Disputation
Due to the ongoing Pandemic, the Disputation will be held digital using Zoom. The Chair of Defence will lead the Disputation and the Defence technician will solve technical issues.
Ex auditorio questions: The Chair of Defence will invite the audience to ex auditorio questions. These can be asked orally, by clicking "Participants - Raise hand" in the Zoom menu. The Zoom-host will grant you to speak in the meeting.
Order the Dissertation as PDF from this email address. Please add name of Candidate: a.c.gartner@kjemi.uio.no
Trial lecture
20th. of May 2021 at 10.30 AM, Zoom
Title:"Tandem catalysts for the direct CO2 hydrogenation to liquid fuels"
Conferral summary
Effektiv foredling av eten til lengre hydrokarbonkjeder ved bruk av heterogene katalysatorer kan ha betydelige miljømessige fordeler og kan bidra til å løse utfordringer innenfor bærekraftig produksjon av kjemikalier. I denne avhandlingen har nikkel-holdige materialer blitt undersøkt som katalysator for direkte omdanning av eten til lengre hydrokarbonkjeder. Dette arbeidet gir innsikt i egenskapene til katalysatorene, sammenhengen mellom deres egenskaper og ytelse, og i mekanismen bak reaksjonen.
Main research findings
The selective oligomerization of ethene to linear alpha olefins is an attractive method for production of a wide range of key intermediates for the chemical industry. Current industrial processes are predominantly utilizing homogenous metal catalysts with a cocatalyst in organic solvents. Heterogeneous catalysts potentially offer a more environmentally friendly alternative and significant effort, both in academia and industry, has been put into the development of heterogeneous catalysts for the ethene oligomerization reaction.
In this thesis, nickel functionalized zeolites, silica, and metal-organic framework (MOF) catalysts have been investigated for the cocatalyst free ethene oligomerization reaction. Zeolites and MOFs are porous materials with a wide range of potential use and have numerous applications in catalysis. Different zeolites and MOFs have been investigated to understand the nature of the active site, reaction mechanism and the role of the support in the reaction. This thesis provides insights into role of the zeolites in the reaction and the dynamic nature of the nickel active site during the reaction. Kinetic, spectroscopic, and theoretical methods elucidate the nature of active and spectator nickel species in Ni-MOFs and opens new research opportunities to develop cocatalyst free MOF catalyst.