High Performance of Fe–K Oxide Catalysts for Dehydrogenation of Ethylbenzene to Styrene with an aid of ppm-order Pd

Sekine, Yasushi; Watanabe, Ryo; Matsukata, Masahiko; Kikuchi, Eiichi

doi:10.1007/s10562-008-9580-8

Cited by 23 publications

(17 citation statements)

References 8 publications

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“…An isotope exchange reaction from 16 O lat to 18 O lat in the catalyst by switching H 16 2 O flow to H 18 2 O at 783 K was conducted over the Ba 0.4 Sr 0.6 Fe 0.6 Mn 0.4 O 3 − δ catalyst. We have already found that Fe–K catalyst works on a redox mechanism during EBDH (Sekine et al, 2008 ). Figure 7 presents temporary profiles of the flow rate of H 18 2 O by the time that the stable flow rate of H 18 2 O was confirmed.…”

Section: Resultsmentioning

confidence: 92%

“…We previously investigated the reaction mechanism of EBDH with steam over the industrial potassium promoted the iron catalyst (Fe–K) catalyst, and found for the first time that oxidative dehydrogenation of EBDH (Equation 2) proceeded on the Fe–K catalyst and H 2 O can regenerate the consumed lattice oxygen in the catalyst (Equation 3) (Sekine et al, 2008 ).…”

Section: Introductionmentioning

confidence: 99%

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Lanthanoid-free perovskite oxide catalyst for dehydrogenation of ethylbenzene working with redox mechanism

et al. 2013

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For the development of highly active and robust catalysts for dehydrogenation of ethylbenzene (EBDH) to produce styrene; an important monomer for polystyrene production, perovskite-type oxides were applied to the reaction. Controlling the mobility of lattice oxygen by changing the structure of Ba1 − xSrxFeyMn1 − yO3 − δ (0 ≤ x ≤ 1, 0.2 ≤ y ≤ 0.8), perovskite catalyst showed higher activity and stability on EBDH. The optimized Ba/Sr and Fe/Mn molar ratios were 0.4/0.6 and 0.6/0.4, respectively. Comparison of the dehydrogenation activity of Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ catalyst with that of an industrial potassium promoted iron (Fe–K) catalyst revealed that the Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ catalyst showed higher initial activity than the industrial Fe–K oxide catalyst. Additionally, the Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ catalyst showed high activity and stability under severe conditions, even at temperatures as low as 783 K, or at the low steam/EB ratio of 2, while, the Fe–K catalyst showed low activity in such conditions. Comparing reduction profiles of the Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ and the Fe–K catalysts in a H2O/H2 atmosphere, reduction was suppressed by the presence of H2O over the Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ catalyst while the Fe–K catalyst was reduced. In other words, Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ catalyst had higher potential for activating the steam than the Fe–K catalyst. The lattice oxygen in perovskite-structure was consumed by H2, subsequently the consumed lattice oxygen was regenerated by H2O. So the catalytic performance of Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ was superior to that of Fe–K catalyst thanks to the high redox property of the Ba0.4Sr0.6Fe0.6Mn0.4O3 − δ perovskite oxide.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Lanthanoid-free perovskite oxide catalyst for dehydrogenation of ethylbenzene working with redox mechanism

et al. 2013

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“…When producing RM, a potassium doped iron oxide catalyst is often used. It was developed for industrial production reactions and is studied extensively due to its complexity and usefulness [34][35][36]. For these kinds of catalysts a flux of highly excited potassium Rydberg species have been proven by field ionization method, and this flux corresponded to the catalyst activity [37].…”

Section: Theory and Working Principle Of Rm Productionmentioning

confidence: 99%

A Condensed Excited (Rydberg) Matter: Perspective and Applications

Aasen

Zeiner-Gundersen

et al. 2021

J Clust Sci

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A condensed excited matter called Rydberg Matter (RM) have been studied experimentally for 30 years, but have not sparked widespread attention yet, unlike ordinary Rydberg atoms. RM formed by clusters of Rydberg atoms at a solid surface have a longer lifetime compared to Rydberg atoms, and is liquid-like. This review describes how the RM state is generated, and its potential applications. These include using RM for research into catalysis, space phenomena and sensor applications, or for producing environmentally friendly energy. A background on RM is presented, with its structure and special properties, and the working principle of RM generation. The experimental set-ups, materials, and detectors used are discussed, together with methods to improve the amount of RM produced. The materials used for the catalysts are of special interest, as this should have a large influence on the energy of the RM, and therefore also on the applications. Currently most of the catalysts used are potassium doped iron oxide designed for styrene production, which should give the possibility of improvements. And as there is little knowledge on the exact mechanisms for RM formation, suggestions are given as to where research should start.

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“…Calibration curves of each analyte were constructed using relative response factor against concentration of analyte from gas chromatography signals of prepared mixtures of known composition and used for estimating the percentage of each analyte in the liquid products. In this analysis, tetralin was used as an internal standard substance [26]. A typical calibration plot for determining the percentage of ethylbenzene composition in the mixture of products is shown in Fig.…”

Section: Catalytic Activity Studiesmentioning

confidence: 99%

Catalytic functionalities of Pd catalysts supported on spinel MgAl2O4 for coupling of ethylbenzene dehydrogenation with nitrobenzene hydrogenation

et al. 2014

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Direct coupling of oxidative dehydrogenation of ethylbenzene with nitrobenzene hydrogenation in a fixed-bed catalytic reactor at atmospheric pressure in the temperature range of 673-823 K over MgAl 2 O 4-supported palladium catalysts has been investigated. Simple dehydrogenation of ethylbenzene (DHEB) is reversible, endothermic and thermodynamically limited. The continuous removal of co-produced hydrogen in DHEB for in situ hydrogenation of nitrobenzene over Pd/MgAl 2 O 4 catalyst improves the performance of the DHEB process. A series of Pd (0.25-4.0 wt%) catalysts supported on MgAl 2 O 4 was prepared. The catalyst samples were characterized by X-ray diffraction (XRD), H 2-Temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), CO chemisorption, CO 2-Temperature-programmed desorption and BET surface area. Dispersion and particle size of Pd were obtained by CO chemisorption. The reaction profile shows that palladium (0.5 wt%) is an optimum loading to get maximum conversion of ethylbenzene (51.8 %) and nitrobenzene (47.3 %) to give 91.4 and 100 % selectivity of styrene and aniline, respectively.

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High Performance of Fe–K Oxide Catalysts for Dehydrogenation of Ethylbenzene to Styrene with an aid of ppm-order Pd

Cited by 23 publications

References 8 publications

Lanthanoid-free perovskite oxide catalyst for dehydrogenation of ethylbenzene working with redox mechanism

Lanthanoid-free perovskite oxide catalyst for dehydrogenation of ethylbenzene working with redox mechanism

A Condensed Excited (Rydberg) Matter: Perspective and Applications

Catalytic functionalities of Pd catalysts supported on spinel MgAl2O4 for coupling of ethylbenzene dehydrogenation with nitrobenzene hydrogenation

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