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Article

Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO2 Reforming of Methane

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Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, Greece
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Energy and Environment Institute, University of Hull, Hull HU6 7RX, UK
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Department of Chemical and Process Engineering, University of Surrey, Guildford GU2 7XH, UK
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Department of Chemical Engineering, University of Patras, GR 265 04 Patras, Greece
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Energy & Bioproducts Research Institute (EBRI), Aston University, Aston Triangle, Birmingham B4 7ET, UK
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Department of Chemistry, Cambridge University, Cambridge CB2 1EW, UK
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Institute of Petroleum Research—Foundation for Research and Technology-Hellas (IPR-FORTH), 73100 Chania, Crete, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Sónia Carabineiro
Nanomaterials 2021, 11(11), 2880; https://doi.org/10.3390/nano11112880
Received: 8 October 2021 / Revised: 21 October 2021 / Accepted: 25 October 2021 / Published: 28 October 2021
(This article belongs to the Section Environmental Nanoscience and Nanotechnology)
The production of syngas (H2 and CO)—a key building block for the manufacture of liquid energy carriers, ammonia and hydrogen—through the dry (CO2−) reforming of methane (DRM) continues to gain attention in heterogeneous catalysis, renewable energy technologies and sustainable economy. Here we report on the effects of the metal oxide support (γ-Al2O3, alumina-ceria-zirconia (ACZ) and ceria-zirconia (CZ)) on the low-temperature (ca. 500–750 C) DRM activity, selectivity, resistance against carbon deposition and iridium nanoparticles sintering under oxidative thermal aging. A variety of characterization techniques were implemented to provide insight into the factors that determine iridium intrinsic DRM kinetics and stability, including metal-support interactions and physicochemical properties of materials. All Ir/γ-Al2O3, Ir/ACZ and Ir/CZ catalysts have stable DRM performance with time-on-stream, although supports with high oxygen storage capacity (ACZ and CZ) promoted CO2 conversion, yielding CO-enriched syngas. CZ-based supports endow Ir exceptional anti-sintering characteristics. The amount of carbon deposition was small in all catalysts, however decreasing as Ir/γ-Al2O3 > Ir/ACZ > Ir/CZ. The experimental findings are consistent with a bifunctional reaction mechanism involving participation of oxygen vacancies on the support’s surface in CO2 activation and carbon removal, and overall suggest that CZ-supported Ir nanoparticles are promising catalysts for low-temperature dry reforming of methane (LT-DRM). View Full-Text
Keywords: greenhouse gases; dry reforming of methane; carbon dioxide; alumina-ceria-zirconia mixed oxides; iridium nanoparticles; coking-resistant catalysts; sintering-resistant catalysts; syngas production greenhouse gases; dry reforming of methane; carbon dioxide; alumina-ceria-zirconia mixed oxides; iridium nanoparticles; coking-resistant catalysts; sintering-resistant catalysts; syngas production
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MDPI and ACS Style

Nikolaraki, E.; Goula, G.; Panagiotopoulou, P.; Taylor, M.J.; Kousi, K.; Kyriakou, G.; Kondarides, D.I.; Lambert, R.M.; Yentekakis, I.V. Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO2 Reforming of Methane. Nanomaterials 2021, 11, 2880. https://doi.org/10.3390/nano11112880

AMA Style

Nikolaraki E, Goula G, Panagiotopoulou P, Taylor MJ, Kousi K, Kyriakou G, Kondarides DI, Lambert RM, Yentekakis IV. Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO2 Reforming of Methane. Nanomaterials. 2021; 11(11):2880. https://doi.org/10.3390/nano11112880

Chicago/Turabian Style

Nikolaraki, Ersi, Grammatiki Goula, Paraskevi Panagiotopoulou, Martin J. Taylor, Kalliopi Kousi, Georgios Kyriakou, Dimitris I. Kondarides, Richard M. Lambert, and Ioannis V. Yentekakis. 2021. "Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO2 Reforming of Methane" Nanomaterials 11, no. 11: 2880. https://doi.org/10.3390/nano11112880

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