Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (7): 1398.

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Phenolic Model Reactions with Olefin for Bio-oil Upgrading over Solid Acid Catalyst

YANG Xu-Lai1, Charles U. Pittman, Jr.2, ZHU Xi-Feng1*   

  1. 1. Key Laboratory for Biomass Clean Energy of Anhui Province, University of Science and Technology of China, Hefei 230026, China;
    2. Department of Chemistry, Mississippi State University, Mississippi 39762, USA
  • Received:2009-11-25 Online:2010-07-10 Published:2010-07-10
  • Contact: ZHU Xi-Feng. E-mail: xfzhu@ustc.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50876099, 50930006)、国家科技支撑计划(批准号: 2007BAD34B02)和中国科学院知识创 新工程(批准号: KGCX2-YW-330)资助.

Abstract:

Model liquid phase reactions of 1-octene with phenol, catechol and guaiacol, respectively, were carried out over acid catalyst 30%Cs2.5H0.5PW12O40/K-10 for bio-oil upgrading. 1-Octene alkylation of phenol was selected to determine the catalyst loading, upgrading temperature and molar ratio of feedstock. The catalyst was very active and extremely selective for phenol alkylation at 60—100 ℃. The selectivity for O-alkylated phenol was highest when the phenol/1-octene mole ratio is 1∶1. Steric hindrance by methoxy group on the ortho-position relative to the —OH in guaiacol can dramatically reduce conversion and O-alkylation selectivity. The main product of catechol alkylation with 1-octene in the experimental conditions was mono-O-alkylation product, the selectivity was as high as 96% even at 100 ℃. All phenolic compound conversions increased substantially with increasing temperature, however, O-alkylation selectivity dropped progressively as temperature increased.

Key words: Olefin; Bio-oil upgrading; Phenolic compound; Heteropoly acid catalyst

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