Oxidative Dehydrogenation of Propane over Vanadia–Magnesia Catalysts Prepared by Thermolysis of OV(OtBu)3 in the Presence of Nanocrystalline MgO

Pak, Chanho; Bell, Alexis T.; Tilley, T. Don

doi:10.1006/jcat.2001.3473

Cited by 109 publications

(64 citation statements)

References 61 publications

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“…Reference phases, including Mg 3 (VO 4 ) 2 , Mg 2 V 2 O 7 and V 2 O 5 , were also collected. Consistent with previous studies, Mg 3 (VO 4 ) 2 shows a clear Raman peak at 864 cm )1 [24][25][26], whereas Mg 2 V 2 O 7 gives Raman peaks at 947 and 901 cm )1 [26,27]. None of these peaks are apparent between 0% to 10%.…”

Section: Raman Spectroscopysupporting

confidence: 92%

Effect of Sol–gel Synthesis on Physical and Chemical Properties of V/SiO2 and V/MgO Catalysts

Lin

Hohn

2006

Catal Lett

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Catalytic properties of supported vanadium oxide catalysts are highly dependent on surface vanadia configuration and the nature of the support. In this study, the effects of using the same supports (silica and magnesia) from two different preparation procedures on the catalytic properties in methanol partial oxidation and on the vanadium surface structures were investigated. Both types of catalysts were prepared by the incipient-wetness method and characterized using BET, Raman spectroscopy, UV-Vis and H 2 -TPR to determine the structures of vanadium on the supports' surface. Both aerogel-prepared V/SiO 2 and V/MgO catalysts were more active than conventionally prepared samples in methanol partial oxidation. These differences in catalytic results are attributed to the configurations of active phase. It was also found that small vanadium phases were more active in methanol partial oxidation than larger phases.

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Section: Raman Spectroscopysupporting

confidence: 92%

Effect of Sol–gel Synthesis on Physical and Chemical Properties of V/SiO2 and V/MgO Catalysts

Lin

Hohn

2006

Catal Lett

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“…It seems that highly dispersed VO x species (i.e. predominantly monovanadates) over non-acidic supports are more selective than polymerized ones [12,14,25,[27][28][29]. In contrast s (no bulk like crystalline V 2 O 5 ) are considered to be more active than highly dispersed ones.…”

mentioning

confidence: 99%

Impact of preparation method on physico-chemical and catalytic properties of VOx/γ-Al2O3 materials

Schwarz

Habel

Ovsitser

et al. 2008

Journal of Molecular Catalysis A: Chemical

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Two preparation methods (wet saturation impregnation with vanadyl acetylacetonate and ball-milling of γ-Al 2 O 3 with crystalline V 2 O 5 ) were applied to produce two sets of VO x /γ-Al 2 O 3 catalysts with increasing vanadium loadings. Materials from both sets were characterized by XRD, SEM, Raman, TPR and UV/Vis-DRS to elucidate the influence of the preparation method on the morphology of VO x species and on their behavior in the oxidative dehydrogenation of propane (ODP). Edge energies from UV/Vis-DRS experiments were correlated with activity and selectivity data; the lower the edge energy, the lower catalytic activity and the higher propene selectivity. Both preparation methods result in materials with comparable physico-chemical and catalytic properties although very different precursors were used. Especially the calcination step during catalyst preparation seems to transform the different precursor molecules to dispersed VO x species by an equilibration process on the support aterial surface. m

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“…V2O5, tetraethoxysilane (TEOS), t-butanol, benzene, toluene, diethylene glycol monoethyl ether and polyethylene glycol (PEGx, where x is the degree of polymerization (DP), x 2, 3, 10, and 25) were supplied by Wako Pure Chemical Industries, Ltd. PEGx (x 50) was provided by Nacalai Tesque Inc. Polyethylene glycol monomethyl ether was provided by SigmaAldrich Co. Vanadium oxy-tri-t-butoxide (V(OtBu)3O (V(OR))) was prepared according to the previously reported method 28) .…”

Section: Methodsmentioning

confidence: 99%

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 Propane over Vanadia–Magnesia Catalysts Prepared by Thermolysis of OV(OtBu)3 in the Presence of Nanocrystalline MgO

Cited by 109 publications

References 61 publications

Effect of Sol–gel Synthesis on Physical and Chemical Properties of V/SiO2 and V/MgO Catalysts

Effect of Sol–gel Synthesis on Physical and Chemical Properties of V/SiO2 and V/MgO Catalysts

Impact of preparation method on physico-chemical and catalytic properties of VOx/γ-Al2O3 materials

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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