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Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles
DOI:
10.1038/s41557-021-00696-0
Authors:
Maadhav
Kothari
(University of St Andrews)
,
Yukwon
Jeon
(University of St Andrews; Yonsei University)
,
David N.
Miller
(University of St Andrews)
,
Andrea Eva
Pascui
(Johnson Matthey Technology Centre)
,
John
Kilmartin
(Johnson Matthey Technology Centre)
,
David
Wails
(Johnson Matthey Technology Centre)
,
Silvia
Ramos
(University of Kent)
,
Alan
Chadwick
(University of Kent)
,
John T. S.
Irvine
(University of St Andrews)
Co-authored by industrial partner:
Yes
Type:
Journal Paper
Journal:
Nature Chemistry
, VOL 337
State:
Published (Approved)
Published:
May 2021
Diamond Proposal Number(s):
14239
Abstract: Platinum functions exceptionally well as a nanoparticulate catalyst in many important fields, such as in the removal of atmospheric pollutants, but it is scarce, expensive and not always sufficiently durable. Here, we report a perovskite system in which 0.5 wt% Pt is integrated into the support and its subsequent conversion through exsolution to achieve a resilient catalyst. Owing to the instability of most Pt oxides at high temperatures, a thermally stable platinum oxide precursor, barium platinate, was used to preserve the platinum as an oxide during the solid-state synthesis in an approach akin to the Trojan horse legend. By tailoring the procedure, it is possible to produce a uniform equilibrated structure with active emergent Pt nanoparticles strongly embedded in the perovskite surface that display better CO oxidation activity and stability than those of conventionally prepared Pt catalysts. This catalyst was further evaluated for a variety of reactions under realistic test environments—CO and NO oxidation, diesel oxidation catalysis and ammonia slip reactions were investigated.
Subject Areas:
Materials,
Chemistry
Instruments:
B18-Core EXAFS
Added On:
27/05/2021 08:25
Discipline Tags:
Automotive
Physical Chemistry
Catalysis
Chemistry
Materials Science
Engineering & Technology
Nanoscience/Nanotechnology
Perovskites
Metallurgy
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)
Extended X-ray Absorption Fine Structure (EXAFS)
X-ray Absorption Near Edge Structure (XANES)