Quantitative Investigation of Free Radicals in Bio-Oil and their Potential Role in Condensed-Phase Polymerization

被引：61
|
作者：
Kim, Kwang Ho [1 ,2 ]
Bai, Xianglan [1 ]
Cady, Sarah [3 ]
Gable, Preston [1 ]
Brown, Robert C. [1 ]
机构：
[1] Iowa State Univ, Bioecon Inst, Biorenewables Res Lab 1140E, Ames, IA 50010 USA
[2] Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50010 USA
[3] Iowa State Univ, Dept Chem, Ames, IA 50010 USA
来源：
CHEMSUSCHEM | 2015年 / 8卷 / 05期
基金：
美国国家科学基金会;
关键词：
biomass; cleavage reactions; epr spectroscopy; polymerization; radicals; ELECTRON-PARAMAGNETIC-RESONANCE; STABLE FREE RADICALS; FAST PYROLYSIS; MOLECULAR PRODUCTS; VACUUM PYROLYSIS; PART I; LIGNIN; MECHANISMS; CELLULOSE; COAL;
D O I：
10.1002/cssc.201403275
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report on the quantitative analysis of free radicals in bio-oils produced from pyrolysis of cellulose, organosolv lignin, and corn stover by EPR spectroscopy. Also, we investigated their potential role in condensed-phase polymerization. Bio-oils produced from lignin and cellulose show clear evidence of homolytic cleavage reactions during pyrolysis that produce free radicals. The concentration of free radicals in lignin bio-oil was 7.5x10(20)sping(-1), which was 375 and 138times higher than free-radical concentrations in bio-oil from cellulose and corn stover. Pyrolytic lignin had the highest concentration in free radicals, which could be a combination of carbon-centered (benzyl radicals) and oxygen-centered (phenoxy radicals) organic species because they are delocalized in a system. Free-radical concentrations did not change during accelerated aging tests despite increases in molecular weight of bio-oils, suggesting that free radicals in condensed bio-oils are stable.
引用
收藏
页码：894 / 900
页数：7
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