Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles
Artikel i vetenskaplig tidskrift, 2021

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.

Författare

Martin Ek

Haldor Topsoe

Kompetenscentrum katalys (KCK)

Chalmers, Fysik, Eva Olsson Group

Logi Arnarson

Haldor Topsoe

Poul Georg Moses

Haldor Topsoe

Soren B. Rasmussen

Haldor Topsoe

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Eva Olsson

Chalmers, Fysik, Nano- och biofysik

Kompetenscentrum katalys (KCK)

Stig Helveg

Haldor Topsoe

Danmarks Tekniske Universitet (DTU)

Nanoscale

2040-3364 (ISSN)

Vol. In Press

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemi

DOI

10.1039/d0nr08943e

PubMed

33889890

Mer information

Senast uppdaterat

2021-05-11