Why nitrogen oxide inhibits CO oxidation over highly dispersed platinum ceria catalysts
Journal article, 2024
The influence of nitrogen oxide on the lean CO oxidation activity of highly dispersed Pt/ceria and reference Pt/alumina catalysts has been studied by kinetic measurements and infrared spectroscopic characterization. Co-feeding of nitrogen oxide leads to the formation of nitrates on the supports that induce a highly oxidized character of the Pt sites and in the case of Pt/ceria, inhibit ceria lattice oxygens to react with CO adsorbed on Pt rim sites via a Mars-van Krevelen mechanism below the ignition temperature. The build-up of nitrates below the light-off temperatures is faster when CO is present in the feed. Above the light-off temperatures, carbonates replace the nitrates while the catalytic activity remains high.
DRIFTS
Infrared spectroscopy
Supported catalyst
Interfacial reactions
Low-temperature activity
Mars-van Krevlen
Author
Mengqiao Di
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Andreas Schaefer
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Felix Hemmingsson
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Tamsin Bell
Johnson Matthey
Yanyue Feng
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Magnus Skoglundh
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
David Thompsett
Johnson Matthey
Per-Anders Carlsson
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Catalysis Today
0920-5861 (ISSN)
Vol. 426 114394Synergistic development of X-ray techniques and applicable thin oxides for sustainable chemistry
Swedish Research Council (VR) (2017-06709), 2018-04-04 -- 2021-12-31.
KCK - Kompetenscentrum Katalys 2022-2026
Volvo Group (PO:2435702-000), 2022-01-01 -- 2026-12-31.
Preem (KCK2022-2026), 2022-01-01 -- 2026-12-31.
Johnson Matthey (2500123383), 2022-01-01 -- 2026-12-31.
Scania CV AB (Dnr:2021-036543Pnr:52689-1), 2022-01-01 -- 2026-12-31.
Umicore Denmark ApS (KCK2022-2026), 2022-01-01 -- 2026-12-31.
Infrared spectroscopy in time and space
Swedish Research Council (VR) (2019-05528), 2020-01-01 -- 2023-12-31.
Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Materials Science
Subject Categories
Chemical Process Engineering
Atom and Molecular Physics and Optics
Infrastructure
Chalmers Materials Analysis Laboratory
DOI
10.1016/j.cattod.2023.114394