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Title:Sinteza magnetno-izločljivih katalizatorjev na osnovi Ru na ogljiku
Authors:ID Bukovšek, Urška (Author)
ID Gyergyek, Sašo (Mentor) More about this mentor... New window
ID Likozar, Blaž (Comentor)
Files:.pdf MAG_Bukovsek_Urska_2017.pdf (4,45 MB)
MD5: 2F47DD558187936EC161EFCCD72D6424
PID: 20.500.12556/dkum/2f5a3d8f-390c-4c33-bd08-4f1d52c09ea1
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Magistrsko delo predstavlja sintezo magnetno-izločljivih katalizatorjev na osnovi rutenija na ogljikovem nosilcu. Namen magistrskega dela je bil sintetizirati učinkovit katalizator, ki je primerljiv s komercialnim, njegova bistvena prednost pa je ta, da je magneten in ga je možno enostavno separirati z uporabo gradienta zunanjega magnetnega polja. Tekom dela smo sistematično preučevali vpliv postopka priprave na lastnosti Ru/C katalizatorjev. Ogljikove nosilce smo pripravili s hidrotermalno karbonizacijo glukoze v prisotnosti sintetiziranih magnetnih nanodelcev. Delce smo nato žgali v cevni peči, v inertni argonovi atmosferi in jim z mletjem povečali specifično površino. Nadalje smo na njihovo površino sintetizirali Ru nanodelce z redukcijo Ru(acac)3. Izbrane sintetizirane katalizatorje smo testirali za reakcijo hidrogeniranja in deoksigenacije evgenola. Ugotovili smo, da imajo delci, prekriti z ogljikom, žgani pri 750 °C bistveno manj strukturnih defektov grafita, kot pri temperaturi 500 °C, katalizator pa je bolj primerljiv s komercialnim. Nadalje smo ugotovili, da z daljšim časom sinteze v avtoklavu, Ru nanodelci rastejo na površini C nosilca. Prav tako je na površini C nosilca prišlo do nastanka Ru skupkov. Najbolj presenetljiva ugotovitev pa je bila ta, da ima dodatek PVP zelo velik vpliv na celotno sintezo Ru/C katalizatorjev ter na njihovo učinkovitost. PVP je onemogočal vezavo večjih koncentracij Ru(acac)3 na površino C nosilca, brez njegove prisotnosti pa smo lahko koncentracijo Ru(acac)3 kar 5x povečali. Zmanjšal je tudi končno učinkovitost katalizatorjev, Ru nanodelci pa so na površini C nosilca po katalizah močno zrasli. Katalizatorji brez PVP so bili zelo učinkoviti. Najbolj učinkovit je bil katalizator z delci, žganimi pri 500 °C. Bil je tudi bolj učinkovit od katalizatorja z delci, žganimi pri 750 °C ter od komercialnega.
Keywords:magnetno-izločljivi katalizatorji, Ru katalizatorji, C nosilec, hidrogeniranje, deoksigenacija
Place of publishing:Maribor
Publisher:[U. Bukovšek]
Year of publishing:2017
PID:20.500.12556/DKUM-68166 New window
UDC:542.973:66.094.25(043.2)
COBISS.SI-ID:21028374 New window
NUK URN:URN:SI:UM:DK:6ZAJJX8E
Publication date in DKUM:22.11.2017
Views:1551
Downloads:143
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nd/4.0/
Description:Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:11.09.2017

Secondary language

Language:English
Title:Synthesis of magnetically-separable catalysts based on Ru on carbon
Abstract:The master's thesis presents the synthesis of magnetically-separable catalysts, based on ruthenium on carbon support. The purpose of this master’s thesis was to synthesise an effective catalyst, comparable with commercial, with its main advantage that it’s magnetic and can be easily separated using the gradient of external magnetic field. During the work we systematically studied the influence of the preparation conditions on the properties of the Ru/C catalysts. The carbon support was prepared by hydrothermal carbonization of glucose in the presence of the synthesized magnetic nanoparticles. Then, nanopartilces were pyrolysed in a tube furnace in an argon inert atmosphere. We increase the specific surface of nanoparticles by milling. Further, on their surface Ru nanoparticles with Ru(acac)3 reduction were synthesized. Selected synthesized catalysts were tested for the reaction of hydrogenation and deoxygenation of eugenol. In our work we have determined, that carbon coated nanoparticles, pyrolysed at 750 °C is graphitic with less structural defects than at 500 °C and the catalyst is more comparable with commercial. We also found that with a longer time of synthesis in autoclave, Ru nanoparticles grow on the surface of C support. Also, on the surface of C support the Ru clusters were formed. The most surprising finding was that the PVP addition has very strong influence on the entire synthesis of Ru/C catalysts and their effectiveness. PVP inhibited the binding of higher concentrations of Ru(acac)3 on the surface of C support and without its presence, the concentration of Ru(acac)3 could be increased 5x. PVP also reduced the final efficiency of the catalysts and after the catalysis, Ru nanoparticles grew significantly on C support surface. Catalysts without PVP were very effective. The most efficient catalyst had nanoparticles, pyroliysed at 500 °C. It was also more effective that the catalyst with nanoparticles, pyrolysed at 750 °C and the commercial catalyst.
Keywords:magnetically-separable catalysts, Ru catalysts, C support, hydrogenation, deoxygenation


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