This
study describes tar conversion on olivine in fluidized-bed gasification
conditions. A laboratory-scale reactor (Aligator) was used to characterize
phenol conversion to higher tars, before adding a sand and olivine
bed to investigate heterogeneous steam reforming and the cokefaction
of these tars. H2 and H2O atmospheres were tested
both separately and together to characterize tar conversion on olivine.
Catalytic activity in steam reforming was shown to be much improved
by the presence of H2. In the absence of H2O
in the reactive atmosphere, olivine caused a high cokefaction of tars.
With 10% H2O and 20% H2, olivine became highly
active in steam reforming of tars. Carbon deposition on the catalysts
was quantified by temperature-programmed oxidation (TPO), and optical
photographs of olivine were taken after tar conversion.
Interactions between char and tar during the steam gasification in a fluidized bed reactor. (2018) Fuel, 224. 600-609. ISSN 00162361 Official URL: https://doi.
This study focused on the effect of a wood char on tar cracking and reforming in the context of fluidized-bed gasification. Phenol was used to create in situ a mixture representative of tars produced by pyrolysis and gasification in a dual fluidized-bed reactor. The wood char was placed in a fixed-bed reactor, and atmospheres composed of H2 and steam were tested both together and separately. Gasification of the wood char under the different atmospheres was characterized. The char was found to be highly catalytic with tars in the presence of steam. The influence of H2 on catalytic activity remained low. A comparison to the results on olivine under the same reaction conditions showed that chars were much more efficient and may have a strong influence on tar reduction in fluidized-bed biomass gasification. (Résumé d'auteur
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 P P / , the iron is reduced to form native iron (Fe 0) on the olivine surface which favors the steam reforming of toluene.
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