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Renewable phenols and fuel production from catalytic pyrolysis of lignin using microwave irradiation heating

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131594593,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131594593) @2013
Authors:   Quan Bu, Hanwu Lei, Lu Wang, Juming Tang
Keywords:   lignin catalytic pyrolysis phenols kinetics reaction mechanism

Abstract. The aim of this study is to explore catalytic microwave pyrolysis of lignin for renewable phenols and fuels due to the abundant availability and characteristics of the chemical structure of lignin. A central composite experimental design (CCD) was used to optimize the reaction condition of this process. The effects of reaction temperature and ratio of catalyst to lignin on product yields were investigated. GC/MS analysis showed that the main chemical compounds of bio-oils were phenols, guaiacols, hydrocarbons and esters, most of which ranged from 71-87% of the bio-oils depending on different reaction conditions. Bio-oils with high concentrations of phenol (45% in the bio-oil) were obtained. The calorific value analysis revealed that the high heating values (HHV) of the lignin-derived biochars were from 20.4−24.5MJ/kg, about 3−24% increase compared to HHV of raw lignin. The thermal decomposition behaviors of lignin pyrolysis were studied by thermogravimetric analysis (TGA), and the kinetic parameters were investigated using thermogrametric analysis (TGA) data. The reaction mechanism of this process was analyzed.

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