Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 7, Pages 4884-4889Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.01.053
Keywords
Bio-oil; Low-boiling fraction; Upgrading; Supercritical methanol; Model reactions
Funding
- National Basic Research Program [2007CB210204]
- National Natural Science Foundation of China [21073160, J0830413]
- Top Key Discipline of Zhejiang Province
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In this work, the low-boiling fraction (LBF) of bio-oil was used as feed stock. LBF is a very complex mixture, and the three groups in LBF: acids, aldehydes and phenols, are primarily responsible for deterioration in the quality. The upgrading reactions were carried out over Pt/Al-2(SiO3)(3), Pt/C or Pt/MgO in supercritical methanol. It is demonstrated that supercritical condition can greatly facilitate the esterification process, and after 6 h reaction, all the acids can be converted into esters even without adding any catalyst. The total amount of the three groups left in products was much less exhibited on Pt supported on active carbon and MgO in the presence of hydrogen. By investigating the model reactions, the relations between the representative compounds and major products were identified, and the conversion scheme of the upgrading reactions is proposed. (C) 2011 Elsevier Ltd. All rights reserved.
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