Oxidative dehydrogenation of ethylbenzene with carbon dioxide

Sugino, Mitsu-o; Shimada, Hiroshi; Turuda, Tadatoshi; Miura, Hidetoshi; Ikenaga, Naoki; Suzuki, Toshimitsu

doi:10.1016/0926-860x(95)85015-5

Cited by 158 publications

(109 citation statements)

References 25 publications

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“…Coke is a major by-product which causes catalyst deactivation, although it can also act as the active species in oxidative dehydrogenation of ethylbenzene (ODH) 4,5 and of light alkanes 6,7 as well as in the direct dehydrogenation of n-butane 8 . Indeed carbon-based catalysts are widely employed in literature studies of ethylbenzene ODH [9][10][11] . In the present work, CrO x /Al 2 O 3 is used as the catalyst for ethylbenzene dehydrogenation;…”

Section: Introductionmentioning

confidence: 99%

A new perspective on catalytic dehydrogenation of ethylbenzene: the influence of side-reactions on catalytic performance

Sanz

McMillan

McGregor

et al. 2015

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. Takedown AbstractThe dehydrogenation of ethylbenzene to styrene is a highly important industrial reaction and the focus of significant research in order to optimise the selectivity to styrene and minimise catalyst deactivation. The reaction itself is a complex network of parallel and consecutive processes including cracking, steam-reforming and reverse water-gas shift (RWGS) in addition to dehydrogenation. The goal of this investigation is to decouple the major processes occurring and analyse how side-reactions affect both the equilibrium of ethylbenzene dehydrogenation and the surface chemistry of steam reforming activity over the reduced catalyst; and reverse water-gas shift reaction. Each of these processes plays a critical role in the observed catalytic activity.Notably, the presence of CO 2 evolved from the reduction of chromium by ethylbenzene and from the gasification of the deposited oxygen-functionalised coke results in the dehydrogenation reaction becoming partially oxidative, i.e. selectivity to styrene is enhanced by coupling of ethylbenzene dehydrogenation with the reverse water-gas shift reaction. Ethylbenzene cracking, coke gasification, steam-reforming and reverse water-gas-shift determine the relative quantities of CO 2 , CO, H 2 and H 2 O and hence affect the coupling of the reactions. Coke deposition during the cracking period lowers the catalyst acidity and may contribute to chromium reduction, hence diminishing the competition between acid and metal sites and favouring dehydrogenation activity.

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Section: Introductionmentioning

confidence: 99%

A new perspective on catalytic dehydrogenation of ethylbenzene: the influence of side-reactions on catalytic performance

Sanz

McMillan

McGregor

et al. 2015

Catal. Sci. Technol.

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“…Hydrogen can be recovered by the reaction of the formed CO with steam via water gas shift reaction (WGSR). Thus, CO 2 is considered as a promising soft oxidant to replace steam [4][5][6][7]. CO 2 has an advantage over steam in the form of equilibrium alleviation due to coupling of dehydrogenation reaction with RWGSR which increases the ST yield and also requires lower CO 2 consumption when compared to steam [8].…”

Section: Introductionmentioning

confidence: 99%

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

et al. 2016

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The present work highlights the influence of ceria over vanadia/alumina for the oxidative dehydrogenation of ethylbenzene to styrene with CO 2 as a soft oxidant. Various weight loadings (0, 3, 5, and 7 %) of ceria were incorporated into 10wt % V 2 O 5 /Al 2 O 3 catalyst by wet impregnation process. Structural and textural characterizations of the catalysts were performed by means of powder X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of CO 2 , N 2 adsorption-desorption analysis. Over 10 % V 2 O 5 /Al 2 O 3 , ethylbenzene conversion decreases from 62 to 49 % in a spam of 12 h. Ceria-incorporated catalyst (3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 ) showed steady ethylbenzene conversion of nearly 65 % with a styrene selectivity of 96 % for a period of 12 h time. Improved catalytic activity observed on this catalyst can be attributed to the increase in the number of redox/active VO x species after incorporation of ceria. The redox properties of 3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 and 10wt % V 2 O 5 /Al 2 O 3 were examined by reaction of CO 2 in pulses on to the partially reduced catalysts. The spent catalysts were characterized using XRD & TPR analysis to assess the reason for the deactivation of catalysts.

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“…A lot of reports are available on EB dehydrogenation reaction in the presence of CO 2 over a variety of catalysts, such as iron oxide [3], vanadium oxide [4,5], TiO 2 -ZrO 2 mixed oxide [6,7], hydrotalcite-like oxide [8,9], spinel oxide [10][11][12][13], and Fecontaining ceramic composites [14]. Among these, spinel oxides containing iron species as catalysts for EB dehydrogenation have been screened extensively due to the benefits in preventing the deactivation process and increasing the activity of dehydrogenation of EB in the presence of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

Zhang

Wang

et al. 2013

Journal of Molecular Catalysis A: Chemical

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Oxidative dehydrogenation of ethylbenzene with carbon dioxide

Cited by 158 publications

References 25 publications

A new perspective on catalytic dehydrogenation of ethylbenzene: the influence of side-reactions on catalytic performance

A new perspective on catalytic dehydrogenation of ethylbenzene: the influence of side-reactions on catalytic performance

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

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