Structural Characterization and Oxidehydrogenation Activity of CeO2/Al2O3and V2O5/CeO2/Al2O3Catalysts

Reddy, Benjaram M.; Rao, Komateedi N.; Reddy, Gunugunuri K.; Khan, Ataullah; Park, Sang-Eon

doi:10.1021/jp076617l

Cited by 111 publications

(61 citation statements)

References 59 publications

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“…The presence of consequently formed oxygen vacancies in the CeO2 lattice should result in a weak Raman peak at approx. 600 cm -1 [36]. This peak is not clearly observed ( …”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 86%

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Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Chytil

Kure

Lødeng

et al. 2017

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Abstract:High temperature H2S sorbents comprising manganese oxide (15 wt. %) supported on TiO2, ZrO2, CeO2 and Al2O3 were prepared by wet impregnation using Mn(NO3)2.4H2O as Mn precursor. Upon activation in H2, the sorbent performance testing was conducted at 650 °C in a model gas mixture with a composition of 0.4 vol. % of H2S in 40 vol. % of H2, the balance being inert gas (N2 and Ar).Sorbent regeneration was performed at 650 °C with 5.2 vol. % of O2 in N2. The initial sorption performance is first reported for the parent (Mn-free) supports showing a considerable H2S sorption on ZrO2 and CeO2 and a minor sorption on Al2O3 and TiO2. The Mn sorbents were subject to 13 sorption/regeneration cycles. The highest initial sorption capacity is reported for cerium supported Mn oxide, which is also the sample that deactivates most. A prolonged exposure to H2 at 650 °C results in a reversible loss of the sorption capacity that was observed for all the samples except for Mn on zirconia suggesting its superior stability in H2.

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“…The presence of consequently formed oxygen vacancies in the CeO2 lattice should result in a weak Raman peak at approx. 600 cm -1 [36]. This peak is not clearly observed ( …”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 86%

“…645 cm -1 . This peak is a characteristic of the fluorite structure and is attributed to triply degenerate F2g mode [36]. The spectrum is altered upon the impregnation with Mn as the prominent peak is broadened, shifted towards a lower wavenumber and shows a well-recognized shoulder.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 97%

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Chytil

Kure

Lødeng

et al. 2017

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“…XRD patterns of VA show that four diffraction peaks at 2h values of 37.5 (311), With increase in the composition of ceria from 3 to 7 %, the intensity of diffraction peaks of ceria increases due to the increase in crystallinity of the catalysts. Incorporation of large size of Ce 3? ions in the vacant positions of small size alumina might be the reason for the presence of both alumina and ceria peaks in XRD spectrum [38]. The CeO 2 crystallite size calculated from Debye-Scherrer equation in all the ceria promoted catalysts comes to be *50 nm.…”

Section: Xrd Analysismentioning

confidence: 93%

“…The advantage of CeO X on V 2 O 5 /TiO 2 -ZrO 2 catalyst in maintaining steady EB conversion with high ST selectivity for a period of 10 h time on stream study was reported [46]. Another study highlighted the advantage of CeO X to V 2 O 5 /Al 2 O 3 catalyst in promoting the EB conversion in CO 2 at low temperatures [38]. Another study indicated that among different phases of CeO X , CeO 2 cubes are active for EB dehydrogenation [21].…”

Section: Spent Catalyst Studiesmentioning

confidence: 97%

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

et al. 2016

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The present work highlights the influence of ceria over vanadia/alumina for the oxidative dehydrogenation of ethylbenzene to styrene with CO 2 as a soft oxidant. Various weight loadings (0, 3, 5, and 7 %) of ceria were incorporated into 10wt % V 2 O 5 /Al 2 O 3 catalyst by wet impregnation process. Structural and textural characterizations of the catalysts were performed by means of powder X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of CO 2 , N 2 adsorption-desorption analysis. Over 10 % V 2 O 5 /Al 2 O 3 , ethylbenzene conversion decreases from 62 to 49 % in a spam of 12 h. Ceria-incorporated catalyst (3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 ) showed steady ethylbenzene conversion of nearly 65 % with a styrene selectivity of 96 % for a period of 12 h time. Improved catalytic activity observed on this catalyst can be attributed to the increase in the number of redox/active VO x species after incorporation of ceria. The redox properties of 3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 and 10wt % V 2 O 5 /Al 2 O 3 were examined by reaction of CO 2 in pulses on to the partially reduced catalysts. The spent catalysts were characterized using XRD & TPR analysis to assess the reason for the deactivation of catalysts.

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“…Styrene is normally synthesized by two methods: mainly by an endothermic dehydrogenation of EB and as a coproduct of propylene oxide production [7][8][9][10]. The ODH of EB is a third possibility to produce styrene employing different oxidants, which has gained a great deal of attention recently [4][5][6][11][12][13][14][15]. The major advantage of the ODH process is that, unlike the endothermic dehydrogenation process, it can be operated at a lower temperature, as it is exothermic.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethylbenzene to Styrene with Carbon Dioxide over Fe2O3/TiO2–ZrO2 Catalyst: Influence of Chloride

et al. 2008

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This study was undertaken to know the influence of chloride ions in TiO 2 -ZrO 2 mixed oxide and to explore chloride containing Fe 2 O 3 /TiO 2 -ZrO 2 catalyst for oxidative dehydrogenation of ethylbenzene to styrene utilizing carbon dioxide as a soft oxidant. The TiO 2 -ZrO 2 mixed oxide was synthesized by a co-precipitation method. Over the calcined support, a nominal 15 wt.% Fe 2 O 3 was deposited by a wet impregnation method. The prepared catalysts were characterized using X-ray diffraction, temperature programmed desorption of NH 3 and CO 2 , scanning electron microscopy and BET surface area methods. The catalytic activity measurements were made in a fixed-bed microreactor under normal atmospheric pressure. Characterization studies reveal that chloride ions exhibit a strong influence on the physicochemical and catalytic properties of the titania-zirconia composite oxides. The impregnated iron oxide was found to be in a highly dispersed form over the TiO 2 -ZrO 2 support and influenced greatly on its acid-base properties. The chloride containing Fe 2 O 3 /TiO 2 -ZrO 2 catalyst exhibited better activity and selectivity. The order of activity on various samples was found to be Fe 2 O 3 /TiO 2 -ZrO 2 (chloride) [ TiO 2 -ZrO 2 (chloride) [ TiO 2 -ZrO 2 .

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Structural Characterization and Oxidehydrogenation Activity of CeO₂/Al₂O₃and V₂O₅/CeO₂/Al₂O₃Catalysts

Cited by 111 publications

References 59 publications

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

Oxidative Dehydrogenation of Ethylbenzene to Styrene with Carbon Dioxide over Fe2O3/TiO2–ZrO2 Catalyst: Influence of Chloride

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