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Hydrodeoxygenation of Pyrolysis Oil: Comparing an Iron-based Catalyst with Dolomite
KTH, School of Chemical Science and Engineering (CHE).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Hydrodeoxygenering av pyrolysolja: En jämförelse mellan järnbaserad katalysator och dolomit (Swedish)
Abstract [en]

This thesis evaluates the possibility to use a iron-based catalyst as a pyrolysis vapour conversion

catalyst. The iron catalyst was also compared with the mineral dolomite. The experiments

were facilitated at Cortus Energy's demonstration plant in Koping, Sweden, by in situ instal-

lation of the experimental setup to an outlet of the pyrolyser unit.

The pyrolysis vapour from Cortus Energy was converted for a total of 8 hours by passing it

through a packed bed reactor containing the iron-based catalyst while sampling gas and oil

from the feed for analysis. The outset for the operation on the dolomite catalyst bed was the

same as for the iron catalyst with a resulting collapse of the bed when the pyrolysis vapour was

introduced. The permanent gases were analysed on site with a µ-GC unit while oil samples

were condensed and analysed with GC-MS, H-NMR and Karl Ficher titration. The carbon

laydown and surface area of the catalyst was determined as well as the phase changes of the

catalyst surface with XRD. The results showed clear indications of bio-crude conversion with an eightfold increase of the

H2 concentration of the synthetic gas from 3.38 % to 26.69 % on a dry gas basis. The oxygen

to carbon (O:C) ratio decreased in the treated pyrolysis oil compared to the untreated oil while

the hydrogen to carbon (H:C) ratio showed indications of dehydration of the oil. The gas and

water content of the stream increased while 57.2 % of the oil was converted in the process.

Lastly, the iron-based catalyst did not seem to favour the conversion of alkylated phenols.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Biomass, bio-oil, bio-crude, hydrodeoxygenation, pyrolysis and tar cracking.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217791OAI: oai:DiVA.org:kth-217791DiVA, id: diva2:1157552
Available from: 2017-11-16 Created: 2017-11-16 Last updated: 2017-11-16Bibliographically approved

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