1. The role of relative humidity on crystallization of calcium carbonate from calcium acetoacetate precursorAndreja Pondelak, Francesca Rosi, Celeste Maurich, Costanza Miliani, Srečo D. Škapin, Andrijana Sever Škapin, 2019, izvirni znanstveni članek Povzetek: Calcium acetoacetate, Ca(OAcAc)2, was exposed 7, 30 and 365 days to different values of relative humidity (33%, 48%, 75% and 96%) at 40 °C in order to study its transformation to CaCO3. The resulting Ca(OAcAc)2 decomposition and the time dependence of the phase transformations were monitored and critically evaluated by Fourier transform infrared spectroscopy, field emission scanning electron microscopy and X-ray powder diffraction. The impact of relative humidity on CaCO3 polymorph formation was thoroughly assessed. In all of the conditions used and for all ageing periods, the formed crystal structure is found to be vaterite. At the lowest relative humidity (33%), the amorphous CaCO3 remains more or less almost untransformed even after one year of exposure. It is proposed that the reason for the stability of amorphous CaCO3 is due to the limited amount of physisorbed water on the surfaces of the particles, which is considered the driving force for its transformation. However, the carbonation process is faster in the case of the highest humidity (96%). The findings are not only important for better solutions in the field of cultural heritage, but also shed new light on the fundamental mechanism of CaCO3 crystallization. Ključne besede: calcium acetoacetate, relative humidity, carbonation, amorphous carbonate, vaterite, mechanism Objavljeno v DiRROS: 22.11.2023; Ogledov: 286; Prenosov: 135 Celotno besedilo (6,55 MB) Gradivo ima več datotek! Več... |
2. Catalytic lignin valorisation by depolymerisation, hydrogenation, demethylation and hydrodeoxygenation : mechanism, chemical reaction kinetics and transport phenomenaTina Ročnik, Blaž Likozar, Edita Jasiukaityte, Miha Grilc, 2022, pregledni znanstveni članek Ključne besede: lignin, valorisation, depolymerisation, mechanism, kinetic modelling, transport phenomena Objavljeno v DiRROS: 01.07.2022; Ogledov: 533; Prenosov: 383 Celotno besedilo (5,90 MB) Gradivo ima več datotek! Več... |
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5. Photocatalytic, electrocatalytic and photoelectrocatalytic degradation of pharmaceuticals in aqueous media : analytical methods, mechanisms, simulations, catalysts and reactorsBelisa Alcantara Marinho, Luka Suhadolnik, Blaž Likozar, Matej Huš, Živa Marinko, Miran Čeh, 2022, pregledni znanstveni članek Ključne besede: advanced oxidation process, persistent organic compounds, pharmaceutical by- products, degradation mechanism, reactor design, analytical methods Objavljeno v DiRROS: 10.03.2022; Ogledov: 629; Prenosov: 505 Celotno besedilo (11,34 MB) Gradivo ima več datotek! Več... |
6. Catalytic hydrocracking reactions of tetralin biomass tar model compound to benzene, toluene and xylenes (BTX) over metal-modified ZSM-5 in ambient pressure reactorAndrii Kostyniuk, David Bajec, Blaž Likozar, 2022, izvirni znanstveni članek Ključne besede: catalytic hydrocracking reactions, ring opening mechanism, model biomass tar, benzene/toluene/xylenes (BTX), metal-doped HZSM-5 zeolite material, deposited coke deactivation Objavljeno v DiRROS: 10.03.2022; Ogledov: 652; Prenosov: 499 Celotno besedilo (5,34 MB) Gradivo ima več datotek! Več... |
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