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  Tungsten–niobium oxide bronzes: a bulk and surface structural study

Delgado Muñoz, D., Concepción, P., Trunschke, A., & López Nieto, J. M. (2020). Tungsten–niobium oxide bronzes: a bulk and surface structural study. Dalton Transactions, 49(38), 13282-13293. doi:10.1039/D0DT02058C.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-45D7-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-6537-A
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 Creators:
Delgado Muñoz, Daniel1, 2, Author              
Concepción, Patricia 1, Author
Trunschke, Annette2, Author              
López Nieto, José M.1, Author
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1Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Abstract: Materials from the WO3–Nb2O5 system, presenting bronze-type crystal structures, display outstanding functional properties for several applications as thermoelectric materials, lithium-ion battery electrodes, or catalysts. In this work, a series of W–Nb–O oxide bronzes have been synthesized by the hydrothermal method (with Nb/(W + Nb) ratios in the range of 0–1). A combination of bulk and surface characterisation techniques has been applied to get further insights into: (i) the effect of thermal treatments on as-prepared materials and (ii) the surface chemical nature of W–Nb–O oxide bronzes. Thermal treatments promote the following structural changes: (i) loss of emerging long-range order and (ii) the elimination of NH4+ and H2O species from the structural channels of the as-synthesized materials. It has been observed that W–Nb–O bronzes with Nb at% of <em>ca.</em> 50% are able to retain a long-range order after heat-treatments, which is attributed to the presence of a Cs0.5[W2.5Nb2.5O14]-type structure. Increasing amounts of Nb5+ in the materials (i) promote a phase transition to pseudocrystalline phases ordered along the <em>c</em>-axis; (ii) stabilize surface W5+ species (elucidated by XPS); and (iii) increase the proportion of surface Lewis acid sites (as determined by the FTIR of adsorbed CO). Results suggest that pseudocrystalline oxides (with a Nb at% ≥ 50%) are closely related to NbO7 pentagonal bipyramid-containing structures. The stabilisation of Lewis acid sites on these pseudocrystalline materials leads to a higher yield of heavy compounds, at the expense of acrolein formation, in the gas-phase dehydration of glycerol.

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Language(s): eng - English
 Dates: 2020-06-092020-08-212020-08-212020-10-14
 Publication Status: Published in print
 Pages: 12
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/D0DT02058C
 Degree: -

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Title: Dalton Transactions
  Abbreviation : Dalton Trans.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: 12 Volume / Issue: 49 (38) Sequence Number: - Start / End Page: 13282 - 13293 Identifier: ISSN: 1477-9226
CoNE: https://pure.mpg.de/cone/journals/resource/954925269323