Action of activated coke as a catalyst: oxydehydrogenation of ethylbenzene to styrene

Cadús, Luís E.; Arrúa, Luis A.; Gorriz, Osvaldo F.; Rivarola, J. B.

doi:10.1021/ie00084a009

Cited by 55 publications

(35 citation statements)

References 8 publications

(9 reference statements)

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“…Secondly, the coke layer alters the chemical composition of the surface [35,[40][41][42]. Those effects were previously observed in the ODH reaction over the acidic catalysts (such as SiO 2 , Al 2 O 3 ) [42,43] and various carbon materials (ACs, multiwall carbon nanotubes, OMCs) [24,37,41,44]. Figure 8 presents the conversions of ethylbenzene and selectivity to styrene calculated after 6 h time-on-stream.…”

Section: Catalytic Activity Of Cmk-1 Carbon Replicas In Oxidative Dehmentioning

confidence: 78%

“…It should be kept in mind that selectivity to CO x is inversely coupled to styrene at negligible selectivity to benzene and toluene [45]. Moreover, it was postulated that the carbonaceous deposit is created by the styrene molecules [41,43]. It might be stated that the efficiency of the coke deposition affecting the styrene selectivity, depends on the time, in which the styrene molecules stay within the pores of carbon replica.…”

Section: Catalytic Activity Of Cmk-1 Carbon Replicas In Oxidative Dehmentioning

confidence: 99%

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Oxidative Dehydrogenation of Ethylbenzene Over Poly(furfuryl alcohol)-Derived CMK-1 Carbon Replica

et al. 2016

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Poly(furfuryl alcohol) was introduced into a pore system of MCM-48 silica by the precipitation polycondensation of furfuryl alcohol (FA). The complete filling of the pores without the deposition of significant amounts of polymer on the external surface of MCM-48 was obtained at the FA/MCM-48 mass ratio close to 1.0. The final structure of carbon replica was formed by subsequent carbonization and extraction of SiO 2 with HF. The carbonization temperature strongly influenced the surface composition of the formed carbon replicas. The highest catalytic activity in the oxidative dehydrogenation of ethylbenzene was observed for CMK-1 with the highest concentration of phenol and carbonyl groups, recognized as active sites of the studied reaction.Graphical Abstract

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Section: Catalytic Activity Of Cmk-1 Carbon Replicas In Oxidative Dehmentioning

confidence: 78%

Section: Catalytic Activity Of Cmk-1 Carbon Replicas In Oxidative Dehmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethylbenzene Over Poly(furfuryl alcohol)-Derived CMK-1 Carbon Replica

et al. 2016

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“…Methane is produced mainly as a co-product of ethylbenzene hydrogenolysis into toluene and from CO methanation. Furthermore, a simultaneous release of CO and CH 4 , coupling with a decrease in styrene formation is observed (Fig. 11a,b).…”

Section: Tpr Analysis Indicates That These Temperatures Correspond Tomentioning

confidence: 84%

“…Atanda and coworkers employed a kinetic model to identify cracking as a major process that occurs simultaneously with dehydrogenation over hydrotalcite catalysts 3 , while other possible reactions can include reverse water-gas shift (RWGS), steam reforming of light hydrocarbons and the formation of hydrocarbonaceous deposits ("coke"). 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] .…”

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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“…Coke on alumina has been 14 studied as a catalyst in dehydrogenations such as the conversion of ethylbenzene to styrene. 35 The alumina promotes the formation of the coke which is the active catalyst for ethylbenzene dehydrogenation.…”

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confidence: 99%

Direct catalytic conversion of methane and light hydrocarbon gases. Quarterly report No. 9, October 1--December 31, 1988

Wilson¹,

Posin²,

Chan³

1989

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Action of activated coke as a catalyst: oxydehydrogenation of ethylbenzene to styrene

Cited by 55 publications

References 8 publications

Oxidative Dehydrogenation of Ethylbenzene Over Poly(furfuryl alcohol)-Derived CMK-1 Carbon Replica

Oxidative Dehydrogenation of Ethylbenzene Over Poly(furfuryl alcohol)-Derived CMK-1 Carbon Replica

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

Direct catalytic conversion of methane and light hydrocarbon gases. Quarterly report No. 9, October 1--December 31, 1988

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