| Title: | Synthesis of a magnetically heatable ceria–supported ruthenium catalyst via deposition of nanocrystalline ceria on silica-coated magnetic iron–oxide nanoparticles |
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| Authors: | ID Kosi Križaj, Nina, Institut "Jožef Stefan" (Author)
ID Pavelić, Jakov-Stjepan (Author)
ID Grilc, Miha (Author)
ID Gyergyek, Sašo, Institut "Jožef Stefan" (Author)
ID Makovec, Darko, Institut "Jožef Stefan" (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S002236972600003X?via%3Dihub
 PDF - Presentation file, download (11,51 MB)
MD5: 4C57A59FE738F78C59EBC984EF75F286
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | We report the synthesis of a ceria-based catalyst support containing embedded magnetic iron–oxide nanoparticles (IONPs) that enable heating under a high-frequency alternating magnetic field. The ≈11 nm IONPs, synthesized by co-precipitation of Fe2+/Fe3+ ions at room temperature, were coarsened to ≈18 nm through subsequent hydrothermal treatment at 120 ◦C and then coated with a ≈2 nm silica layer. The catalyst support was prepared by depositing nanocrystalline ceria (CeO2) onto the IONPs via controlled precipitation of Ce3+ ions in the presence of hexamethylenetetramine (HMTA) in aqueous suspension. When deposited directly on the iron oxide, ceria formed small agglomerates of ≈10 nm octahedral nanocrystallites, whereas deposition on silicacoated IONPs produced a homogeneous 3–6 nm-thick shell composed of ≈3 nm globular crystallites. Special attention was given to elucidating the mechanism of shell formation. The magnetic catalyst was obtained by precipitating Ru nanoparticles (1–2 nm) onto the ceria support. Morpho-structural characterization was performed by XRD, TEM, and aberration-corrected STEM. Static and dynamic magnetization measurements at room temperature were used to assess the magnetic and heating performance. At low field amplitudes (<15 mT), catalysts prepared with IONPs of both sizes exhibited similar specific absorption rates, whereas at higher amplitudes the larger IONPs demonstrated superior heating efficiency. The catalytic performance was demonstrated in the magnetically heated hydrogenation of the bio-based compound 5-(hydroxymethyl)furfural to 2,5-bis (hydroxymethyl)furan, showing high activity, 100 % selectivity, and excellent stability upon recycling. |
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| Keywords: | nanotechnology, catalyst synthesis, ceria, magnetic nanoparticles, catalysis by magnetic heating, biomass valorisation, transmission electron microscopy |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 23.10.2025 |
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| Article acceptance date: | 05.01.2026 |
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| Publication date: | 06.01.2026 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 1-13 |
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| Numbering: | Vol. 212 [article no.] 113517 |
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| Source: | Nizozemska |
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| PID: | 20.500.12556/DiRROS-25270  |
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| UDC: | 620.3 |
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| ISSN on article: | 1879-2553 |
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| DOI: | 10.1016/j.jpcs.2026.113517 |
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| COBISS.SI-ID: | 264674051 |
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| Note: | Soavtorji: Jakov-Stjepan Pavelić, Miha Grilc, Sašo Gyergyek, Darko Makovec;
Nasl. z nasl. zaslona;
Opis vira z dne 14. 1. 2026;
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| Publication date in DiRROS: | 14.01.2026 |
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| Views: | 125 |
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| Downloads: | 85 |
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