Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts

Atanda, Luqman; Jermy, B. Rabindran; Khurshid, Alam; Al-Ali, A. R.; Sagata, Kunimasa; Asamoto, Makiko; Yahiro, Hidenori; Nomura, Kiyoshi; Sano, Tsuneji; Takehira, Katsuomi; Al-Khattaf, S.

doi:10.1016/j.apcata.2011.02.003

Cited by 9 publications

(9 citation statements)

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“…8 Mathew et al, reported low conversions of ethylbenzene and low selectivity of styrene at 698 K on Cu, Co and Fe mixed oxide catalyst. 33 Guo et al Reported 88% ethylbenzene conversion but with low styrene selectivity on higher loadings of cobalt on carbon nano tube catalysts at 823 K. 36 As shown in figures 7 and 8, cobalt oxide supported on COK-12 catalysts show good catalytic activity towards ethylbenzene especially under CO 2 flow. Figure 9 shows the time on steam study at 873 K under N 2 and CO 2 co-feedings separately over 3 wt % cobalt oxide catalyst.…”

Section: Resultsmentioning

confidence: 92%

“…There are no reports available for dehydrogenation of ethylbenzene over Co 3 O 4 /COK-12 catalysts, but some research groups are working on the Co catalysts with different supports for dehydrogenation of ethylbenzene. [33][34][35][36][37][38][39][57][58][59] Figure 7 and 8 show the catalytic activity of various loadings of cobalt oxide supported on COK-12 catalysts for dehydrogenation of ethylbenzene with CO 2 as soft oxidant and inert gas (N 2 ) flow respectively at various temperatures. Pure support, COK-12 and bulk Co 3 O 4 exhibits poor dehydrogenation activity for the conversion of ethylbenzene.…”

Section: Resultsmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Different supporting cobalt catalysts have been investigated for dehydrogenation of ethylbenzene, such as iron oxide, aluminium pillared clay, carbon nanotube MCM-41 and hydrotalcites. 5,9,[29][30][31][32][33] Among these, the catalysts containing mesoporous molecular sieves as supports have shown good results due to the presence of high surface area and ordered structure. 8 Recently, mesoporous molecular sieve-supported oxide materials such as SBA-15, MCM-41, and silicalitemesoporous zeolite have been investigated as catalysts and supports.…”

Section: Introductionmentioning

confidence: 99%

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Studies on ethylbenzene dehydrogenation with CO2 as soft oxidant over Co3O4/COK-12 catalysts

et al. 2015

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Oxidative dehydrogenation of ethylbenzene to styrene has been studied over Co 3 O 4 supported on mesoporous silica (COK-12) with CO 2 as soft oxidant in a fixed bed reactor at atmospheric pressure in the temperature range of 723 to 923K. While COK-12 has been prepared by self-assembly method using long chain ionic surfactant i.e., P123 as template, cobalt oxide supported on COK-12 catalysts with variable Co content have been synthesised by simple wet impregnation technique. All the catalysts were characterized by N 2 adsorption -desorption, XRD, FT-IR, TPR, UV-Vis and XPS techniques. XRD and pore size distribution studies indicate the intactness of mesoporous structure of SiO 2 even after incorporation of Co 3 O 4 . Presence of Co 3 O 4 crystallites were observed beyond 5 wt% Co loading. High ethylbenzene conversion and stable styrene yields have been observed over 3% Co 3 O 4 /COK-12 catalyst due to the presence of large number of active Co 3 O 4 catalytic sites. Enhancement in the activity has been observed with CO 2 as soft oxidant than with N 2 as diluent. This is because of the fact that the liberated H 2 reacts with CO 2 in the form of reverse water gas shift reaction.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on ethylbenzene dehydrogenation with CO2 as soft oxidant over Co3O4/COK-12 catalysts

et al. 2015

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“…Simultaneously, the amount of reducible Fe 3+ was the smallest, resulting in a high stability of the active Fe 3+ species against the reduction to Fe 0 . In the second paper [14], bimetallic Fe-Co system showed a clear synergy, i.e., the highest activity was obtained at x = 0.25 among Fe 0.5-x -Co x /Mg 3 (Al 0.5 )O (x = 0-0.5),…”

Section: Introductionmentioning

confidence: 88%

“…[21]. Mössbauer measurements suggest that much amount of Fe 3+ was incorporated in spinel than periclase compared to the values expected from XRD analyses [13,14]. Contrarily, ºC, and each was tested in the dehydrogenation of ethylbenzene (Fig.…”

Section: Surface Area Metal Composition and Crystal Structure Of Thementioning

confidence: 96%

Catalytic mechanism of the dehydrogenation of ethylbenzene over Fe–Co/Mg(Al)O derived from hydrotalcites

Tope

Jermy

Khurshid

et al. 2011

Applied Catalysis A: General

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Catalytic mechanism of ethylbenzene dehydrogenation over Fe-Co/Mg(Al)O derived from hydrotalcites has been studied based on the XAFS and XPS catalyst characterization and the FTIR measurements of adsorbed species. Fe-Co/Mg(Al)O showed synergy, whereas Fe-Ni/Mg(Al)O showed no synergy, in the dehydrogenation of ethylbenzene. Ni species were stably incorporated as Ni 2+ in the regular sites in periclase and spinel structure in the Fe-Ni/Mg(Al)O. Contrarily, Co species exists as a mixture of Co 3+ /Co 2+ in the Fe-Co/Mg(Al)O and was partially isolated from the regular sites in the structures with increasing the Co content. Co addition enhanced Lewis acidity of Fe 3+ active sites by forming Fe 3+-O-Co 3+/2+ (1/1) bond, resulting in an increase in the activity. FTIR of ethylbenzene adsorbed on the Fe-Co/Mg(Al)O clearly showed formations of CO bond and π-adsorbed aromatic ring. This suggests that ethylbenzene was strongly adsorbed on the Fe 3+ acid sites via π-bonding and the dehydrogenation was initiated by α-H + abstraction from ethyl group on Mg 2+-O 2basic sites, followed by CO -Mg bond formation. The α-H + abstraction by O 2-(-Mg 2+) was likely followed by β-H abstraction, leading to the formations of styrene and H 2. Such catalytic mechanism by the Fe 3+ acid-O 2-(-Mg 2+) base couple and the Fe 3+ /Fe 2+ reduction-oxidation cycle was further assisted by Co 3+ /Co 2+ , leading to a good catalytic activity for the dehydrogenation of ethylbenzene.

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Catalysts for the production of styrene from ethylbenzene: Redox and deactivation study

Irún¹,

Sadosche²,

Lasobras³

et al. 2013

Catalysis Today

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Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts

Cited by 9 publications

References 44 publications

Studies on ethylbenzene dehydrogenation with CO2 as soft oxidant over Co3O4/COK-12 catalysts

Studies on ethylbenzene dehydrogenation with CO2 as soft oxidant over Co3O4/COK-12 catalysts

Catalytic mechanism of the dehydrogenation of ethylbenzene over Fe–Co/Mg(Al)O derived from hydrotalcites

Catalysts for the production of styrene from ethylbenzene: Redox and deactivation study

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