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

doi:10.1023/a:1019084915149

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…In most of the papers on the catalytic reactions of hydrocarbons with carbon dioxide an observation prevails, that introduction of CO 2 into the feed can decrease significantly (or even suppress) the coke deposition in comparison with the reaction under an inert gas atmosphere [6][7][8][9][10][11][12][13][14][15][16]. It is unquestionable that carbon dioxide is adsorbed on basic centers and after activation on the catalyst surface it can act as a mild oxidant capable to remove the carbonaceous deposit in the Boudouard reaction [17].…”

Section: Introductionmentioning

confidence: 99%

Deactivation of VMgO x Catalysts by Coke in the Process of Isobutane Dehydrogenation with Carbon Dioxide

Ogonowski

Skrzyńska

2007

Catal Lett

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The process of isobutane dehydrogenation in the presence or absence of carbon dioxide was carried out over VMgO x catalysts with different vanadium loading. The performed tests show that both the reaction atmosphere and physicochemical properties of the catalysts (related to vanadium content) have a great influence on the activity decrease and the carbonaceous deposit formation. Despite small ability of carbon dioxide to remove coke in the Boudouard reaction, the amounts of carbonaceous species deposited on the catalysts after the isobutane dehydrogenation under CO 2 atmosphere were even twice greater in comparison to those deposited in helium stream. Moreover, the rate of coke deposition during the dehydrogenation in the inert gas flow was only slightly dependent on the reaction time, in contrast to the process in carbon dioxide atmosphere. The results show that the coke formation on VMgO x is enhanced predominantly by surface acidity of the catalysts, which grows with the vanadium content and the presence of CO 2 in the feed.

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Section: Introductionmentioning

confidence: 99%

Deactivation of VMgO x Catalysts by Coke in the Process of Isobutane Dehydrogenation with Carbon Dioxide

Ogonowski

Skrzyńska

2007

Catal Lett

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“…The dispersion of metal oxide is one of the most important factors affecting the dehydrogenation activity of EB. We have previously reported that V/AC catalyst also shows high activity in the dehydrogenation of isopropyl benzene under CO 2 …”

Section: Resultsmentioning

confidence: 99%

“…We have previously reported that V/AC catalyst also shows high activity in the dehydrogenation of isopropyl benzene under CO 2 . 23 When chromium oxide was loaded onto the support materials, Cr/AC catalyst (entry 9) exhibited a high ST yield of 58.3% under CO 2 , although no promoting effect of CO 2 was observed. Except for the AC-loaded case, Cr-loaded catalyst (Cr/O-Dia, Cr/MgO, Cr/Al 2 O 3 ) afforded moderate to low activities, but increased ST yields were not observed under CO 2 flow.…”

Section: Activity Of Various Catalystsmentioning

confidence: 99%

Role of Lattice Oxygen of Metal Oxides in the Dehydrogenation of Ethylbenzene under a Carbon Dioxide Atmosphere

et al. 2009

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The mechanism for the dehydrogenation of ethylbenzene over V, Cr, and Fe oxides loaded on activated carbon, powdered diamond, Al(2)O(3), and MgO was studied in the presence of CO(2). Vanadium oxide-loaded catalysts provided higher styrene yields under CO(2) than Ar flow. The transient response method was carried out to understand the reaction behaviors of lattice oxygen of various metal oxides on the support. The results showed that lattice oxygen of vanadium oxide (V=O) was consumed in the dehydrogenation reaction and that reduced vanadium oxide was reoxidized with CO(2). A similar redox cycle was observed on iron oxide-loaded activated carbon catalyst. Spectroscopic characterization revealed that vanadium oxide and iron oxide on the support were reduced to a low valence state during the dehydrogenation reaction, and that CO(2) could oxidize the reduced metal oxides. In contrast, chromium(III) oxide was not reduced during dehydrogenation. From these findings, the redox cycle over vanadium oxide- and iron oxide-loaded catalysts was concluded to be an important factor in promoting the catalytic activity with CO(2).

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“…An activated-carbon-supported vanadium oxide catalyst afforded a high activity in a CO 2 atmosphere: the alpha-methylstyrene yield in a CO 2 atmosphere was twice as great as that obtained in an argon atmosphere at 450 °C. 92 Recently, the dehydrogenation of EB in the presence of CO 2 over an Al 2 O 3 -supported iron oxide catalyst was investigated at temperatures in the range of 525-600 °C under atmospheric pressure. The yield of styrene increased as W/F increased and reached its highest value (74%) at a W/F value of ∼40 g cat min/mmol EB, where the selectivity to styrene was 96%.…”

Section: Dehydrogenation Of Ethylbenzene To Styrenementioning

confidence: 99%

“…In addition, the dehydrogenation of isopropylbenzene to alpha-methylstyrene was performed using various supported metal oxide catalysts in the presence of CO 2 . An activated-carbon-supported vanadium oxide catalyst afforded a high activity in a CO 2 atmosphere: the alpha-methylstyrene yield in a CO 2 atmosphere was twice as great as that obtained in an argon atmosphere at 450 °C …”

Section: Dehydrogenation Of Ethylbenzene To Styrenementioning

confidence: 99%

Catalytic Conversion of Alkanes to Olefins by Carbon Dioxide Oxidative DehydrogenationA Review

2004

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The utilization of carbon dioxide (CO 2 ), which is one of the main contributors to the greenhouse effect, has been a topic of global interest, from both fundamental and practical viewpoints. In addition to be the sources of carbon, CO 2 might also be utilized as an oxygen source or oxidant, because it can be considered to be a nontraditional (mild) oxidant and oxygen transfer agent. In this paper, CO 2 as an oxidant for the selective oxidative conversions of alkanes to alkenes has been reviewed, including methane coupling to ethylene, C 2 -C 4 alkanes dehydrogenation to their corresponding olefins, dehydroaromerization of lower hydrocarbons to benzene, and dehydrogenation of ethylbenzene to styrene. It has been shown that CO 2 has the potential to offer a promising alternative to oxygen for selective oxidation, whereas the catalyst development is the key to the applications.

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Cited by 8 publications

References 13 publications

Deactivation of VMgO x Catalysts by Coke in the Process of Isobutane Dehydrogenation with Carbon Dioxide

Deactivation of VMgO x Catalysts by Coke in the Process of Isobutane Dehydrogenation with Carbon Dioxide

Role of Lattice Oxygen of Metal Oxides in the Dehydrogenation of Ethylbenzene under a Carbon Dioxide Atmosphere

Catalytic Conversion of Alkanes to Olefins by Carbon Dioxide Oxidative DehydrogenationA Review

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