Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles
(2021) In Nanoscale 13(15). p.7266-7272- Abstract
- Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, e.g., selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved in situ under catalytically relevant conditions by combining transmission electron microscopy imaging and electron... (More)
- Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, e.g., selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved in situ under catalytically relevant conditions by combining transmission electron microscopy imaging and electron energy loss spectroscopy. The measurements reveal that vanadium on {001} facets consistently retain higher oxidation states than on {10l} facets. Insight into such structure-sensitivity of surface redox processes opens prospects of tailoring oxide nanoparticles with enhanced catalytic functionalities. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/ca1e740a-9ac3-440c-8575-9a9be2ebd840
- author
- Ek, Martin LU ; Arnarson, Logi ; Moses, Poul Georg ; Rasmussen, Søren B. ; Skoglundh, Magnus ; Olsson, Eva and Helveg, Stig
- publishing date
- 2021-04-07
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nanoscale
- volume
- 13
- issue
- 15
- pages
- 7 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:85105114563
- ISSN
- 2040-3372
- DOI
- 10.1039/D0NR08943E
- project
- Understanding of Catalysts for Climate-Neutral Chemicals by in situ Transmission Electron Microscopy Characterization
- language
- English
- LU publication?
- no
- id
- ca1e740a-9ac3-440c-8575-9a9be2ebd840
- date added to LUP
- 2022-01-18 09:52:42
- date last changed
- 2022-04-27 07:11:52
@article{ca1e740a-9ac3-440c-8575-9a9be2ebd840, abstract = {{Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, <em>e.g.</em>, selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved <em>in situ</em> under catalytically relevant conditions by combining transmission electron microscopy imaging and electron energy loss spectroscopy. The measurements reveal that vanadium on {001} facets consistently retain higher oxidation states than on {10<em>l</em>} facets. Insight into such structure-sensitivity of surface redox processes opens prospects of tailoring oxide nanoparticles with enhanced catalytic functionalities.}}, author = {{Ek, Martin and Arnarson, Logi and Moses, Poul Georg and Rasmussen, Søren B. and Skoglundh, Magnus and Olsson, Eva and Helveg, Stig}}, issn = {{2040-3372}}, language = {{eng}}, month = {{04}}, number = {{15}}, pages = {{7266--7272}}, publisher = {{Royal Society of Chemistry}}, series = {{Nanoscale}}, title = {{Probing surface-sensitive redox properties of VO<sub>x</sub>/TiO<sub>2</sub> catalyst nanoparticles}}, url = {{http://dx.doi.org/10.1039/D0NR08943E}}, doi = {{10.1039/D0NR08943E}}, volume = {{13}}, year = {{2021}}, }