Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution

Dragos Neagu (), Tae-Sik Oh, David N. Miller, Hervé Ménard, Syed M. Bukhari, Stephen R. Gamble, Raymond J. Gorte, John M. Vohs () and John T.S. Irvine ()
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Dragos Neagu: School of Chemistry, University of St Andrews
Tae-Sik Oh: University of Pennsylvania
David N. Miller: School of Chemistry, University of St Andrews
Hervé Ménard: Sasol Technology (UK) Ltd.
Syed M. Bukhari: School of Chemistry, University of St Andrews
Stephen R. Gamble: School of Chemistry, University of St Andrews
Raymond J. Gorte: University of Pennsylvania
John M. Vohs: University of Pennsylvania
John T.S. Irvine: School of Chemistry, University of St Andrews

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Metal particles supported on oxide surfaces are used as catalysts for a wide variety of processes in the chemical and energy conversion industries. For catalytic applications, metal particles are generally formed on an oxide support by physical or chemical deposition, or less commonly by exsolution from it. Although fundamentally different, both methods might be assumed to produce morphologically and functionally similar particles. Here we show that unlike nickel particles deposited on perovskite oxides, exsolved analogues are socketed into the parent perovskite, leading to enhanced stability and a significant decrease in the propensity for hydrocarbon coking, indicative of a stronger metal–oxide interface. In addition, we reveal key surface effects and defect interactions critical for future design of exsolution-based perovskite materials for catalytic and other functionalities. This study provides a new dimension for tailoring particle–substrate interactions in the context of increasing interest for emergent interfacial phenomena.

Date: 2015
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DOI: 10.1038/ncomms9120

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