Impact of guaiacol on the formation of undesired macromolecules during catalytic hydroconversion of bio-oil: a model compounds study - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue Biomass and Bioenergy Année : 2016

Impact of guaiacol on the formation of undesired macromolecules during catalytic hydroconversion of bio-oil: a model compounds study

Résumé

Although catalytic hydroconversion of pyrolysis bio-oils has been studied for many years, side reactions such as condensation or oligomerization leading to high molecular weight compounds still need comprehensive studies. In this work, the catalytic hydroconversion of D-glucose, furfural, acetic acid and guaiacol representative of pyrolysis bio-oils was investigated separately before testing a 5-component mixture. Thanks to a detailed analytical strategy (i.e. SEC, 13C NMR, GC, HPLC), this paper focuses on the effect of guaiacol conversion on sugar-like macromolecules. The study of single D-glucose and furfural revealed the fast production of high molecular weight compounds (up to 700 g.mol-1) that were proven to further precipitate (from D-glucose). Guaiacol addition led to a decrease of the solid production through solubilizing and/or reacting with macromolecules. This phenomenon produced larger soluble macromolecules (up to 5.000 g.mol-1). Results show that guaiacol and its hydroconversion products formed soluble macromolecules at short reaction times and low temperatures. Response to Reviewers: Reviewer #1: The author tried to investigate the mechanism on coke formation during catalytic hydrotreatment. It is an important topic to study. The role guaiacol plays during this process has been highlighted. And it is interesting to see that the presence of guaiacol can actually reduce the coke formation according to the model compounds mixtures. However, no oligomeric compounds derived from lignin was incorporated, which may make the research less persuasive in term of better simulation of bio-oil. Coke can be also derived from pyrolytic lignin in bio-oil. It will be more interesting to the interaction between pyrolytic lignin and those model compounds including glucose, furfural, and acetic acid. Response: Our initial aim was to provide a comprehensive study of the catalytic hydroconversion of light commercial compounds. Following your remark, we include the reference [20] dealing with the characterization of oligomeric lignin compounds forming macromolecules present in the bio-oil (referred as pyrolytic lignin). Model reaction was undertaken with
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Dates et versions

hal-01487875 , version 1 (13-03-2017)
hal-01487875 , version 2 (10-10-2017)

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Matthieu Ozagac, Céline Bertino-Ghera, Denis Uzio, Mickael Rivallan, Dorothée Laurenti, et al.. Impact of guaiacol on the formation of undesired macromolecules during catalytic hydroconversion of bio-oil: a model compounds study. Biomass and Bioenergy, 2016, 95, pp.194-205. ⟨10.1016/j.biombioe.2016.09.022⟩. ⟨hal-01487875v1⟩
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