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Exsolved Nickel Nanoparticles Acting as Oxygen Storage Reservoirs and Active Sites for Redox CH4 Conversion

Lookup NU author(s): Dr Kelly Kousi, Dr Dragos Neagu, Leonidas Bekris, Professor Ian Metcalfe

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2019.

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Abstract

The growing demand for H2 and syngas requires the development of new, more efficient processes and materials for their production, especially from CH4 that is a widely available resource. One process that has recently received increased attention is chemical looping CH4 partial oxidation, which, however, poses stringent requirements on material design, including fast oxygen exchange and high storage capacity, high reactivity toward CH4 activation, and resistance to carbon deposition, often only met by composite materials. Here we design a catalytically active material for this process, on the basis of exsolution from a porous titanate. The exsolved Ni particles act as both oxygen storage centers and as active sites for CH4 conversion under redox conditions. We control the extent of exsolution, particle size, and population of Ni particles in order to tune the oxygen capacity, reactivity, and stability of the system and, at the same time, obtain insights into parameters affecting and controlling exsolution


Publication metadata

Author(s): Otto S, Kousi K, Neagu D, Bekris L, Janek J, Metcalfe I

Publication type: Article

Publication status: Published

Journal: Applied Energy Materials

Year: 2019

Volume: 10

Issue: 2

Pages: 7288-7298

Print publication date: 28/10/2019

Online publication date: 26/09/2019

Acceptance date: 26/09/2019

Date deposited: 27/01/2020

ISSN (electronic): 2574-0962

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsaem.9b01267

DOI: 10.1021/acsaem.9b01267

Data Source Location: https://doi.org/10.25405/data.ncl.8323601.v1


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