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Poster De Conférence Année : 2016

Unraveling the macromolecules formation mechanism during bio-oil catalytic hydroconversion

M. Ozagac
  • Fonction : Auteur
C. Bertino-Ghera
  • Fonction : Auteur
D. Uzio
  • Fonction : Auteur

Résumé

One of the thermochemical liquefaction processes used to transform lignocellulosic biomass into liquid is flash pyrolysis1,2. However, the obtained bio-oils have limited end-user application due to their thermal instability, low heat capacity and immiscibility with hydrocarbons resulting from high oxygen content. A promising upgrading process is the catalytic hydroconversion that performs a significant oxygen removal before any downstream conventional refining process. Several literature studies3,4 show the occurrence of competitive reactions such as polymerization, condensation or oligomerization. Some recent papers5,6 highlight the positive effect of alcohol or aromatic components that are supposed either to react with precursors of macromolecules or to act as hydrogen-donor solvent. To get an insight of involved mechanisms, the conversion of model molecules representative of bio-oils were studied1,7. However, because of the high diversity of oxygenated compounds in a bio-oil, it appears to be mandatory to consider at least a mixture of representative compounds. Few works7,8 were proposed so far on this concept. In addition, none of those experimental studies complied with the comprehension of the high molecular compounds production. The main objective of this study was thus to identify and understand physico-chemical phenomena that occur during the catalytic hydroconversion of model compounds of bio oils, and more specifically to establish the competition between deoxygenation and side-reactions. Investigated model compounds, representative of bio oil composition, were D-glucose in water, furfural, acetic acid and guaiacol. Through a gradual reactant addition in the studied mixtures using multiple original analytical strategies of liquid and solid effluents based on various techniques (i.e. SEC, NMR, GC, HPLC, etc.), this study particularly focuses on the competition between the formation of undesired high molecular compounds and the desired catalytic reactions.
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Dates et versions

hal-01364545 , version 1 (12-09-2016)

Identifiants

  • HAL Id : hal-01364545 , version 1

Citer

M. Ozagac, C. Bertino-Ghera, D. Uzio, D. Laurenti, C. Geantet. Unraveling the macromolecules formation mechanism during bio-oil catalytic hydroconversion. CCESC 2016, Sep 2016, Madrid Spain. ⟨hal-01364545⟩
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