20.500.12556/DiRROS-25270 Synthesis of a magnetically heatable ceria–supported ruthenium catalyst via deposition of nanocrystalline ceria on silica-coated magnetic iron–oxide nanoparticles 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. nanotechnology catalyst synthesis ceria magnetic nanoparticles catalysis by magnetic heating biomass valorisation transmission electron microscopy sinteza katalizatorja cerijev oksid magnetni nanodelci kataliza z magnetnim segrevanjem valorizacija biomase presevna elektronska mikroskopija true false true Elsevier Nizozemska Angleški jezik Slovenski jezik Neznano 2026-01-14 14:06:43 2026-01-14 14:06:43 2026-01-15 03:49:01 0000-00-00 00:00:00 2026 0 0 Soavtorji: Jakov-Stjepan Pavelić, Miha Grilc, Sašo Gyergyek, Darko Makovec; Nasl. z nasl. zaslona; Opis vira z dne 14. 1. 2026; str. 1-13 Vol. 212 [article no.] 113517 Maj 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-10-23 2026-01-05 2026-01-06 620.3 1879-2553 10.1016/j.jpcs.2026.113517 264674051 https://www.sciencedirect.com/science/article/pii/S002236972600003X?via%3Dihub 1 e1cd6861-f149-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38163 RAZ_Kosi_Krizaj_Nina_2026.pdf RAZ_Kosi_Krizaj_Nina_2026.pdf 1 4C57A59FE738F78C59EBC984EF75F286 4d094d35bd152573c7614f9d536ae952efc4f4ae4c692136710d3de80af10f53 a892b5a9-f14a-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38170 Institut Jožef Stefan 0 0 0