Operando characterisation of alumina-supported bimetallic Pd–Pt catalysts during methane oxidation in dry and wet conditions
Open Access
- 16 February 2021
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 54 (17), 174006
- https://doi.org/10.1088/1361-6463/abde67
Abstract
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.Funding Information
- Paul Scherrer Institut (beamtime 20190527)
- Diamond Light Source (SI-19464)
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