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

被引：16

作者：

Di, Mengqiao ^{[1
]}

Simmance, Kerry ^{[2
]}

Schaefer, Andreas ^{[1
]}

Feng, Yanyue ^{[1
]}

Hemmingsson, Felix ^{[1
]}

Skoglundh, Magnus ^{[1
]}

Bell, Tamsin ^{[2
]}

Thompsett, David ^{[2
]}

Jensen, Lucy Idowu Ajakaiye ^{[3
]}

Blomberg, Sara ^{[3
]}

Carlsson, Per-Anders ^{[1
]}

机构：

[1] Chalmers Univ Technol, Competence Ctr Catalysis, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden

[2] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

[3] Lund Univ, Dept Chem Engn, S-22100 Lund, Sweden

来源：

JOURNAL OF CATALYSIS | 2022年 / 409卷

关键词：

Nanoparticles; Platinum oxides; CO self-poisoning; Interfacial reaction; Low-temperature activity; X-ray absorption spectroscopy; Infrared spectroscopy; IN-SITU FTIR; PT/CEO2; CATALYST; OXYGEN; MODEL; ADSORPTION; PERFORMANCE; PALLADIUM; SURFACES; PT/AL2O3; KINETICS;

D O I：

10.1016/j.jcat.2022.03.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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-O coordination. During the protracted catalytic extinction, the CO coverage builds up gradually while the Pt oxidation state and Pt-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.(C) 2022 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

引用

页码：1 / 11

页数：11

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