Repolymerization has been a subject of intense research during the storage and catalytic hydrotreatment of biomass pyrolysis liquid (PL). Herein, to understand the influence of reaction parameters on repolymerization, Ni/SiO catalyst, synthesized by the method of deposition-precipitation, has been used in the mild hydrotreatment of PL model compounds (hydroxyacetone, furfural and phenol). Reaction parameters including temperature and hydrogen pressure were studied in detail, and reaction routes were summarized. As result, the temperature of 180 degree centigrade and relatively high hydrogen pressure would suppress the repolymerization product formation. Hydrotreatment of mixed model compounds has also been conducted to simulate the PL more factually, in which influence of temperature and mixing condition were studied. Reaction rate of hydroxyacetone and phenol were inhibited in the mixed model compounds hydrotreatment, especially for phenol, whose conversion was almost zero in the first 7 hours. Based on the results of conversion over time and the characterization of the catalyst used in different model compound hydrotreatment, competitive adsorption among the three models as well as the formation of carbonaceous species and oligomers should all be responsible for the inhibitory effect in the mixed model compounds hydrotreatment. Since there was no obvious stable carbon deposition on the used catalyst, mild catalytic hydrotreatment did inhibit its formation.

Stabilization of fast pyrolysis liquids from biomass by mild catalytic hydrotreatment: Model compound study

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.