20.500.12556/DKUM-90216-a8746398-5422-2a70-68e5-c0a03dbb9d8b Sinteza in karakterizacija katalizatorjev na osnovi mezoporozne silike Synthesis and characterization of catalysts based on mesoporous silica Namen diplomskega dela je bil sintetizirati in okarakterizirati kislinske katalizatorje na osnovi mezoporozne silike MCM-41 in SBA-15. Na siliko smo z metodo mokre impregnacije vezali Al³⁺ in Ni²⁺ ione, ter učinkovitost katalizatorjev preverjali z modelno reakcijo esterifikacije miristinske kisline v metil miristat, kjer smo največjo presnovo dosegli s katalizatorjem Al-SBA-15. Sintetizirane katalizatorje smo okarakterizirali z Brunauer-Emmett-Tellerjevo metodo, dinamičnim sipanjem svetlobe, diferenčno dinamično kalorimetrijo, infrardečo spektroskopijo s Fourierjevo transformacijo, vrstično elektronsko mikroskopijo in NH3 temperaturno programirano desorpcijo. Na osnovi rezultatov karakterizacije sklepamo na prisotnost Si-O-Si in Si-OH skupin ter prisotnost močnih in šibkih kislinskih mest. V povprečju je bila specifična površina katalizatorjev na osnovi MCM-41 914,6 m2 g-1, povprečna velikost delcev 300,6 nm, specifična površina katalizatorjev na osnovi SBA-15 pa 664,6 m2 g-1 ter velikost delcev 1092,0 nm. The purpose of thesis was synthesis and characterization of acid catalysts based on mesoporous silicas MCM-41 and SBA-15. The silica was functionalized with Al³⁺ and Ni²⁺ ions using the wet impregnation method. The efficiency of the catalysts was checked using a model esterification reaction of myristic acid into methyl myristate, where the highest conversion was achieved with the Al-SBA-15 catalyst. The synthesized catalysts were characterized using Brunauer-Emmett-Teller method, dynamic light scattering, differential scanning calorimetry, Fourier-transform infrared spectroscopy, scanning electron microscopy, and NH3 temperature-programmed desorption. methods. The characterization results confirmed the presence of Si-O-Si and Si-OH groups in the material and the presence of strong and weak acidic sites for the binding of active groups. On average, the specific surface area of MCM-41-based catalysts was 914,6 m² g-1, with an average particle size of 300,6 nm, while the surface area measured for SBA-15-based catalysts was 664,7 m² g-1 with a particle size of 960,2 nm. mezoporozna silika MCM-41 SBA-15 heterogena kataliza esterifikacija miristinske kisline mesoporous silica MCM-41 SBA-15 heterogeneous catalysis esterification of myristic acid true true false [K. Zavrl] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-08-26 14:33:16 2024-09-04 08:53:58 2024-11-13 14:17:42 0000-00-00 00:00:00 2024 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.091.3:546.284-44(043.2) 213680387 VS_Zavrl_Katarina_2024.pdf VS_Zavrl_Katarina_2024.pdf 1 9084E587175091FC56E7895062562F61 b8d471525abb675c8893bfc8ac9189ea155126807f9fca18b9712ff5264e98a8 74f8ce3d-69ff-11ef-af22-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=184263 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0