20.500.12556/DKUM-81120 Magnetno segrevanje magnetnih nanokompozitov za pripravo večelementnih katalizatorjev magistrsko delo Magnetic heating of magnetic nanocomposites for synthesis of multielemental catalysts Namen magistrskega dela je bil preučiti vpliv pogojev magnetnega segrevanja na nastanek večelementnih katalizatorjev, preučiti katalizatorje z uporabo presevne elektronske mikroskopije in drugih relevantnih metod ter testirati aktivnost katalizatorjev v tehnološko relevantnih reakcijah. S hidrotermalno sintezo Fe2+ in Fe3+ sem pripravil suspenzijo magnetnih nanodelcev, katerih površina je bila v nadaljevanju funkcionalizirana z adsorpcijo citronske kisline v namen povečanja stabilnosti suspenzije. Z gravimetrično analizo je bila ocenjena dobra stabilnost suspenzije in določen delež na magnetnih nanodelcih adsorbirane citronske kisline – 3 %. Ogljikova podlaga je bila pripravljena s hidrotermalno karbonizacijo raztopine glukoze v prisotnosti suspenzije magnetnih nanodelcev. Pripravljena ogljikova podlaga je bila žgana in mleta v namen povečanja primernosti za uporabo v katalitske namene, z meritvijo magnetnih lastnosti pa je bilo določeno feromagnetno obnašanje in primernost za segrevanje v zunanjem izmeničnem magnetnem polju na račun histereznih izgub. Na pripravljeno ogljikovo podlago so bili z različnimi sinteznimi tehnikami (precipitacija, impregnacija, solvotermalna sinteza in koprecipitacija) nanešeni katalitsko aktivni nanodelci rutenija in zlitinski nanodelci rutenij niklja. Nanešeni nanodelci so bili aktivirani z različnimi načini redukcije. S TEM analizo je bilo ugotovljeno, da so najmanjši in najbolj homogeno distribuirani rutenijevi delci pridobljeni s precipitacijo, največji in pogosto aglomerirani pa so zlitinski nanodelci, pridobljeni s koprecipitacijo. Aktivnost katalizatorjev je bila testirana v tehnološko pomembni reakciji hidrodeoksigenacije 5-hidroksimetilfurfurala, kjer je bilo ugotovljeno, da so najaktivnejši katalizatorji pridobljeni s precipitacijo, najmanj pa tisti, pridobljeni s koprecipitacijo. The purpose of this master's thesis was to study the influence of magnetic heating conditions on the formation of multielement catalysts, to examine catalysts using transmission electron microscopy and other relevant methods and to test the activity of catalysts in technologically relevant reactions. The suspension of magnetic nanoparticles was prepared with the hydrothermal synthesis of Fe2+ and Fe3+. The surface of magnetic nanoparticles was further functionalized by the adsorption of citric acid in order to increase the stability of the suspension, which was evaluated by gravimetric analysis as stable and the fraction of adsorbed citric acid was determined as 3 %. The carbon support was synthesized with hydrothermal carbonization of the glucose solution in the presence of magnetic nanoparticle suspension. The carbon support thus prepared was calcined and ground to increase suitability for catalytic use. Ferromagnetic behaviour was determined by measuring magnetic properties of the carbon support, which was recognized as suitable for heating in an external alternating magnetic field due to hysteresis losses. Catalytically active ruthenium nanoparitcles and ruthenium nickel alloy nanoparticles were applied to the prepared carbon support with various synthetic techniques (precipitation, impregnation, solvothermal synthesis and coprecipitation). The applied nanoparticles were activated with various reduction techniques. It was determined with the TEM analysis that the smallest and most homogeneously distributed ruthenium nanoparticles are obtained with the precipitation technique, the biggest and often agglomerated ones, on the other hand, are obtained with the coprecipitation technique. The activity of the catalysts was tested in a technologically relevant hydrodeoxygenation reaction of 5-hydroxymethylfurfural, where it was found that the most active catalyst were obtained with the precipitation technique and the least active ones with the coprecipitation technique. rutenijevi katalizatorji rutenij nikljevi katalizatorji magnetno segrevanje sinteza katalizatorjev 5-hidroksimetilfurfural reakcijska kinetika ruthenium catalysts ruthenium nickel catalysts magnetic heating catalysts synthesis 5-hydroxymethylfurfural reaction kinetics true true false [A. Murovec] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2022-01-11 10:22:07 2022-01-31 09:12:09 2022-04-01 10:06:57 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XI, 76 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.478.1.032.53(043.2) 96984579 Magnetno_segrevanje_magnetnih_nanokompozitov_za_pripravo_vecelementnih_katalizatorjev.pdf Magnetno_segrevanje_magnetnih_nanokompozitov_za_pripravo_vecelementnih_katalizatorjev.pdf 1 C4D9278BDA2F60F45ACE14DA8E4F1B93 886d11c4eb500930f28ddef023d9194fcabef43f8b18e94ea914d79133e11a1f 53a47afa-af47-11ec-a6b5-00155d000105 20.500.12556/dkum/97fe366a-9bed-42dd-bc66-e03774c5887c https://dk.um.si/Dokument.php?lang=slv&id=157008 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0