Open AccessOperando characterisation of alumina-supported bimetallic Pd–Pt catalysts during methane oxidation in dry and wet conditions
Author(s) -
Alex Large,
Jake M. Seymour,
Wilson Quevedo Garzon,
Kanak Roy,
Federica Venturini,
David C. Grinter,
Luca Artiglia,
Emily Brooke,
Martha Briceno de Gutierrez,
Agnes Raj,
Kevin R. J. Lovelock,
Roger A. Bennett,
Tuǧçe Eralp-Erden,
Georg Held
Publication year - 2021
Publication title -
journal of physics. d, applied physics
Language(s) - English
Resource type - Journals
eISSN - 1361-6463
pISSN - 0022-3727
DOI - 10.1088/1361-6463/abde67
Subject(s) - bimetallic strip , x ray photoelectron spectroscopy , palladium , nanomaterial based catalyst , catalysis , anaerobic oxidation of methane , methane , chemistry , oxidation state , inorganic chemistry , stoichiometry , materials science , chemical engineering , organic chemistry , engineering
Near ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) was used to study the chemical states of a range of alumina-supported monometallic Pd and bimetallic Pd–Pt nanocatalysts, under methane oxidation conditions. It has been suggested before that for optimal complete methane oxidation, palladium needs to be in an oxidised state. These experiments, combining NAP-XPS with a broad range of characterisation techniques, demonstrate a clear link between Pt presence, Pd oxidation, and catalyst activity under stoichiometric reaction conditions. Under oxygen-rich conditions this behaviour is less clear, as all of the palladium tends to be oxidised, but there are still benefits to the addition of Pt in place of Pd for complete oxidation of methane.