Textural properties of layered double hydroxides: effect of magnesium substitution by copper or iron

Cârjă, Gabriela; Nakamura, Ryuichi; Aida, Takashi; Niiyama, Hiroo

doi:10.1016/s1387-1811(01)00387-0

Cited by 136 publications

(84 citation statements)

References 22 publications

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“…Catalytic dehydrogenation of ethylbenzene is the main industrial method to produce styrene 1,2 , which is a precursor molecule for the synthesis of rubbers and plastics. In practice, the catalytic dehydrogenation process itself is part of a complex reaction network including not only dehydrogenation but also side-reactions.…”

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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“…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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“…It is important to develop the new technology to use aluminum dross effectively [4][5][6][7][8][9] . In this study, the synthesis of hydrotalcite-like materials (HT), which have a structure of layered double hydroxides and are one of the inorganic anion exchangers [10][11][12][13][14][15] , was carried out using reagents and the wastes discharged in an aluminum recycling process as a raw material. The removal of toxic metal ions such as As(III) and As(V) was investigated using the HT and the HT calcination product.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrotalcite-Like Materials from Various Wastes in Aluminum Regeneration Process

Murayama

Shibata

Sakai

et al. 2006

Resources Processing

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Syntheses of hydrotalcite-like materials (HT), functional inorganic materials having layered structure of complex hydroxide, were carried out using aluminum dross, white dust and waste solution containing Mg in an aluminum regeneration process as a raw material. The removal of toxic anions such as As(III) and As(V) were investigated with the various HTs calcined at 673K.The CO3 2− type HT can be synthesized from the aluminum dross, white dust and MgCl2 solution by a co-precipitation method. The characteristics of HT obtained from the wastes are almost the same as that synthesized from reagents. It is possible to remove As(III) and As(V) in aqueous solution with various HT calcination products. Three stages of batch adsorption operation is suitable to remove As(III) and As(V) with the HT calcination product. The HT derived from the above wastes can be used as an excellent material for the removal of various toxic heavy metal ions.

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Textural properties of layered double hydroxides: effect of magnesium substitution by copper or iron

Cited by 136 publications

References 22 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

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

Synthesis of Hydrotalcite-Like Materials from Various Wastes in Aluminum Regeneration Process

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