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

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Author(s)

Maadhav Kothari, Yukwon Jeon, David N. Miller, Andrea Eva Pascui, David Wails, Silvia Ramos, Alan Chadwick, John T. S. Irvine

School/Research organisations

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.
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Original languageEnglish
JournalNature Chemistry
Early online date24 May 2021
DOIs
Publication statusE-pub ahead of print - 24 May 2021

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