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

DOI: 10.1038/s41557-021-00696-0 DOI Help

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)