20.500.12556/RUL-186933 S trdnimi sorbenti izboljšana termokemijska katalitska pretvorba ogljikovega dioksida v obnovljiva letalska goriva Thermochemical catalytic conversion of carbon dioxide into sustainable aviation fuels Diplomsko delo obravnava neposredno termokemijsko katalitsko pretvorbo CO₂ z vodikom v vmesne produkte, ki bi jih bilo mogoče nadalje uporabiti pri proizvodnji trajnostnih oziroma obnovljivih letalskih goriv. Namen dela je bil raziskati vpliv temperature na pretvorbo CO₂ in porazdelitev nastalih produktov. Sintetizirali smo katalizator z natrijem promoviranega sistema baker–železo (Na–CuFe) in ga uporabili skupaj s komercialnim 5 mas. % Cu/H-ZSM-5 v kontinuirnem pretočnem reaktorju s strnjenim slojem. Reakcije smo izvedli pri 270, 300, 330 in 360 °C ter konstantnem tlaku 20 bar. Plinasto fazo smo analizirali z mikro-GC, tekočo pa z GC–MS. Opazili smo, da je konverzija CO₂ naraščala do 330 °C, kjer je dosegla 36,04 %, pri 360 °C pa se je nekoliko zmanjšala. Najvišji molski delež CO smo dobili pri 330 °C, kar kaže na izrazit prispevek obratne reakcije premika vodnega plina (RWGS), medtem ko sta se pri višjih temperaturah značilno povečala molski delež in selektivnost metana. V tekočih vzorcih smo zaznali več kisikovih spojin, med drugim metanol, v vzorcu iz poznejše faze zaporednega eksperimenta pa sta bila tentativno identificirana tudi etanol in metil acetat. Ker sta bila temperaturna koraka pri 330 in 360 °C izvedena zaporedno, vpliva temperature pri teh dveh pogojih ni mogoče popolnoma ločiti od vpliva časa delovanja. Med preučevanimi pogoji je bila na podlagi rezultatov plinaste faze najbolj obetavna temperatura 330 °C. Nadaljnja optimizacija procesnih parametrov, kot so višji tlak, hitrost plina in razmerje CO₂/H₂, bi lahko povečala pretvorbo CO₂ in izkoristek tekočih produktov v ogljikovodikovi frakciji za proizvodnjo SAF. Prilagajanje razmerja Cu/Fe v katalizatorjih lahko vpliva na aktivnost Fischer–Tropscheve sinteze ter izboljša selektivnost za želeni produkt. Produktov, ki bi jih lahko neposredno opredelili kot SAF, nismo zaznali. This bachelor's thesis investigates the direct thermochemical catalytic conversion of CO₂ with hydrogen into intermediate products that could subsequently be used in the production of sustainable or renewable aviation fuels. The aim was to investigate the effect of temperature on CO₂ conversion and product distribution. A sodium-promoted copper–iron (Na–CuFe) catalyst was synthesised and used together with a commercial 5 wt.% Cu/H-ZSM-5 catalyst in a continuous packed-bed flow reactor. Reactions were carried out at 270, 300, 330 and 360 °C at a constant pressure of 20 bar. The gas phase was analysed by micro-GC and the liquid phase by GC–MS. CO₂ conversion increased with increasing temperature, reaching 36.04% at 330 °C, and decreased slightly at 360 °C. The highest CO mole fraction was measured at 330 °C, indicating a pronounced reverse water–gas shift (RWGS) contribution, while methane mole fraction and selectivity increased markedly at the higher temperatures. Several oxygenated compounds were detected in the liquid samples, including methanol, while ethanol and methyl acetate were tentatively identified in the sample collected during the later stage of the sequential experiment. Because the temperature stages at 330 and 360 °C were performed sequentially, the effect of temperature at these two conditions cannot be fully separated from time-on-stream effects. Based mainly on the gas-phase results, 330 °C was the most promising among the investigated conditions. Further optimisation of process parameters, such as higher pressure, gas velocity, and the CO₂/H₂ ratio, could increase CO₂ conversion and the yield of liquid products in the hydrocarbon fraction relevant to SAF production. Tuning the Cu/Fe ratio in the catalyst could influence Fischer–Tropsch activity and improve selectivity towards the desired products. No products that could be directly classified as SAF were detected. katalitska hidrogenacija ogljikov dioksid reakcija RWGS trajnostna letalska goriva Na–CuFe katalizator catalytic hydrogenation carbon dioxide RWGS reaction sustainable aviation fuels Na–CuFe catalyst true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-07 12:25:03 2026-09-07 12:25:16 2026-09-08 04:19:39 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 26190 Kastelic_Mia_-_S_trdnimi_sorbenti_izboljsana_termokemijska_katalitska_pretvorba_ogljikovega_diok.pdf Kastelic_Mia_-_S_trdnimi_sorbenti_izboljsana_termokemijska_katalitska_pretvorba_ogljikovega_diok.pdf 1 56E65FF1844D1001C5A4A1655E77DE36 7ef4d39d566eb8ae3680b7f444fdfd05bdfab31a226443d62e9e6ae78602ede6 6806b03c-aaa6-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246328 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0