Chasing PtOx species in ceria supported platinum during CO oxidation extinction with correlative operando spectroscopic techniques
Artikel i vetenskaplig tidskrift, 2022

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.

Interfacial reaction

Low-temperature activity

Nanoparticles

Infrared spectroscopy

X-ray absorption spectroscopy

Platinum oxides

CO self-poisoning

Författare

Mengqiao Di

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Kerry Simmance

Johnson Matthey

Andreas Schaefer

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Yanyue Feng

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Felix Hemmingsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Magnus Skoglundh Group

Tamsin Bell

Johnson Matthey

David Thompsett

Johnson Matthey

Lucy Idowu Ajakaiye Jensen

Institutionen för Kemiteknik

Sara Blomberg

Institutionen för Kemiteknik

Per-Anders Carlsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Journal of Catalysis

0021-9517 (ISSN) 1090-2694 (eISSN)

Vol. 409 1-11

Ämneskategorier

Oorganisk kemi

Annan kemiteknik

Annan kemi

DOI

10.1016/j.jcat.2022.03.022

Mer information

Senast uppdaterat

2022-04-11