| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font
First page > Show document

Show document Help

Title:Katalitska učinkovitost kovinskih katalizatorjev na konvencionalnih TiO2 nosilcih : magistrsko delo
Authors:ID Ćeranić, Martin (Author)
ID Pečar, Darja (Mentor) More about this mentor... New window
ID Goršek, Andreja (Comentor)
Files:.pdf MAG_Ceranic_Martin_2022.pdf (4,15 MB)
MD5: 1C795655833DC52A8C3561192E1E25CA
PID: 20.500.12556/dkum/c60f3f7e-ad7d-4517-926a-4fcac1893b39
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V okviru magistrske naloge smo sintetizirali katalizatorje na osnovi TiO2 z aktivno soljo AlCl3. Ti katalizatorji so bili aktivni in s tem tudi primerni za reakcijo med metanolom in miristinsko kislino. Sintetizirani katalizatorji so imeli različna masna razmerja med TiO2 in AlCl3. Katalizatorje smo pripravili tako, da smo s postopkom mokre impregnacije na nosilec TiO2 vezali AlCl3. Učinkovitost katalizatorja smo preverjali na reakciji esterifikacije miristinske kisline z metanolom v reaktorskem sistemu EasyMax 102. Reakcijo smo izvajali v majhnih reaktorjih, podobnih nekoliko večjim epruvetam, ki smo jih lahko zamašili z zamaškom. Reakcije smo izvajali z različnimi količinami sintetiziranega katalizatorja, m = (0,05, 0,075, 0,1, 0,2, 0,3 in 0,4) g. Nato smo pripravili raztopino, ki je vsebovala 0,15 g miristinske kisline, ki smo jo raztopili v metanolu in v 10 mL bučki dopolnili do oznake. Vzorce smo jemali iz reaktorskega sistema v različnih časovnih intervalih t = (¼, ½ , ¾, 1, 1,5, 2, 3, 4 in 5) h. Po končanih meritvah smo vzorce analizirali na napravi HPLC z UV-VIS detektorjem. V magistrskem delu smo za karakterizacijo katalizatorjev uporabili temperaturno programirano desorpcijo (TPD), infrardečo spektroskopijo s Fourierjevo transformacijo FTIR, N2 adsorpcioa BET, termogravimetrično analizo (TGA) in diferenčno dinamično kalorimetrijo (DSC). S programom Scientist od MicroMath in ob uporabi Langmuir-Hinshelwood-Hougen-Watson-ovega modela (LHHW) ter Arrhenius-ove zveze smo določili kinetične parametre preiskovanega sistema: konstante proizvodnosti, aktivacijske energije in pred-eksponentne faktorje. Potrdili smo znano dejstvo, da presnove naraščajo s časom, kakor tudi, da presnova narašča hitreje, ko željena reakcija poteka pri višjih temperaturah. Zaznali smo, da presnova narašča hitreje pri tistih reakcijah, katere so imele na nosilec TiO2 več vezanega AlCl3. Iz rezultatov naših raziskav razberemo, da so bila na katalizatorju prisotna šibka kislinska mesta in da se je ob ponovni uporabi aktivnost katalizatorja močno zmanjšala. Prisotnost šibkih vezi v katalizatorju je bila potrjena z analizo TPD. V nadaljevanju smo ugotovili, da se aktivacijska energija preučevane reakcije zmanjšuje z večanjem mase AlCl3 na katalizatorju. Večjo aktivnost smo dosegli z bolj grobo zrnatim TiO2, manj primeren nosilec je bil fino zrnat oz. nano zrnat TiO2. Iz rezultatov analize BET smo lahko sklepali, da imajo naši katalizatorji majhno poroznost.
Keywords:katalizator, TiO2, metil miristat, miristinska kislina, kinetika, Langmuir-Hinshelwood-Hougen-Watson kinetični model
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[M. Ćeranić]
Year of publishing:2022
Number of pages:1 spletni vir (1 datoteka PDF (XIII, 63 f.))
PID:20.500.12556/DKUM-81338 New window
UDC:66.097.3-039.63(043.2)
COBISS.SI-ID:118440451 New window
Publication date in DKUM:26.07.2022
Views:878
Downloads:103
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share



Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

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:04.03.2022

Secondary language

Language:English
Title:Catalytic efficiency of metal catalysts on conventional TiO2 supports
Abstract:In the master’s thesis we synthesised the catalysts on the TiO2 base with active salt AlCl3. These catalysts were active and consequently suitable for reaction between methanol and myristic acid. Synthesised catalysts had different mass relations between TiO2 and AlCl3. Catalysts were prepared by the process of wet impregnation, by binding AlCl3 on the carrier TiO2. The effectiveness of the catalyst was controlled on the reaction of esterification of myristic acid with methanol in reactor system EasyMax 102. The Reaction was performed in small reactors, similar to slightly larger test tubes, which were able to be closed with a lid. Reactions were performed with various masses of synthesised catalyst, m = (0,05, 0,075, 0,1, 0,2, 0,3 and 0,4) g. Then we prepared a solution containing 0,15 g of myristic acid, which was then dissolved in methanol and then filled it to the mark in 10 mL flask. Samples were taken from reactor system in different time intervals t = (¼, ½, ¾, 1, 1,5, 2, 3, 4 in 5) h. After the conclusion of measurements, the samples were analysed on the HPLC machine with the UV-VIS detector. For the characterisation of the catalysts, we used the temperature programmed desorption (TPD), infrared spectroscopy with Fourier transformation FTIR, N2 absorption BET, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). By the usage of the program Scientist by MicroMath and by usage of Langmuir-Hinshelwood-Hougen-Watson model (LHHW) and Arrhenius bond we determined the kinetic parameters of the researched system: the constants of productivity, activation energy and pre-exponent factors. We confirmed the known fact that metabolisms increase with time and that metabolism increases faster when the desired reaction is performed at the higher temperatures. We found that metabolism increases faster in the reactions, which had more AlCl3 bound to the carrier TiO2. From the results of our research, we can find out that on the catalyst there were weak acid spots and that after repeated use the activity of the catalyst was strongly reduced. The presence of weaker bonds in the catalyst was confirmed by the TPD analysis. Furthermore, we discovered that the activation energy of the researched reaction decreases by the increase of AlCl3 mass on the catalyst. Increased activity was achieved by usage of more granulated TiO2, less suitable was finely granulated or nano granulated TiO2. From the results of the BET analysis, we could conclude that our catalysts have a relatively small porosity.
Keywords:catalyst, TiO2, myristic acid, methyl myristate, kinetics, Langmuir-Hinshelwood-Hougen-Watson kinetic model


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica