Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles
Journal article, 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.

Author

Martin Ek

Chalmers, Physics, Eva Olsson Group

Haldor Topsoe

Competence Centre for Catalysis (KCK)

Logi Arnarson

Haldor Topsoe

Poul Georg Moses

Haldor Topsoe

Soren B. Rasmussen

Haldor Topsoe

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Eva Olsson

Chalmers, Physics, Nano and Biophysics

Competence Centre for Catalysis (KCK)

Stig Helveg

Technical University of Denmark (DTU)

Haldor Topsoe

Nanoscale

2040-3364 (ISSN)

Vol. 13 15 7266-7272

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemistry Topics

DOI

10.1039/d0nr08943e

PubMed

33889890

More information

Latest update

8/18/2021