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Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles

Kothari, Maadhav, Jeon, Yukwon, Miller, David N., Pascui, Andrea Eva, Kilmartin, John, Wails, David, Ramos, Silvia, Chadwick, Alan, Irvine, John T. S. (2021) Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles. Nature Chemistry, 13 . pp. 677-682. ISSN 1755-4330. E-ISSN 1755-4349. (doi:10.1038/s41557-021-00696-0) (KAR id:91826)

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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.

Item Type: Article
DOI/Identification number: 10.1038/s41557-021-00696-0
Uncontrolled keywords: platinum, perovskite systems, stable platinum nanoparticles
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Silvia Ramos Perez
Date Deposited: 30 Nov 2021 22:39 UTC
Last Modified: 04 Jul 2023 14:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/91826 (The current URI for this page, for reference purposes)

University of Kent Author Information

Ramos, Silvia.

Creator's ORCID: https://orcid.org/0000-0003-2725-7706
CReDIT Contributor Roles:

Chadwick, Alan.

Creator's ORCID:
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