A Refinement of the Crystal Structure of V6O13.

Wilhelmi, Karl-Axel; Waltersson, Kjell; Kihlborg, L. H. E.; Borch, Gunner; Schaumburg, Kjeld; Ehrenberg, L.

doi:10.3891/acta.chem.scand.25-2675

Cited by 157 publications

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“…29 Orthorhombic MoO 3 is found in samples with high Mo contents 0.9 r x r 1 for the crystallised and at x = 1 for the spray-dried samples. 23 The spray-dried sample with Mo content x = 1 contains monoclinic V 6 O 13 , SG C2/m, 30 and orthorhombic V 2 O 5 types.…”

Section: Preparation Techniques For Mixed Oxide Catalystsmentioning

confidence: 99%

Heterogeneously catalysed partial oxidation of acrolein to acrylic acid—structure, function and dynamics of the V–Mo–W mixed oxides

Kampe

Giebeler

Samuelis

et al. 2007

Phys. Chem. Chem. Phys.

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The major objective of this research project was to reach a microscopic understanding of the structure, function and dynamics of V-Mo-(W) mixed oxides for the partial oxidation of acrolein to acrylic acid. Different model catalysts (from binary and ternary vanadium molybdenum oxides up to quaternary oxides with additional tungsten) were prepared via a solid state preparation route and hydrochemical preparation of precursors by spray-drying or crystallisation with subsequent calcination. The phase composition was investigated ex situ by XRD and HR-TEM. Solid state prepared samples are characterised by crystalline phases associated to suitable phase diagrams. Samples prepared from crystallised and spray-dried precursors show crystalline phases which are not part of the phase diagram. Amorphous or nanocrystalline structures are only found in tungsten doped samples. The kinetics of the partial oxidation as well as the catalysts' structure have been studied in situ by XAS, XRD, temperature programmed reaction and reduction as well as by a transient isotopic tracing technique (SSITKA). The reduction and re-oxidation kinetics of the bulk phase have been evaluated by XAS. A direct influence not only of the catalysts' composition but also of the preparation route is shown. Altogether correlations are drawn between structure, oxygen dynamics and the catalytic performance in terms of activity, selectivity and long-term stability. A model for the solid state behaviour under reaction conditions has been developed. Furthermore, isotope exchange experiments provided a closer image of the mechanism of the selective acrolein oxidation. Based on the in situ characterisation in combination with micro kinetic modelling a detailed reaction model which describes the oxygen exchange and the processes at the catalyst more precisely is discussed.

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Section: Preparation Techniques For Mixed Oxide Catalystsmentioning

confidence: 99%

Heterogeneously catalysed partial oxidation of acrolein to acrylic acid—structure, function and dynamics of the V–Mo–W mixed oxides

Kampe

Giebeler

Samuelis

et al. 2007

Phys. Chem. Chem. Phys.

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“…1 (e)]. [13] When all the apices (vanadyl bonds) emerge up in one layer and also down in the other layers, a typical double layer of δ-type vanadium oxides can be created from single sheets [ Fig. 1(g)].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured layered vanadium oxide as cathode for high-performance sodium-ion batteries: a perspective

2017

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Sodium-ion batteries (SIBs) have received intensive attentions owing to the abundant and inexpensive sodium (Na) resource. Layered vanadium oxides are featured with various valence states and corresponding compounds, and through multi-electron reaction they are capable to deliver high Na storage capacity. The rational construction of unique structures is verified to improve their Na storage properties. This perspective provides an overview of recent advances in layered vanadium oxide for SIBs, with a particular focus on construction of novel nanostructures, and mechanism studies via in situ characterization. Finally, we predict possible breakthroughs and future trends that lie ahead for high-performance layered vanadium oxides SIBs cathode.

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“…2). Daneben können Vanadiumoxide (VöOi3 [2][3][4][5], VO2 [5]) und ternäre Vanadinoxide mit Wolfram oder Molybdän als Komponente (z. B.…”

Section: Introductionunclassified

Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VII^a Ein neuer einfacher Weg zur Berechnung von [(O,F)/Me]-Werten bei Blockstrukturen / Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VII^a A New Simple Method to Calculate Values of [(O,F)/Me] for Block Structures

Hibst

Gruehn

1978

Zeitschrift Für Naturforschung B

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A Refinement of the Crystal Structure of V6O13.

Cited by 157 publications

References 0 publications

Heterogeneously catalysed partial oxidation of acrolein to acrylic acid—structure, function and dynamics of the V–Mo–W mixed oxides

Heterogeneously catalysed partial oxidation of acrolein to acrylic acid—structure, function and dynamics of the V–Mo–W mixed oxides

Nanostructured layered vanadium oxide as cathode for high-performance sodium-ion batteries: a perspective

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