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Title:Magnetno segrevanje magnetnih nanokompozitov za pripravo večelementnih katalizatorjev : magistrsko delo
Authors:ID Murovec, Amadej (Author)
ID Gyergyek, Sašo (Mentor) More about this mentor... New window
ID Grilc, Miha (Comentor)
Files:.pdf Magnetno_segrevanje_magnetnih_nanokompozitov_za_pripravo_vecelementnih_katalizatorjev.pdf (7,22 MB)
MD5: C4D9278BDA2F60F45ACE14DA8E4F1B93
PID: 20.500.12556/dkum/97fe366a-9bed-42dd-bc66-e03774c5887c
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:rutenijevi katalizatorji, rutenij nikljevi katalizatorji, magnetno segrevanje, sinteza katalizatorjev, 5-hidroksimetilfurfural, reakcijska kinetika
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[A. Murovec]
Year of publishing:2022
Number of pages:1 spletni vir (1 datoteka PDF (XI, 76 f.))
PID:20.500.12556/DKUM-81120 New window
UDC:544.478.1.032.53(043.2)
COBISS.SI-ID:96984579 New window
Publication date in DKUM:31.01.2022
Views:1060
Downloads:104
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:11.01.2022

Secondary language

Language:English
Title:Magnetic heating of magnetic nanocomposites for synthesis of multielemental catalysts
Abstract: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.
Keywords:ruthenium catalysts, ruthenium nickel catalysts, magnetic heating, catalysts synthesis, 5-hydroxymethylfurfural, reaction kinetics


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