dc.contributor.advisor | Gautun, Odd Reidar | |
dc.contributor.author | Sakariassen, Sivert | |
dc.date.accessioned | 2023-06-14T17:19:47Z | |
dc.date.available | 2023-06-14T17:19:47Z | |
dc.date.issued | 2023 | |
dc.identifier | no.ntnu:inspera:146699659:64402662 | |
dc.identifier.uri | https://hdl.handle.net/11250/3071416 | |
dc.description.abstract | Fiksering av CO2 for å produsere nyttige kjemikalier har blitt studert lenge. Spesielt syntesen av
sykliske karbonater fra CO2 og epoksider har blitt utforsket. Denne raporten har foksuert på to
forskjellige katalysatorer og deres potensial for å katalysere sykliske karbonat synteser. En av disse
er ionsik væske (IL) katalysatorer og den andre er metal holdige hetrogene katalysatorer. For god
selektivitet og utbytte må reaksjonen gjennomføres ved 3 Mpa CO2 og 140 °C. IL katalysatorene
har et anion som promoterer reaksjonen og reaksjonsraten øker med anionets nukleofilisitet. Reak-
sjonshastigheten er høyere med IL katalyster enn metalliske. IL katalysetorer taper mer katalyst
når de regenereres og krever mer energi for hver syklus. Det finnes måter å redusere tap av katalyst
og energi for å gjøre de mer like. Totalt sett er IL katalysatorer mer lovende siden de har høyere
reaktivitet enn metalliske. | |
dc.description.abstract | The fixation of CO2 to produce useful chemicals has been studied for a long time. Particularly the
synthesis of cyclic carbonates from CO2 and epoxides has been studied extensively. This report has
looked at two different types of catalysts and their potential for catalysing the synthesis of cyclic
carbonbates. One is ionic liquids (IL) and the other is metal containing heterogeneous catalysts.
For good selectivity and yield, the reaction should proceed at a pressure of 3 Mpa of CO2 at
140 °C. The IL catalysts have an anion to promote the reaction and the rate of the reaction
increases with nucleophilicity. The reaction speed is higher with IL catalysts than the metallic
ones. IL catalysts lose more catalyst when it is regenerated and requires more energy per cycle to
separate the product and regenerate the catalyst than metal heterogeneous catalysts. There are
ways to mitigate loss and energy consumption to make them more similar. In total IL catalysts
due to their higher reactivity seem more promising than metallic catalysts. | |
dc.language | eng | |
dc.publisher | NTNU | |
dc.title | Comparison of the catalytic potential of ionic liquids and heterogeneous metallic catalysts to prepare cyclic carbonates from carbon dioxide and epoxides | |
dc.type | Bachelor thesis | |