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Enhanced Stability of Iridium Nanocatalysts via Exsolution for the CO2 Reforming of Methane

Lookup NU author(s): 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

© 2023 The Authors. Published by American Chemical Society. The reforming reactions of greenhouse gases require catalysts with high reactivity, coking resistance, and structural stability for efficient and durable use. Among the possible strategies, exsolution has been shown to demonstrate the requirements needed to produce appropriate catalysts for the dry reforming of methane, the conversion of which strongly depends on the choice of active species, its interaction with the support, and the catalyst size and dispersion properties. Here, we exploit the exsolution approach, known to produce stable and highly active nanoparticle-supported catalysts, to develop iridium-nanoparticle-decorated perovskites and apply them as catalysts for the dry reforming of methane. By studying the effect of several parameters, we tune the degree of exsolution, and consequently the catalytic activity, thereby identifying the most efficient sample, 0.5 atomic % Ir-BaTiO3, which showed 82% and 86% conversion of CO2 and CH4, respectively. By comparison with standard impregnated catalysts (e.g., Ir/Al2O3), we benchmark the activity and stability of our exsolved systems. We find almost identical conversion and syngas rates of formation but observe no carbon deposition for the exsolved samples after catalytic testing; such deposition was significant for the traditionally prepared impregnated Ir/Al2O3, with almost 30 mgC/gsample measured, compared to 0 mgC/gsample detected for the exsolved system. These findings highlight the possibility of achieving in a single step the mutual interaction of the parameters enhancing the catalytic efficiency, leading to a promising pathway for the design of catalysts for reforming reactions.


Publication metadata

Author(s): Cali E, Saini S, Kerherve G, Skinner WS, Metcalfe IS, Payne DJ, Kousi K

Publication type: Review

Publication status: Published

Journal: ACS Applied Nano Materials

Year: 2024

Volume: 7

Issue: 16

Pages: 18398-18409

Print publication date: 23/08/2024

Online publication date: 01/12/2023

Acceptance date: 06/11/2023

ISSN (electronic): 2574-0970

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsanm.3c04126

DOI: 10.1021/acsanm.3c04126

Data Access Statement: Supporting research data for this article may be accessed at 10.15126/surreydata.900802


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