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

CO self-poisoning

X-ray absorption spectroscopy

Interfacial reaction

Platinum oxides

Infrared spectroscopy

Low-temperature activity

Nanoparticles

Author

Mengqiao Di

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Kerry Simmance

Johnson Matthey

Andreas Schaefer

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Yanyue Feng

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Felix Hemmingsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Magnus Skoglundh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Tamsin Bell

Johnson Matthey

David Thompsett

Johnson Matthey

Lucy Idowu Ajakaiye Jensen

Institutionen för Kemiteknik

Sara Blomberg

Institutionen för Kemiteknik

Per-Anders Carlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Journal of Catalysis

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

Vol. 409 1-11

Synergistic 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.

Umicore Denmark ApS (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.

Subject Categories

Inorganic Chemistry

Other Chemical Engineering

Other Chemistry Topics

Chemical Sciences

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Materials Science

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.jcat.2022.03.022

More information

Latest update

2/22/2024