Oxidative dehydrogenation of ethane over vanadium-based hexagonal mesoporous silica catalysts

Čapek, Libor; Bulánek, Roman; Adam, J.; Smoláková, Lucie; Sheng-Yang, Hsu; Čičmanec, Pavel

doi:10.1016/j.cattod.2008.06.022

Cited by 32 publications

(19 citation statements)

References 30 publications

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“…Catalysts were activated in an oxygen stream at 450°C for 1 h before each catalytic test. Concentrations of CO 2 , CO, O 2 , and hydrocarbons were provided by an on-line connected gas chromatograph Shimadzu GC 17A [35,36]. …”

Section: Catalytic Experimentsmentioning

confidence: 99%

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

et al. 2011

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The activity of Ni-Al mixed oxides obtained by the thermal pre-treatment of Ni-Al hydrotalcite-like precursors was studied in the ODH of ethane and propane. The activity of the Ni-Al mixed oxide catalysts was studied with respect to (i) the role of Ni content and (ii) the role of temperature during Ni-Al HTs thermal pre-treatment. The structure analysis and the activity of Ni-Al mixed oxides were discussed in three groups; (A) the catalysts pre-treated at 500°C, (B) the catalysts pre-treated at 600°C and (C) the Ni2-Al catalyst with constant Ni content pre-treated at 500-900°C. Ni-Al mixed oxides were active and selective catalysts in the ODH of ethane even at 450°C. On the other hand, the catalysts posses low selectivity to propene. It is supposed that the interaction of NiO with alumina phase plays the critical role in the active and selective catalysts. The Ni-Al mixed oxides were characterized by XRD, H 2 -TPR and diffuse reflectance spectroscopy.

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Section: Catalytic Experimentsmentioning

confidence: 99%

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

et al. 2011

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“…Number of reactions studied over mesoporous materials continuously increases and involves reactions like conversion of synthesis gas [23], oxidative dehydrogenation of light alkanes or ethylbenzene [24][25][26][27][28], Knoevenagel and Henry reactions or Claisen-Schmidt condensation [29], acetalization and synthesis of acetals/ ketals [30,31], biomass transformation [32,33] or acylation reactions [34,35].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Catalysis Over Mesoporous Molecular Sieves

2009

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This overview covers the recent achievements in the application of mesoporous molecular sieves as catalysts and catalyst supports. Main structural and textural features are outlined in relation to the novel synthesis approaches of mesoporous molecular sieves and understanding of their properties. For application of mesoporous molecular sieves as catalysts different ways of introduction of active sites on their surfaces are provided. The main part describes selected catalytic reactions catalyzed by mesoporous molecular sieves focused on very recent papers. The examples include metathesis, acylation reactions, C-C coupling reactions of Heck and Suzuki types, basecatalyzed reactions (Knoevenagel and Michael additions, Claisen-Schmidt condensation, Tischenko reaction) and last but not least immobilization of organometallic complexes for different catalytic applications including chiral catalysts.

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“…Initially, the alkoxy-exchange reaction between V(OR) (1) and PEG25 proceeded to give (2). The alkoxy-exchange reaction between PEG25 in (2) and TEOS produced (3).…”

Section: Gel Formation Processmentioning

confidence: 99%

“…If the peak at 69.9 ppm is attributed to _ (OCH2CH2)n _ OCH2CH2 _ OSi (6), the ratio of the intensity of the peak at 71.4 (3) and 69.9 (2 6) ppm should vary in proportion to the molar ratio of (free _ OH of PEG25)/( _ OSi linked with PEG25). By deconvolution of the peaks of PEG25, the relative abundances of carbons (1), (2), and (3) were calculated to be 5.0, 8.4, and 86.6 %, respectively. The peak areas of (2 6) and (3) are denoted as P (2 6) and P(3), respectively.…”

Section: Si Cp-mas Nmr S P E C T R a O F T H E A S -P R E P A R E D Gmentioning

confidence: 99%

“…As an alternative to supported catalysts, isolated VO4 3-species can be incorporated into the MCM-41 frame structure by either direct syntheses 17), 18) or by ion exchange of VO 2 with the template cation in asprepared MCM-41 19), 20) . Similarly, V-incorporated microporous materials, such as V-silicalite 21), 22) and vanadium-incorporated aluminophosphate (VAPO-5) 23), 24) have been synthesized with high dispersion of vanadium species.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Isolated VO<sub>4</sub><sup>3−</sup> Species in Silica Framework by Alkoxy-exchange Reactions between Metal Alkoxides and Polyethylene Glycol

福留

池永

三宅

et al. 2015

J. Jpn. Petrol. Inst.

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Isolated VOx species incorporated in an SiO2-framework were synthesized by alkoxy-exchange reactions between Si(OEt)4, V(Ot-Bu)3O, and polyethylene glycol (PEG). Similar alkoxy-exchange rates between alkoxides of vanadium and silicon with PEG were necessary to obtain isolated VOx species in the SiO2-framework. Gel was formed during the exchange reaction occurring with heating from 50 to 160 , liberating ethanol and t-butanol, and the obtained gel was calcined in air at 600 . The calcined samples were characterized by N2 adsorption, XRD, Raman, FT-IR, H2-TPR, and NMR techniques. Adsorption-desorption isotherms of N2 of the obtained samples exhibited H4-type hysteresis patterns, indicating the presence of narrow neck pores. In addition, the presence of micropores was confirmed. The samples had high surface areas of approximately 1000 m 2 /g, and isolated VO43-species were present in the SiO2-framework. Oxidative dehydrogenation of ethylbenzene was performed as a test reaction, using CO2 as a mild oxidant. The reaction proceeded on the isolated VO4 3-species in the silica framework with high ethylbenzene conversion and high selectivity for styrene.

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Oxidative dehydrogenation of ethane over vanadium-based hexagonal mesoporous silica catalysts

Cited by 32 publications

References 30 publications

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

Recent Advances in Catalysis Over Mesoporous Molecular Sieves

Preparation of Isolated VO<sub>4</sub><sup>3−</sup> Species in Silica Framework by Alkoxy-exchange Reactions between Metal Alkoxides and Polyethylene Glycol

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