Dehydrogenation of Ethylbenzene over Vanadium Oxide-Loaded MgO Catalyst: Promoting Effect of Carbon Dioxide

Sakurai, Yoshihiro; Suzaki, Takamasa; Nakagawa, Kiyoharu; Ikenaga, Naoki; Aota, Hiroyuki; Suzuki, Toshimitsu

doi:10.1006/jcat.2002.3593

Cited by 124 publications

(107 citation statements)

References 23 publications

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“…The easy redox cycle between fully oxidized and reduced vanadium species generates a highly active catalyst [31,[34][35][36][37]. The variation of catalytic activity of V/SBA catalysts with vanadium content follows the same trend as the amount of dispersed vanadium species (Table 1), suggesting that the dispersed vanadium species on the SBA-15 support are mainly responsible for the catalytic activity in isobutane dehydrogenation with CO2.…”

Section: Catalytic Performancementioning

confidence: 99%

“…This result indicates the nature of the deposited carbon and reveals the graphitic and amorphous carbon deposition from isobutane dehydrogenation with CO2. This observation indicates that the coke formation is mainly responsible for the deactivation of vanadiabased catalysts in dehydrogenation reactions in the presence of CO2 [20,34,36,39]. A regeneration treatment of the 7% V/SBA catalyst after 250 min of reaction at 570 °C in the presence of CO2 was attempted.…”

Section: Catalytic Performancementioning

confidence: 99%

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Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

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A series of vanadia catalysts supported on SBA-15 (V/SBA) with a vanadia (V) content ranging from 1% to 11% were prepared by an incipient wetness method. Their catalytic behavior in the dehydrogenation of isobutane to isobutene with CO 2 was examined. The catalysts were characterized by N 2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and temperature-programmed reduction (TPR). It was found that these catalysts were effective for the dehydrogenation reaction, and the catalytic activity is correlated with the amount of dispersed vanadium species on the SBA-15 support. The 7% V/SBA catalyst shows the highest activity, which gives 40.8% isobutane conversion and 84.8% isobutene selectivity. The SBA-15-supported vanadia exhibits higher isobutane conversion and isobutene selectivity than the MCM-41-supported one.

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Section: Catalytic Performancementioning

confidence: 99%

Section: Catalytic Performancementioning

confidence: 99%

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

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“…Styrene is one of the most used intermediate for organic synthesis, being used as feedstock in the production of synthetic rubbers, plastics and resins copolymers, among other products of high commercial value (Sakurai et al, 2002). This monomer can be obtained by several routes, but the ethylbenzene dehydrogenation in the presence of steam is the main commercial route to produce this monomer.…”

Section: Ethylbenzene Dehydrogenation In the Presence Of Carbon Dioxidementioning

confidence: 99%

“…This monomer can be obtained by several routes, but the ethylbenzene dehydrogenation in the presence of steam is the main commercial route to produce this monomer. This process allows to supply 90% of the global production of styrene, which is approximately 13 x 10 6 t/year (Sakurai et al, 2002;Cavani and Trifiró, 1995).…”

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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“…As a typical example, over Mg-Al-V mixed oxides, the initial styrene yield, 64% after 1 h on stream, decreased to 40% after 7 h. 7 The similar deactivation rate was observed also for VO x /MgO catalyst. 3 We have proposed a very active and selective catalyst, V 0:43 Sb 0:57 O x / Al 2 O 3 (VSb/Al), but its deactivation was also significant mainly owing to coke formation although the deactivation rate was less than other reported catalysts. 12,13 Since the coke precursors are easily formed through the oligomerization of olefins, facilitation of olefins desorption from a catalyst surface could minimize the carbon accumulation.…”

mentioning

confidence: 99%

Dehydrogenation of Ethylbenzene with Carbon Dioxide as Oxidant over Mg-modified Alumina-supported V–Sb Oxide Catalysts

Hong¹,

Chang²,

Vislovskiy³

et al. 2005

Chemistry Letters

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Modification of alumina support with an appropriate amount of magnesia (Mg/Al ¼ 0:1) leads to the stable activity of the supported vanadium-antimony oxide catalyst for the dehydrogenation of ethylbenzene into styrene in the presence of carbon dioxide as oxidant. Correlation between catalytic performance and surface acidity has been found.Catalytic dehydrogenation of ethylbenzene in the presence of carbon dioxide (CO 2 -EBDH) has recently been attempted to explore a new technology for producing styrene selectively because it could provide us with an energy-saving and environmentally friendly process to utilize CO 2 , a greenhouse gas, as a mild oxidant.1-3 Several families of the catalysts, mainly based on supported or mixed oxides of Fe, V, or Cr were found to be active and selective in the CO 2 -EBDH.2-14 However, most of the catalysts have usually shown strong deactivation for this reaction during even a few hours on stream. As a typical example, over Mg-Al-V mixed oxides, the initial styrene yield, 64% after 1 h on stream, decreased to 40% after 7 h. 7 The similar deactivation rate was observed also for VO x /MgO catalyst. 3 We have proposed a very active and selective catalyst, V 0:43 Sb 0:57 O x / Al 2 O 3 (VSb/Al), but its deactivation was also significant mainly owing to coke formation although the deactivation rate was less than other reported catalysts. 12,13 Since the coke precursors are easily formed through the oligomerization of olefins, facilitation of olefins desorption from a catalyst surface could minimize the carbon accumulation. Taking into consideration a basic character of electron-rich olefins including styrene, lower surface acidity of the catalyst appears to induce easier desorption of olefins from the catalyst surface. VO x catalysts loaded on MgAl oxide support exhibited a decreased adsorption and rapid desorption of propylene as compared with those on alumina.14,15 Based on these considerations, an attempt has been made to stabilize the activity of VSb/ Al catalyst in the CO 2 -EBDH by the modification of the alumina support with a basic MgO component.MgO-modified alumina (Mg n Al) supports were obtained by impregnation of an activated alumina with aqueous solutions containing a certain amount of Mg(NO 3 ) 2 . 6H 2 O (Mg n Al; n is an atomic ratio of Mg/Al ¼ 0:1, 0.3, or 0.5) followed by calcination at 670 C. Alumina (Al)-or Mg n Al-supported vanadiumantimony oxide catalysts were prepared by impregnation with the solutions of NH 4 VO 3 and SbCl 3 followed by calcination at 650 C. The loading of the supported V 0:43 Sb 0:57 O x component (20 wt %) was the same for all samples. The catalyst supports and supported catalysts were characterized by BET specific surface area (S BET ) measurements (Micrometrics model ASAP 2400), X-ray diffraction (XRD) (Rigaku D/MAX-3B diffractometer) and the NH 3 -temperature-programmed-desorption method (NH 3 -TPD) (Micrometrics, TPD/TPR 027 Option). The catalytic tests were performed with 1 g of catalyst at 595 C under atmospheric pressure in an isothermal ...

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Dehydrogenation of Ethylbenzene over Vanadium Oxide-Loaded MgO Catalyst: Promoting Effect of Carbon Dioxide

Cited by 124 publications

References 23 publications

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Dehydrogenation of Ethylbenzene with Carbon Dioxide as Oxidant over Mg-modified Alumina-supported V–Sb Oxide Catalysts

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