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Influence of feedstock, catalyst, pyrolysis and hydrotreatment temperature on the composition of upgraded oils from intermediate pyrolysis

Boscagli, Chiara 1; Tomasi Morgano, Marco 2; Raffelt, Klaus 1; Leibold, Hans 2; Grunwaldt, Jan-Dierk ORCID iD icon 1,3
1 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie (ITC), Karlsruher Institut für Technologie (KIT)
3 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)


Hydrodeoxygenation (HDO) of bio-oils obtained from intermediate pyrolysis with hot vapor filtration was investigated over Ru/C and NiCu/Al2O3 catalysts as a function of several parameters: feedstock (beech wood, wheat straw), pyrolysis temperature, catalyst and hydrotreatment temperature. Beech wood was found to be a suitable feedstock for HDO due to its low heteroatom content, whereas the high sulfur content in the wheat straw bio-oil caused irreversible poisoning of the catalysts. Ru/C generally consumed more hydrogen than NiCu/Al2O3, showing higher hydrogenation/HDO activity with higher selectivity towards alcohols and hydrocarbons, whereas NiCu/Al2O3 resulted in a higher concentration of ketones. The pyrolysis temperature affected the fragmentation degree; higher temperatures resulted in a higher quality pyrolysis oil with low oxygen mass fraction, but with decreased mass yield. By varying the hydrotreatment temperature (80, 150, 250, 350 °C), different classes of compounds were converted and different deoxygenation degrees were achieved. Overall the results indicate that intermediate pyrolysis with hot vapor filtration is a valid alternative to the more commonly used fast pyrolysis for decentralized (or small-scale) applications, especially for heterogeneous feedstocks with high ash content.

Verlagsausgabe §
DOI: 10.5445/IR/1000084357
Veröffentlicht am 10.07.2018
DOI: 10.1016/j.biombioe.2018.06.022
Zitationen: 32
Web of Science
Zitationen: 24
Zitationen: 39
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie (ITC)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2018
Sprache Englisch
Identifikator ISSN: 0961-9534
KITopen-ID: 1000084357
HGF-Programm 34.14.01 (POF III, LK 01) Pyrolyse
Erschienen in Biomass and bioenergy
Verlag Elsevier
Band 116
Seiten 236–248
Nachgewiesen in Web of Science
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