Upgrading of low-boiling fraction of bio-oil in supercritical methanol and reaction network |
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Authors: | Li Wang Pan Chunyan Zhang Qijun Liu Zhen Peng Jun Chen Ping Lou Hui Zheng Xiaoming |
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Institution: | Institute of Catalysis, Department of Chemistry, Zhejiang University, 148 Tianmushan Road, Hangzhou 310028, PR China |
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Abstract: | 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/Al2(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. |
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Keywords: | Bio-oil Low-boiling fraction Upgrading Supercritical methanol Model reactions |
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