Support induced effects on the Ir nanoparticles activity, selectivity and stability performance under CO2 reforming of methaneSupport induced effects on the Ir nanoparticles activity, selectivity and stability performance under CO2 reforming of methane Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2022-09-222021enThis research has been co-financed by the European Union and Greek national funds through the operational program ‘Regional Excellence’ and the operational program ‘Competitiveness, Entrepreneurship and Innovation’, under the call “RESEARCH-CREATE-INNOVATE” (Project code: T2EΔK-00955).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). http://creativecommons.org/licenses/by/4.0/Nanomaterials1111Nikolaraki_et_al_Nanomaterials_11(11)_2021.pdfChania [Greece]Library of TUC2022-09-22application/pdf4.6 MBfree Nikolaraki Ersi Νικολαρακη Ερση Goula Grammatiki Panagiotopoulou Paraskevi Παναγιωτοπουλου Παρασκευη Taylor Martin Kousi Kalliopi Kyriakou Georgios Kondarides Dimitris I. Lambert Richard M. Gentekakis Ioannis Γεντεκακης Ιωαννης MDPI Greenhouse gases Dry reforming of methane Carbon dioxide Alumina-ceria-zirconia mixed oxides Iridium nanoparticles Coking-resistant catalysts Sintering-resistant catalysts Syngas production