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Gas Phase Alkali Effects on Tar Reforming Activity in Biomass Gasification Application
KTH, School of Chemical Science and Engineering (CHE).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This experimental report concern effects of gas phase alkali on tar reforming activity under

realistic operation conditions. Synthesis gas was produced with the aid of a 5 kW fluidized bed

gasifier, using pine pellets as feedstock. Earlier studies in the field have been focusing on predoped

potassium (K) as promoter. In the present study, adsorption and desorption of K on pretreated

commercial nickel-catalyst (Ni-MgAl2O4) manufactured by Haldor Topsøe A/S has

been performed. Alkali was added continuously to the dust free gas through an aerosol

generator, providing a constant K feed. Improvement of the setup has been done to facilitate the

sample taking, including a cleaning section. Characterization of the catalyst has been performed

throughout the process, which aims to study the crucial effects of catalyst activity changes. The

catalyst activity has been investigated by means of its ability to reform naphthalene and

methane. Both conversions increased with increasing potassium content on the catalyst surface

until a stable plateau, where equilibrium was reached. Also when removing potassium from the

catalyst, a decrease in methane conversion was observed.

Place, publisher, year, edition, pages
2016. , 22 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-187476OAI: oai:DiVA.org:kth-187476DiVA: diva2:930492
Available from: 2017-06-29 Created: 2016-05-24 Last updated: 2017-06-29Bibliographically approved

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