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Support induced effects on the Ir nanoparticles activity, selectivity and stability performance under CO2 reforming of methane

Nikolaraki Ersi, Goula Grammatiki, Panagiotopoulou Paraskevi, Taylor Martin, Kousi Kalliopi, Kyriakou Georgios, Kondarides Dimitris I., Lambert Richard M., Gentekakis Ioannis

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URIhttp://purl.tuc.gr/dl/dias/D178ED84-50B2-4896-B955-7EF1B3A27752-
Identifierhttps://doi.org/10.3390/nano11112880-
Identifierhttps://www.mdpi.com/2079-4991/11/11/2880/htm-
Languageen-
Extent24 pagesen
TitleSupport induced effects on the Ir nanoparticles activity, selectivity and stability performance under CO2 reforming of methaneen
CreatorNikolaraki Ersien
CreatorΝικολαρακη Ερσηel
CreatorGoula Grammatikien
CreatorPanagiotopoulou Paraskevien
CreatorΠαναγιωτοπουλου Παρασκευηel
CreatorTaylor Martinen
CreatorKousi Kalliopien
CreatorKyriakou Georgiosen
CreatorKondarides Dimitris I.en
CreatorLambert Richard M.en
CreatorGentekakis Ioannisen
CreatorΓεντεκακης Ιωαννηςel
PublisherMDPIen
Content SummaryThe 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). en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2022-09-22-
Date of Publication2021-
SubjectGreenhouse gasesen
SubjectDry reforming of methaneen
SubjectCarbon dioxideen
SubjectAlumina-ceria-zirconia mixed oxidesen
SubjectIridium nanoparticlesen
SubjectCoking-resistant catalystsen
SubjectSintering-resistant catalystsen
SubjectSyngas productionen
Bibliographic CitationE. Nikolaraki, G. Goula, P. Panagiotopoulou, M. J. Taylor, K. Kousi, G. Kyriakou, D. I. Kondarides, R. M. Lambert, and I. V. Yentekakis, “Support induced effects on the Ir nanoparticles activity, selectivity and stability performance under CO2 reforming of methane,” Nanomaterials, vol. 11, no. 11, Oct. 2021, doi: 10.3390/nano11112880.en

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