmodified ammonium ferrierite exhibited relevant activity for total oxidation of cyclohexane to carbon dioxide and water. The influence of Mo loading on cyclohexane conversion and products selectivity was evaluated.

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“…В результате этих исследований было установлено, что катализатор CuZnCoCr-клиноптилолит, содержащий Cu 2+ -0.5%; Zn 2+ -0.2%; Co 2+ -0.1%; Cr 3+ -0.1% проявляет относительно высокую активность в рассматриваемой реакции. Были изучены кинетические закономерности протекания реакции на активном катализаторе [87]. По полученным экспериментальным данным предложена следующая кинетическая схема протекания реакции окислительного дегидрирования циклогексана на металлцеолитном катализаторе CuZnCoCr-клиноптилолит:…”

Section: таблицаunclassified

Zeolites Modified Metal Cations as Catalysts in Hydrocarbon Oxidation and the Alkyl Alcohol

Aliyev¹,

Shabanova²,

Aliyev³

et al. 2014

European Researcher

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The results of studies on the creation of highly metalltceolitnyh systems and the study of their catalytic activities in the oxidation of lower olefin hydrocarbons (ethylene to acetaldehyde, acetone, propylene, butylene methyl ethyl ketone); aliphatic C 1 -C 5 alcohols to their corresponding aldehydes, ketones, carboxylic acids and carboxylic acid esters; oxidative dehydrogenation of naphthenes in the alicyclic diene hydrocarbons and the oxidative dimerization of methane to acetylene. It has been established that the selectivity of these catalysts determined optimal combination of metal components with the acidity and the structure of the zeolite. Selected highly effective catalysts for the reactions studied. Based on the results of experimental studies of the kinetics of the reactions of oxidation of lower olefin hydrocarbons and aliphatic alcohols, the oxidative dehydrogenation of naphthenes and oxidative coupling of methane on the synthesized catalysts are represented by their probable stepwise mechanism and kinetic models developed reactions.

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Oxidative dehydrogenation of cyclohexane over modified zeolite catalysts

Cited by 7 publications

References 5 publications

Subnanometer cobalt oxide clusters as selective low temperature oxidative dehydrogenation catalysts

Subnanometer cobalt oxide clusters as selective low temperature oxidative dehydrogenation catalysts

UV Light Driven Selective Oxidation of Cyclohexane in Gaseous Phase Using Mo-Functionalized Zeolites

Zeolites Modified Metal Cations as Catalysts in Hydrocarbon Oxidation and the Alkyl Alcohol

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