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Tar conversion over olivine and sand in a fluidized bed reactor using toluene as model compound

Morin, Mathieu and Nitsch, Xavier and Pécate, Sébastien and Hemati, Mehrdji Tar conversion over olivine and sand in a fluidized bed reactor using toluene as model compound. (2017) Fuel, 209. 25-34. ISSN 0016-2361

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Official URL: http://doi.org/10.1016/j.fuel.2017.07.084

Abstract

The aim of this work is to study the tars conversion in conditions representative of biomass gasification in a fluidized bed reactor. Experiments are conducted at 850 °C and atmospheric pressure in a fluidized bed reactor with toluene as tar model. Influences of the nature of the media (sand and olivine) and of the reactive atmosphere (steam and hydrogen partial pressures) on toluene conversion are particularly studied. The steam and hydrogen partial pressures were varied in the range of 0.05 to 0.4 bars and 0 to 0.2 bars, respectively. Results showed a strong influence of these parameters on toluene conversion. Olivine was found to have a catalytic activity towards steam reforming reactions which depends on the ratio in the reactor. Both thermodynamic equilibrium and surface analyses (EDX and XRD) of olivine particles suggested that this ratio controls the oxidation/reduction of iron at the olivine surface. Besides, iron is more active towards tars removal when its oxidation state is low. At 850 °C and , the iron is reduced to form native iron (Fe0) on the olivine surface which favors the steam reforming of toluene.

Item Type:Article
HAL Id:hal-01840800
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:16 Jul 2018 14:49

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