Dehydrogenation of ethylbenzene to styrene using Pt, Mo, and Pt–Mo catalysts supported on clay nanocomposites

Morán, César; González, Eduardo; Sánchez, Jorge; Solano, Roger; Carruyo, Gabriela; Moronta, Alexander

doi:10.1016/j.jcis.2007.06.027

Cited by 17 publications

(17 citation statements)

References 20 publications

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“…However, the intensity of the first reduction peak decreased significantly when the IMP was used. This behavior could be as a because the Pt surface was modified by the Mo species, because the latter is as three-fold as the former [28]. This modification will be discussed later using the CO-FTIR and XPS measurements.…”

Section: Catalyst Characterizationmentioning

confidence: 90%

“…150 • C, which corresponds to the Pt particles reduced to Pt 0 completely; at ca. 240 • C, attributed to the reduction of Pt interacting with the support [27,28]; and from 450 • C, attributed to reduction of MoO 3 and the complete reduction, as well as the metal-support interactions [28,29]. However, the intensity of the first reduction peak decreased significantly when the IMP was used.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Co-Aromatization of n-Butane and Methanol over PtSnK-Mo/ZSM-5 Zeolite Catalysts: The Promotion Effect of Ball-Milling

et al. 2018

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The ball-milling (BM) method benefits the stabilization and dispersion of metallic particles for the preparation of the PtSnK–Mo/ZSM-5 catalyst. Based on the TPR, H2-TPD, XPS, and CO-FTIR results, the Pt–SnOx and MoOx species were formed separately on the BM sample. During the aromatization of cofeeding the n-butane with methanol, the yield of the aromatics is 59 wt.% at a n-butane conversion of 86% at 475 °C over the Pt Mo BM catalyst. The more weak acid sites also contribute to the aromatics formation with the less light alkanes formation. For the Pt Ga catalysts, the slow loss of activity suggests that the BM method can restrain the coke deposition on the Pt-SnOx species, because of a certain distance between the Pt–SnOx and GaOx species on the surface of ZSM-5.

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Section: Catalyst Characterizationmentioning

confidence: 90%

Section: Catalyst Characterizationmentioning

confidence: 99%

Co-Aromatization of n-Butane and Methanol over PtSnK-Mo/ZSM-5 Zeolite Catalysts: The Promotion Effect of Ball-Milling

et al. 2018

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“…Since that time, both the catalyst and the process have undergone several improvements, such as the introduction of beds with radial flow and the use of poison inhibitors (Shreve and Brink, 1997). Several works have been carried out (Santos et al, 2006;Rangel et al, 2003;Ramos et al, 2008;Miyakoshi et al, 2001;Liao et al, 2008) aiming to improve the iron-based catalysts or to find new alternatives systems and process conditions (Holtz et al, 2008;Oliveira et al, 2008;Morán et al, 2007;Ohishi et al, 2005).…”

Section: Ethylbenzene Dehydrogenation In the Presence Of Carbon Dioxidementioning

confidence: 99%

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Rangel¹,

Monteiro²,

Oportus³

et al. 2012

Greenhouse Gases - Capturing, Utilization and Reduction

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“…In the first one, ST is produced as a sideproduct in the epoxidation of propene with ethylbenzene (EB) hydroperoxide with Mo complex based catalysts. The second one and also the most important manufacturing route to ST is by the direct dehydrogenation of EB on iron oxide catalysts at 873-973 K, just below the decomposition temperature of the reactant [2,[6][7][8][9]. Because the reaction is highly endothermic and volume-increasing, a large amount of superheated steam is used to supply heat, decline the partial pressure of the reactants to shift the equilibrium to ST, and inhibit the buildup of coke or of coke precursors on catalyst surface to prolong the catalyst activity, and eventually keep the iron oxide in an appropriate oxidation state [8,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Comparison of single-bed oxidative dehydrogenation of ethylbenzene with double-bed using CO2

2019

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The present study highlights the catalytic performance of 5 wt% Fe 2 O 3 supported on sodium chromosilicate (5F/NCS) in a single-bed reactor for dehydrogenation of ethylbenzene with CO 2 and compares it with the catalytic performance of two subsequent catalysts (5F/NCS + industrial oxidation catalyst) in a double-bed reactor. The support of the target nanocomposite catalyst was obtained by hydrothermal treatment and subsequently was loaded with a medium amount of 5 wt% γ-Fe 2 O 3. Structural and textural characterizations of the catalysts were performed by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 physical adsorption analysis, and Fourier-transform infrared spectroscopy. The catalytic tests revealed that 5F/NCS in the single-bed reactor had a high ethylbenzene conversion (> 54%) and a low styrene selectivity (> 70%). In comparison with this observation, in the double-bed reactor with the presence of oxidation catalysts, styrene selectivity increased significantly (> 91%), however; ethylbenzene conversion indicated a minor decrease (> 50%). The high styrene selectivity (> 91%) and styrene yield (> 46%) in the double-bed reactor were ascribed to the coupling reaction of ethylbenzene dehydrogenation and RWGS as well as the synergistic effect of Pt-Sn in the structure of oxidation catalyst.

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Dehydrogenation of ethylbenzene to styrene using Pt, Mo, and Pt–Mo catalysts supported on clay nanocomposites

Cited by 17 publications

References 20 publications

Co-Aromatization of n-Butane and Methanol over PtSnK-Mo/ZSM-5 Zeolite Catalysts: The Promotion Effect of Ball-Milling

Co-Aromatization of n-Butane and Methanol over PtSnK-Mo/ZSM-5 Zeolite Catalysts: The Promotion Effect of Ball-Milling

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Comparison of single-bed oxidative dehydrogenation of ethylbenzene with double-bed using CO2

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