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Chasing PtOx species in ceria supported platinum during CO oxidation extinction with correlative operando spectroscopic techniques

Di, Mengqiao ; Simmance, Kerry ; Schaefer, Andreas LU ; Feng, Yanyue ; Hemmingsson, Felix ; Skoglundh, Magnus ; Bell, Tamsin ; Thompsett, David ; Ajakaiye Jensen, Lucy Idowu LU and Blomberg, Sara LU , et al. (2022) In Journal of Catalysis 409. p.1-11
Abstract

Industrially relevant, highly dispersed, Pt/ceria and reference Pt/alumina catalysts with narrow Pt particle size distributions have been prepared, characterised ex situ and studied for CO oxidation by operando infrared and X-ray absorption spectroscopy. At high CO conversions, spectator CO ad-species on ionic platinum are observed while the CO oxidation proceeds on Pt particles in a high oxidation state exhibiting significant Pt[sbnd]O coordination. During the protracted catalytic extinction, the CO coverage builds up gradually while the Pt oxidation state and Pt[sbnd]O coordination remain high because of interactions with ceria. The observed CO oxidation at high CO coverage is suggested to involve sites at the platinum-ceria boundary... (More)

Industrially relevant, highly dispersed, Pt/ceria and reference Pt/alumina catalysts with narrow Pt particle size distributions have been prepared, characterised ex situ and studied for CO oxidation by operando infrared and X-ray absorption spectroscopy. At high CO conversions, spectator CO ad-species on ionic platinum are observed while the CO oxidation proceeds on Pt particles in a high oxidation state exhibiting significant Pt[sbnd]O coordination. During the protracted catalytic extinction, the CO coverage builds up gradually while the Pt oxidation state and Pt[sbnd]O coordination remain high because of interactions with ceria. The observed CO oxidation at high CO coverage is suggested to involve sites at the platinum-ceria boundary that cannot be CO self-poisoned. This behaviour is in stark contrast to that of Pt/alumina, which shows removal of platinum oxides formed during CO oxidation and the classical drop in catalytic activity caused by rapid CO self-poisoning when reaching a critical temperature.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CO self-poisoning, Infrared spectroscopy, Interfacial reaction, Low-temperature activity, Nanoparticles, Platinum oxides, X-ray absorption spectroscopy
in
Journal of Catalysis
volume
409
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85127315088
ISSN
0021-9517
DOI
10.1016/j.jcat.2022.03.022
language
English
LU publication?
yes
id
d507677e-1e9b-4111-b512-634ca597b705
date added to LUP
2022-06-03 14:51:23
date last changed
2023-12-20 03:04:06
@article{d507677e-1e9b-4111-b512-634ca597b705,
  abstract     = {{<p>Industrially relevant, highly dispersed, Pt/ceria and reference Pt/alumina catalysts with narrow Pt particle size distributions have been prepared, characterised ex situ and studied for CO oxidation by operando infrared and X-ray absorption spectroscopy. At high CO conversions, spectator CO ad-species on ionic platinum are observed while the CO oxidation proceeds on Pt particles in a high oxidation state exhibiting significant Pt[sbnd]O coordination. During the protracted catalytic extinction, the CO coverage builds up gradually while the Pt oxidation state and Pt[sbnd]O coordination remain high because of interactions with ceria. The observed CO oxidation at high CO coverage is suggested to involve sites at the platinum-ceria boundary that cannot be CO self-poisoned. This behaviour is in stark contrast to that of Pt/alumina, which shows removal of platinum oxides formed during CO oxidation and the classical drop in catalytic activity caused by rapid CO self-poisoning when reaching a critical temperature.</p>}},
  author       = {{Di, Mengqiao and Simmance, Kerry and Schaefer, Andreas and Feng, Yanyue and Hemmingsson, Felix and Skoglundh, Magnus and Bell, Tamsin and Thompsett, David and Ajakaiye Jensen, Lucy Idowu and Blomberg, Sara and Carlsson, Per Anders}},
  issn         = {{0021-9517}},
  keywords     = {{CO self-poisoning; Infrared spectroscopy; Interfacial reaction; Low-temperature activity; Nanoparticles; Platinum oxides; X-ray absorption spectroscopy}},
  language     = {{eng}},
  pages        = {{1--11}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Catalysis}},
  title        = {{Chasing PtO<sub>x</sub> species in ceria supported platinum during CO oxidation extinction with correlative operando spectroscopic techniques}},
  url          = {{http://dx.doi.org/10.1016/j.jcat.2022.03.022}},
  doi          = {{10.1016/j.jcat.2022.03.022}},
  volume       = {{409}},
  year         = {{2022}},
}