ChemInform Abstract: The Nature of the Iron Oxide‐Based Catalyst for Dehydrogenation of Ethylbenzene to Styrene. Part 1. Solid‐State Chemistry and Bulk Characterization

Schuetze, J.; Wesemann, Michael; Rayment, Trevor; Dent, Andrew J.; Schloegl, Robert; Ertl, G.

doi:10.1002/chin.199112103

Cited by 18 publications

(29 citation statements)

References 1 publication

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“…Ethylbenzene (EB) dehydrogenation as a representative process for the production of styrene is performed on the promoted iron oxide catalysts in the presence of a large quantity of steam at high temperatures of 600-700°C [1][2][3][4][5]. Since the current process is equilibrium limited and high energy consuming, there is a strong incentive for the development of new process and catalysts [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Xiang

et al. 2008

Catal Lett

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Nanocrystalline alumina was prepared and was employed as a support for vanadium catalysts. The catalysts were characterized by N 2 adsorption/desorption, X-ray diffraction, TPR, UV-Vis, NH 3 -TPD, and CO 2 -TPSR. The activity and selectivity of the catalysts in ethylbenzene dehydrogenation in the presence of CO 2 were compared with vanadium supported on commercial available alumina. The catalytic activity, selectivity, and stability were enhanced by the use of nanocrystalline alumina as catalyst supports. The superior performance of the present nano-crystalline alumina catalysts was attributed to the higher surface areas, higher vanadium dispersion, and higher stability of V 5+ against reduction.

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Section: Introductionmentioning

confidence: 99%

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Xiang

et al. 2008

Catal Lett

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“…We have previously reported XPS and XRD studies in which we have shown that KFeO 2 is present under the reaction conditions and is active for the reaction [7]. Addiego et al [8], Hirano [9], and Muhler and co-workers [10][11][12][13][14] have also concluded that KFeO 2 is the active species. However, the nature of the active sites remains unclear.…”

Section: Introductionmentioning

confidence: 89%

Kinetic study on the influence of CO2 on the dehydrogenation of ethylbenzene to styrene

Kano

Ohshima

Kurokawa

et al. 2010

Reac Kinet Mech Cat

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Dehydrogenation of ethylbenzene (EB) was examined in the presence of CO 2 , and the effect of CO 2 on Fe 2 O 3 , Fe-Ce, Fe-K, and Fe-Ce-K oxide catalysts was evaluated. The rate equation was derived in relation to the LangmuirHinshelwood mechanism. The rate constant (k) and the relative adsorption coefficient (Z CO 2 ) were obtained, and it was found that addition of K in the catalyst increased both k and Z CO 2 : We found that CO 2 had a strong affinity for the catalyst surface and that the active sites were basic.

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“…The methods of analysis follow those described previously 33 . Table 4 shows the number and distribution of acid sites, as determined by NH 3 -TPD, for fresh sites (250-400 °C) and high energy acid sites (>400 °C) 46 . A higher percentage of low and high energy acid sites are poisoned after benzene pre-coking as compared to medium strength acid sites.…”

Section: Ethylbenzene Dehydrogenation Over Pre-coked Catalystsmentioning

confidence: 99%

The enhancement of the catalytic performance of CrO_x/Al₂O₃ catalysts for ethylbenzene dehydrogenation through tailored coke deposition

Sanz

McMillan

McGregor

et al. 2016

Catal. Sci. Technol.

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eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. catalysts proceeds sequentially via cracking and then dehydrogenation reactions. The present work reports how tailored coke deposition on the catalyst surface can suppress undesired reactions such as cracking to benzene and coke during ethylbenzene dehydrogenation. Additionally, this approach also provides insights into the precursor molecules involved in the formation of carbonaceous deposits, hence providing further understanding of coke formation. Pre-coked catalysts were prepared by adsorbing the products of the ethylbenzene reaction (i.e, benzene, toluene, styrene, ethylene) as single components, in a flowing system at 600 °C over the fresh catalyst. The resulting precoked catalysts were then evaluated in the ethylbenzene dehydrogenation reaction and their performance compared with that of the catalyst without exposure to pre-treatment.Characterisation of pre-coked catalysts by elemental analysis, temperature-programmed oxidation (TPO), temperature-programmed desorption (TPD), Raman spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) indicated that ethylene is the main coke precursor during ethylbenzene dehydrogenation and that ethylene-derived coke is associated with a reduction in selectivity to styrene as compared to the fresh catalyst. Coke deposited after pre-coking with aromatic molecules, and in particular with benzene, was beneficial for dehydrogenation activity, as shown by the increase in styrene selectivity relative to the fresh catalyst. This enhancement of dehydrogenation activity was correlated with deactivation of acid sites and the reduction of chromium from Cr(VI) to Cr(III) (active species for dehydrogenation) as a result of the pre-coking procedure.

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ChemInform Abstract: The Nature of the Iron Oxide‐Based Catalyst for Dehydrogenation of Ethylbenzene to Styrene. Part 1. Solid‐State Chemistry and Bulk Characterization

Cited by 18 publications

References 1 publication

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Kinetic study on the influence of CO2 on the dehydrogenation of ethylbenzene to styrene

The enhancement of the catalytic performance of CrO_x/Al₂O₃ catalysts for ethylbenzene dehydrogenation through tailored coke deposition

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ChemInform Abstract: The Nature of the Iron Oxide‐Based Catalyst for Dehydrogenation of Ethylbenzene to Styrene. Part 1. Solid‐State Chemistry and Bulk Characterization

Cited by 18 publications

References 1 publication

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Kinetic study on the influence of CO2 on the dehydrogenation of ethylbenzene to styrene

The enhancement of the catalytic performance of CrOx/Al2O3 catalysts for ethylbenzene dehydrogenation through tailored coke deposition

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The enhancement of the catalytic performance of CrO_x/Al₂O₃ catalysts for ethylbenzene dehydrogenation through tailored coke deposition