Sammendrag
In view of the rising demand for fossil fuel feedstocks and the limited amount of natural resources, renewable sources are urgently needed. Hydrocarbons and aromatics from lignin seem to be a very promising solution. Lignocellulosic biomass is typically available as an industrial residue or side product.For valorisation of lignin the complex natural polymer has to be converted. Depolymerization processes have been described in literature but are still challenging. Another difficulty is that aromatics and hydrocarbons derived from lignin are rich in oxygen which is disadvantageous in terms of stability and heating value.[2]In order to use those compounds for high grade fuels, catalytic upgrading e.g.via hydrodeoxygenation (HDO) is necessary.[4]In this study, HDO of 4-cyclohexylphenol with niobium oxide-supported iridium particles(Ir@Nb2O5)is conducted and reaction parameters are optimised. To minimise the hydrogen consumption and obtain higher octane values, a selectivity towards aromatics is of interest.[5]Moreover, a first attempt to remove acidic sites on the oxide support is conducted.
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