Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Rangel, María do Carmo; Monteiro, Ana Paula de Melo; Oportus, Marcelo; Reyes, Patricio; Ramos, Márcia de Souza; Lima, Sirlene Barbosa

doi:10.5772/33255

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…In fact, basic oxides have been favored for CO 2 -PDH reaction due to the acidic nature of CO 2 . However, the alkali and alkaline earth oxides are inefficient because they form carbonate species in the presence of carbon dioxide (Rangel et al, 2012). Metal oxides of moderate basicity are required and must participate in the redox process with the reduction of carbon dioxide (Krylov et al, 1995).…”

Section: Coke Formationmentioning

confidence: 99%

Thermodynamic Equilibrium Analysis of Propane Dehydrogenation with Carbon Dioxide and Side Reactions

Zangeneh

Taeb

Gholivand

et al. 2015

Chemical Engineering Communications

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A thermodynamic analysis of propane dehydrogenation with carbon dioxide was performed using constrained Gibbs free energy minimization method. Different reaction networks corresponding to different catalytic systems, including non-redox and redox oxide catalysts, were simulated. The influences of CO 2 /C 3 H 8 molar ratio (1-10), temperature (700-1000 K) and pressure (0.5-5 bar) on equilibrium conversion and product composition were studied. In the presence of CO 2 with a molar ratio of CO 2 /C 3 H 8 =1, the temperature of dehydrogenation can be 30 K lower than that of dehydrogenation in the presence of steam (H 2 O/C 3 H 8 =1) and about 50 K lower than that of simple dehydrogenation without dilution to achieve 60% propane conversion. It was found that the occurrence of dry reforming of propane and coke forming side reactions could strongly impact the equilibrium product composition of the multi-reaction system and, therefore, these reactions should be kinetically controlled. Comparison of the simulated reactant conversions with those reported in the literatures revealed that the experimental conversion levels of propane are far below the corresponding equilibrium values due to rapid catalyst deactivation by coke implying that research efforts should be directed towards formulation of more active and selective catalysts. Downloaded by [University of Otago] at 21:19 12 July 2015 2

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Section: Coke Formationmentioning

confidence: 99%

Thermodynamic Equilibrium Analysis of Propane Dehydrogenation with Carbon Dioxide and Side Reactions

Zangeneh

Taeb

Gholivand

et al. 2015

Chemical Engineering Communications

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CO2 as an Oxidant for High-Temperature Reactions

Kawi

Kathiraser

2015

Front. Energy Res.

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This paper presents a review on the developments in catalyst technology for the reactions utilizing CO 2 for high-temperature applications. These include dehydrogenation of alkanes to olefins, the dehydrogenation of ethylbenzene to styrene, and finally CO 2 reforming of hydrocarbon feedstock (i.e., methane) and alcohols. Aspects on the various reaction pathways are also highlighted. The literature on the role of promoters and catalyst development is critically evaluated. Most of the reactions discussed in this review are exploited in industries and related to on-going processes, thus providing extensive data from literature. However, some reactions, such as CO 2 reforming of ethanol and glycerol, which have not reached industrial scale, are also reviewed owing to their great potential in terms of sustainability, which is essential as energy for the future. This review further illustrates the building-up of knowledge that shows the role of support and catalysts for each reaction and the underlying linkage between certain catalysts, which can be adapted for the multiple CO 2 -related reactions.

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Effect of Dopants on the Properties of Zirconia‐Supported Iron Catalysts for Ethylbenzene Dehydrogenation with Carbon Dioxide

Rangel¹,

Lima²,

SantanaBorges³

et al. 2016

Greenhouse Gases - Selected Case Studies

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Due to the harmful effects of carbon dioxide to the environment, a lot of work has been carried out aiming to find new applications, which can decrease the emissions or to capture and use it. An attractive application for carbon dioxide is the synthesis of chemicals, especially for producing styrene by ethylbenzene dehydrogenation, in which it increases the catalyst activity and selectivity. In order to find efficient catalysts for the reaction, the effect of cerium, chromium, aluminum, and lanthanum on the properties of zirconia-supported iron oxides was studied in this work. The modified supports were prepared by precipitation and impregnated with iron nitrate. The obtained catalysts were characterized by thermogravimetry, Fourier transform infrared spectroscopy, Xray diffraction, specific surface area measurement, and temperature-programmed reduction. The catalysts showed different textural and catalytic properties, which were associated to the different phases in the solids, such as monoclinic or tetragonal zirconia, hematite, maghemite, cubic ceria, monoclinic or hexagonal lantana, and rhombohedral chromia, the active phases in ethylbenzene dehydrogenation. The most promising dopant was cerium, which produces the most active catalyst at the lowest temperature, probably due to its ability of providing lattice oxygen, which activates carbon dioxide and increases the reaction rate.

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Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Cited by 3 publications

References 52 publications

Thermodynamic Equilibrium Analysis of Propane Dehydrogenation with Carbon Dioxide and Side Reactions

Thermodynamic Equilibrium Analysis of Propane Dehydrogenation with Carbon Dioxide and Side Reactions

CO2 as an Oxidant for High-Temperature Reactions

Effect of Dopants on the Properties of Zirconia‐Supported Iron Catalysts for Ethylbenzene Dehydrogenation with Carbon Dioxide

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