Oxidative dehydrogenation of n-butane over mesoporous VO x /SBA-15 catalysts

Liu, Wei; Lai, Su‐Yuan; Dai, Hongxing; Wang, Shuiju; Sun, Hairui; Au, Chak Tong

doi:10.1007/s10562-007-9023-y

Cited by 63 publications

(29 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, there have been only few reports on the application of SBA-15-supported vanadium oxide as catalyst for selective oxidation reactions. [21,22,[40][41][42][43][44][45] A different approach to powder vanadium oxide model catalysts is based on the controlled synthesis of molecular compounds, for example, vanadium calixarene complexes. [46,47] Figure 1 shows typical SEM and TEM images of a sample prepared by controlled synthesis with a vanadium loading of 3.3 wt % (V/SBA-15), which corresponds to a vanadium atom density of 0.8 V nm…”

Section: Controlled Synthesis Based On Spectro-a C H T U N G T R E N mentioning

confidence: 99%

Nanostructured Vanadium Oxide Model Catalysts for Selective Oxidation Reactions

Heß

2009

ChemPhysChem

View full text Add to dashboard Cite

Controlled synthesis based on spectroscopic characterization, structure, and catalytic performance of mesoporous silica SBA-15-supported vanadium oxide model catalysts (see TEM image) are reviewed. The effect of water on the structure and dispersion of highly dispersed vanadium oxide is discussed in the light of recent results in multiple in situ spectroscopy.Characterization of the synthesis, structure, and catalytic performance of vanadium oxide catalysts supported on mesoporous silica SBA-15 for selective oxidation reactions are reviewed. Controlled synthesis on the basis of surface functionalization and ion exchange allows homogeneous deposition of vanadium oxide within the pores of SBA-15. Catalytic tests on the selective oxidation of methanol and propane demonstrate the full catalytic function of these model powder catalysts. Characterization of the dehydrated state by vibrational spectroscopy provides insight into the structure of SBA-15-supported vanadium oxide at low loadings. The effect of water on the structure and dispersion of highly dispersed vanadium oxide is discussed in light of recent results from multiple in situ spectroscopy.

show abstract

Section: Controlled Synthesis Based On Spectro-a C H T U N G T R E N mentioning

confidence: 99%

Nanostructured Vanadium Oxide Model Catalysts for Selective Oxidation Reactions

Heß

2009

ChemPhysChem

View full text Add to dashboard Cite

show abstract

“…Figure 8 shows that the relative peak intensities of the 29 . However, the intensity ratios of these peaks corresponded well to the model structure (8). Unidentified minor resonances in Fig.…”

Section: Gel Formation Processmentioning

confidence: 67%

“…Since the molar ratio of TEOS/ V(OR) was kept at 16.7 (for a sample containing 1.0 mmol of V), the terminal _ OH groups of PEG25 were less likely to react with two V(OR). Vanadium was incorporated in the process of polycondensation of TEOS, as in (7), and two-and three-dimensional crosslinking then formed a simple model structure as in (8) by repeated reactions, as shown in Scheme 1. Silicon atoms at the four corners of (8) were linked with two PEG25.…”

Section: Gel Formation Processmentioning

confidence: 99%

“…With higher DP of PEGx, the broad combustion peak of reacted or free PEGx (or PEG2EE, PEGME) shifted to the higher temperature side. With higher DP of PEGx, the mass of PEG per unit mass of gel increased, and highly cross-linked gels such as (8) framework, since the use of PEG monomethyl ether afforded a similar material (Fig. 11 b), Fig.…”

Section: Texture Of Samples After Calcinationmentioning

confidence: 99%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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.

show abstract

“…It has also been reported that the V 4+ ion in association with oxygen vacancies acts as an active species [13,15]. A remarkable good performance in butane ODH has been attributed to the good dispersion of V species, the presence of V 4+ species and the pore structure [16]. It is well known that tetrahedral V is the active species but its environment remains controversial.…”

Section: Introductionmentioning

confidence: 99%

Propane Oxidative Dehydrogenation on V–Sb/ZrO2 Catalysts

et al. 2008

View full text Add to dashboard Cite

The catalytic properties of V-Sb/ZrO 2 and bulk Sb/V catalysts for the oxidative dehydrogenation of propane were studied. Samples were characterized by nitrogen adsorption, temperature-programmed reduction, temperature-programmed pyridine desorption and photoelectron spectroscopic techniques. Vanadia promotes the transition of tetragonal to monoclinic zirconia and the formation of ZrV 2 O 7 . Surface V and Sb oxide species do not appear to interact among them below monolayer coverage, but SbVO4 forms above monolayer. Simultaneously the excess of antimony forms a-Sb 2 O 4 . Activity and selectivity show no dependence on the acidity of the catalysts. However, there is a strong dependence of activity/selectivity on composition; surface vanadium species are active for propane oxidative dehydrogenation and the presence of Sb, affording rutile VSbO 4 phase makes the system selective to C 3 H 6 , this is believed to be related to the redox cycle involving dispersed V 5+ species and lattice reduced vanadium site in the rutile VSbO 4 phase.

show abstract

Oxidative dehydrogenation of n-butane over mesoporous VO x /SBA-15 catalysts

Cited by 63 publications

References 40 publications

Nanostructured Vanadium Oxide Model Catalysts for Selective Oxidation Reactions

Nanostructured Vanadium Oxide Model Catalysts for Selective Oxidation Reactions

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

Propane Oxidative Dehydrogenation on V–Sb/ZrO2 Catalysts

Contact Info

Product

Resources

About