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Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

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

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Exsolution of surface and bulk nanoparticles in perovskites has been recently employed in chemical looping methane partial oxidation because of the emergent materials’ properties such as oxygen capacity, redox stability, durability, coke resistance and enhanced activity. Here we attempt to further lower the temperature of methane conversion by complementing exsolution with infiltration. We prepare an endo/exo-particle system using exsolution and infiltrate it with minimal amount of Rh (0.1 wt%) in order to functionalize the surface and induce low temperature activity. We achieve a temperature decrease by almost 220 °C and an increase of the activity up to 40%. We also show that the initial microstructure of the perovskite plays a key role in controlling nanoparticle anchorage and carbon deposition. Our results demonstrate that microstructure tuning and surface functionalization are important aspects to consider when designing materials for redox cycling applications

Publication metadata

Author(s): Kousi K, Neagu D, Metcalfe IS

Publication type: Article

Publication status: Published

Journal: Catalysts

Year: 2020

Volume: 10

Issue: 5

Online publication date: 25/04/2020

Acceptance date: 07/04/2020

Date deposited: 14/05/2020

ISSN (electronic): 2073-4344

Publisher: MDPI AG

URL: https://doi.org/10.3390/catal10050468

DOI: 10.3390/catal10050468

Data Access Statement: https://doi.org/10.25405/data.ncl.12090822.v1

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