1. Chemical and thermogravimetric characterization of chestnut tree biomass waste : towards sustainable resource utilization in the tannin industryJasmina Jusic, Tommaso Giannoni, Florian Zikeli, Swati Tamantini, Valeria Pierpaoli, Marco Barbanera, Miha Grilc, Giorgio Tofani, Manuela Romagnoli, 2025, izvirni znanstveni članek Povzetek: Sweet chestnut (Castanea sativa Mill.) is a key European species, with Italy playing a crucial role in its forest cover and timber production. Chestnut wood processing generates significant residues,with approximately 40% waste at the sawmill stage alone. A major portion of this waste, including that from fruit tree plantations, is used in the tannin extraction industry, exemplifying a circular economy model. This study analyzed exhausted chestnut wood from the tannin industry, virgin wood (prior to tannin extraction), detannized wood (after tannin removal), and chestnut bark, which is separated before the tannin extraction process. The study assessed both the chemical composition and extractives content of the samples. FTIR analysis revealed structural modifications, with key spectral shifts (1640, 1420, 1240, and 1120 cm⁻¹) indicating enhanced aromatic conjugation after extractive removal. TGA analysis showed that detannized wood degraded faster at high temperatures, suggesting better combustibility and biofuel potential, while lignin-rich residues demonstrated greater thermal stability, making them suitable for insulation and biocomposite applications. These findings support optimizing waste utilization, reducing environmental impact, and enhancing resource efficiency. By promoting innovative uses for tannin industry byproducts, this research contributes to sustainability and strengthens circular economy strategies within the forest-wood sector.
Objavljeno v DiRROS: 01.04.2026; Ogledov: 187; Prenosov: 43
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5. The effect of carbon support on rhenium-catalyzed glyceric acid deoxydehydration into biobased acrylic acidMaja Gabrič, Brigita Hočevar, Anej Blažič, Janvit Teržan, Sašo Gyergyek, Blaž Likozar, Miha Grilc, 2026, izvirni znanstveni članek Ključne besede: carbon support, bio-based acrylic acid, glyceric acid, deoxydehydration, rhenium oxides catalysts
Objavljeno v DiRROS: 02.02.2026; Ogledov: 355; Prenosov: 241
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6. Synthesis of a magnetically heatable ceria–supported ruthenium catalyst via deposition of nanocrystalline ceria on silica-coated magnetic iron–oxide nanoparticlesNina Kosi Križaj, Jakov-Stjepan Pavelić, Miha Grilc, Sašo Gyergyek, Darko Makovec, 2026, izvirni znanstveni članek Povzetek: 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.
Ključne besede: nanotechnology, catalyst synthesis, ceria, magnetic nanoparticles, catalysis by magnetic heating, biomass valorisation, transmission electron microscopy
Objavljeno v DiRROS: 14.01.2026; Ogledov: 374; Prenosov: 254
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9. A review of electrified methane conversion : utilizing electrocatalysis, plasma, electric-field and electro-thermal technologiesAlen Rupnik, Igor Shlyapnikov, Miha Grilc, Gleb Veryasov, David Bajec, Blaž Likozar, 2025, pregledni znanstveni članek Objavljeno v DiRROS: 02.09.2025; Ogledov: 590; Prenosov: 333
Celotno besedilo (2,70 MB)
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